<p>Selling Points</p><ul><li>Flexible full-time work with no core hours</li><li>Remote-friendly policies and tech-forward culture</li><li>Competitive compensation, annual performance bonuses, and potential equity</li><li>Paid time off, wellness support, and skill-building allowances</li><li>The chance to shape software quality in industries that truly matter-finance and energy</li></ul><p>Company Profile</p><ul><li>We're looking for a Senior SDET to lead test automation and drive software quality across large-scale platforms in the Fintech and Energy Tech industries. You'll work on services that support millions of users or power national infrastructure, from next-generation credit platforms to energy trading marketplaces.</li><li>This is a hands-on technical leadership role where you'll build robust automation systems and directly influence engineering practices and release velocity.</li></ul><p>The Role</p><ul><li>Design and build automation frameworks for APIs, microservices, and batch job workflows</li><li>Lead automated testing across web, backend, and infrastructure layers</li><li>Drive CI/CD integration of test suites using GitLab CI, Jenkins, and Gradle</li><li>Write test cases using Java frameworks (TestNG, JUnit, AssertJ)</li><li>Generate detailed test reports using Allure; use SLF4J and logging tools for debugging</li><li>Contribute to risk validation systems, secure data pipelines, and performance assurance</li><li>Foster QA culture and introduce risk-based testing, quality metrics, and tooling improvements</li></ul><p>Your Skills</p><ul><li>5+ years of experience in QA automation or software testing</li><li>Strong coding skills in Java, and knowledge of test frameworks like JUnit, TestNG</li><li>Experience testing APIs, backend systems, or microservices (REST/gRPC)</li><li>Familiar with mocking libraries (e.g. Mockito) and API testing tools (REST Assured, Postman)</li><li>Experience integrating automation into CI/CD pipelines</li><li>Excellent communicator who collaborates well with developers and product teams</li></ul><p>Salary</p><ul><li>10,000,000 yen - 12,000,000 yen</li></ul><p>Location</p><ul><li>Tokyo</li></ul><p>Reference number : 06940-0013242907</p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/c3VlLnRpbmcuNjMyNjguMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p><strong>What Sets This Opportunity Apart</strong><br /><br /><span style="text-decoration: underline;">Mission with Real Impact</span>: Help transform financial services by making cashless payments more accessible and intuitive for everyone in Japan. Your work will drive a fundamental shift in how people interact with money.<br /><br /><span style="text-decoration: underline;">Freedom to Innovate</span>: Join a culture that rewards initiative, creative problem-solving, and the courage to challenge the status quo. Here, you'll help rebuild core systems from the ground up, not just tweak existing features.<br /><br /><span style="text-decoration: underline;">Career Growth & Ownership</span>: Take on enterprise-scale challenges, lead architectural decisions, and see your ideas move from concept to reality. You'll have a direct hand in expanding the company's service portfolio as it aims to become Japan's go-to fintech platform.<br /><br /><span style="text-decoration: underline;">Flexible Workstyle</span>: Enjoy true flexibility-work fully remotely from anywhere in Japan, with occasional team gatherings in Tokyo. There's no fixed office attendance, and you set your own hours for optimal work-life balance.<br /><br /><span style="text-decoration: underline;">Collaborative & Diverse Team</span>: Work alongside passionate engineers, product managers, and designers from around the world. Communication is open, and your input will always be valued.<br /><br /><strong>What You'll Do</strong><br />Collaborate across disciplines to deliver new features and elevate the user experience for a rapidly growing digital payments platform.<br />Redesign and enhance frontend architecture for scalability, maintainability, and future growth.<br />Tackle complex technical challenges as you help reimagine a system at the heart of Japan's fintech transformation.<br />Mentor peers, share knowledge, and uphold engineering best practices through code reviews and feedback.<br />Troubleshoot and resolve issues to ensure a secure, robust, and seamless product.<br /><br /><strong>Who Thrives Here</strong><br />Engineers with 5+ years of hands-on experience in JavaScript and/or TypeScript, and at least 2 years working with Vue.js (React also welcome).<br />Professionals who've led frontend projects and designed scalable architectures.<br />Those who prefer building products over following orders-problem solvers who want to leave their mark on a fast-evolving industry.<br />Candidates from product-driven backgrounds (rather than consulting or outsourcing) who value autonomy and ownership.<br />Business-level English is required; Japanese is a plus but not mandatory.<br /><br /><strong>Tech Stack Highlights</strong><br />Nuxt 3 (Vue.js 3, TypeScript), REST APIs, TanStack Query, Zod, Storybook<br />CI/CD with GitHub Actions, AWS S3/CloudFront/Route53<br />Modern collaboration tools: GitHub, Slack, Zoom, Miro, JIRA<br /><br /><strong>Why Now?</strong><br />Japan's tech sector is undergoing a digital revolution, with a critical shortage of skilled IT professionals and a surge in demand for those ready to lead modernization efforts. This is a rare chance to join a company with strong financial backing and a startup mindset-where you'll help set the standard for the next era of fintech in Tokyo and beyond.</p><p>Reference Number: 06940-0013246353</p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/S2hhbmcuTGUuNTI1NDEuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p><strong>Selling points</strong></p><p><Why This Role is Perfect for You></p><ul><li>Fully Remote Flexibility: Work from anywhere in Japan, with the option to join team sessions at a Tokyo office if you choose-collaboration is encouraged, never mandated.</li><li>Cutting-Edge Product: Shape the frontend for an AI Data Platform used by leading manufacturers. Your work will directly impact how industrial data is leveraged worldwide.</li><li>Modern Tech Stack: TypeScript, React, Apollo, Next.js, WebGL, WebAssembly, and more. Work with the latest tools and frameworks to solve complex, meaningful problems.</li><li>Technical Leadership: Lead technology selection, architectural decisions, and technical strategy for a rapidly scaling product and organization.</li><li>Collaborative, Global Team: Work with passionate engineers from Japan and abroad. English is the main language for many teams, and you'll be part of a diverse, supportive environment.</li><li>Real Impact: Help deliver products that change workstyles and create societal value by transforming industrial structures.</li><li>Professional Growth: Gain experience scaling products globally, solving challenging problems, and contributing to a mission-driven organization.</li></ul><p><strong>C</strong><strong>ompany Profile</strong></p><ul><li>Our client is a rapidly growing, product-driven SaaS company, recognized for revolutionizing manufacturing workflows with advanced data and machine learning.</li><li>With a multinational, engineering-centric culture and a strong Tokyo presence, you'll enjoy the freedom of full remote work anywhere in Japan, plus the option to collaborate in a modern Tokyo office for team synergy.</li></ul><p><strong>The Role</strong></p><p><What You'll Do></p><ul><li>Lead frontend architecture and technology selection for the AI Data Platform and related products.</li><li>Build sustainable, maintainable frontend applications with a focus on long-term operability.</li><li>Rapidly iterate and validate product features, collaborating closely with designers to enhance UI/UX.</li><li>Design and implement reusable UI components and standardize frontend development practices.</li><li>Evaluate and integrate new technologies, frameworks, and middleware as the team scales.</li><li>Provide technical leadership, mentor team members, and align technical strategy with business goals.</li></ul><p><strong>Y</strong><strong>our Skills</strong></p><p><What You Bring></p><ul><li>7+ years of hands-on frontend development experience for web applications.</li><li>Advanced proficiency in TypeScript and experience building reusable UI components.</li><li>Proven track record leading technology selection, requirements definition, and frontend architectural design.</li><li>Experience working with modern frameworks (React, Next.js, Apollo, etc.) and familiarity with SSR, CSR, SSG, or PWA is a plus.</li><li>Strong communication skills in English (business-level or above).</li><li>Currently residing in Japan with a valid working visa.</li><li>A mindset aligned with the mission to "unleash the potential of manufacturing," with ownership, positivity, and a collaborative, respectful approach to problem-solving.</li><li>(Preferred) Experience with large-scale service development, backend technologies (Node.js), BFF (GraphQL/Apollo), and optimizing web performance.</li><li>(Preferred) Conversational-level Japanese (N2 or above), as communication is a mix of Japanese and English.</li></ul><p><strong>Salary</strong></p><ul><li>7,000,000 yen - 10,000,000 yen</li></ul><p><strong>Location</strong></p><ul><li>Tokyo</li></ul><p>Reference number: 06940-0013211509</p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/S2hhbmcuTGUuMDg1NDkuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p><strong>Company Profile</strong></p><p>[Backend Engineer] Seeking a core member to support the growth of our enterprise SaaS product!<br />We are a leading data intelligence platform that is being adopted by major Japanese companies one after another. We are looking for a Backend Engineer to support the quality of our SaaS product, which is the core of our SaaS product, and help it evolve further.</p><p>Although we are a fast-growing startup, we have already developed and provided products that have been implemented by many enterprise customers, including prime listed companies. This is an ideal field for those who want to focus on "quality" as an engineer, and for those who seek both the speed and professionalism of a startup.<br /><br /></p><p><strong>Selling points</strong></p><ul><li>The value of being a Japanese engineer who is serious about usability for Japanese users</li><li>Collaboration with a global team where English is the common language</li><li>Work on the core of product development and experience continuous improvement and growth</li><li>Full Remote / Work from home Full remote or in-coming options. Flexible work style and a culture based on trust.</li></ul><p><strong>The Role</strong></p><ul><li>Development and improvement of back-end functionality with a focus on Golang</li><li>Localization proposals and implementation for an intuitive and easy-to-understand UX for Japanese users</li><li>Collaboration with other teams (front-end, PM, etc.) and technical documentation</li><li>Active participation in technical discussions and improvement proposals within the team</li><li>Implementation and review with high code quality in mind</li></ul><p><strong>Technology Stacks</strong></p><ul><li>Frontend: React, Remix, Tailwind CSS</li><li>Backend: Go (Goa framework)</li><li>Infrastructure: AWS, Vercel, Terraform Cloud</li><li>Authentication: Auth0, Cognito</li><li>Database: DynamoDB, OpenSearch</li><li>CI/CD: GitHub</li><li>Communication: Slack, Linear, Notion</li></ul><p><strong>Required Skills</strong></p><ul><li>Back-end development experience: 3+ years (working experience with Golang a plus)</li><li>Experience working in English (including speaking, reading and writing): 2+ years</li></ul><p><strong>Skills and Experience</strong></p><ul><li>Implementation of Japanese search functionality (e.g. Elasticsearch)</li><li>Knowledge of data management, analysis, and engineering</li><li>Experience developing and operating BtoB SaaS products</li><li>Experience working in a startup environment</li><li>Computer science degree</li></ul><p><strong>We welcome people like this</strong></p><ul><li>People who value teamwork and can take initiative</li><li>People who want to provide great value to society through Japan's first SaaS product</li><li>People who enjoy the discretion and speed of a startup</li><li>People who are excited about the future of enterprise data management</li><li>People who share our mission and vision You are excited about the future of enterprise data management You share our mission and vision</li></ul><p><strong>Location</strong></p><ul><li>In principle, remote work (in Japan)</li><li>Office work in Hamamatsucho, Minato-ku, Tokyo (nearest: Hamamatsucho Station) is also possible if desired.</li></ul><p>Reference number：06940-0013260015</p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/U2hpbWFtdXJhLlNoaW5vYnUuODE1MDUuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p>Fullstack Platform Engineer<br />Location: Tokyo (Remote First)<br /><br />Interested in rolling up your sleeves to build an engine behind an AI-powered cybersecurity platform? We're looking for a seasoned Fullstack Platform Engineer to help us process billions of security events in real time, weave in smart analytics, and create clear, data-rich interfaces that keep enterprises one step ahead of complex security threats.<br /><br />What You'll Do<br />-Architect and implement scalable backend services and ETL pipelines (Kafka, ELK) in Rust, Go, Python, and TypeScript.<br />-Collaborate with ML and security teams to embed AI-driven threat detection and optimize system performance for millions of users.<br />-Build responsive front-end dashboards and tools using modern JavaScript frameworks.<br />-Enforce robust security measures (OAuth 2.0, encryption) and compliance with industry standards.<br />-Troubleshoot full-stack issues across cloud-native microservices, containers (Docker/K8s), and observability tools (Datadog, Vector).<br /><br />You Bring<br />-Bachelors in CS or related, with 5+ years in fullstack development.<br />-Proficiency in Rust and familiarity with Go, Python, Java, TypeScript.<br />-Strong cloud, microservices, and database (SQL/NoSQL) experience.<br />-A quick learner, excellent communicator, and a genuine passion for cybersecurity.<br /><br />Why Join Us?<br />Enjoy a collaborative environment, fully remote work arrangements, and a dedicated learning budget for certifications and conferences. Help us push the boundaries of cybersecurity innovation!</p><p> </p><p>Salary: 8M - 12M</p><p>Reference Number: 06940-0013251295</p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/S29qaS5ZYWdpbnVtYS4wMzczMC4xMDg5OEByaGlqcC5hcGxpdHJhay5jb20.gif">
<p><strong>Position Overview</strong><br /> <br /> Depending on your experience, you will be involved in a range of responsibilities, including:<br /> </p><ul><li>New development and feature enhancement of core systems (e.g., contract, billing, and payment management)<br /> </li><li>Design and development of new web services and APIs, including UI/UX improvements<br /> </li><li>Backend API development and modification for mobile applications<br /> </li><li>System planning for new business initiatives, requirement analysis, and QCD management<br /> </li><li>Full-cycle involvement from system and infrastructure design through development, testing, and operations/maintenance<br /> </li><li>Working in a hybrid internal/external development team structure, selecting the best technologies and team composition per project. You'll also participate in deciding tech stacks and architecture.<br /> </li></ul><hr /><h4><strong>Work Environment</strong></h4><ul><li><strong>Team Size:</strong> Approx. 30 members<br /> </li><li><strong>Technologies:</strong> AWS (ECS, Lambda, etc.), Docker, Laravel, Spring, Flutter, Terraform, Datadog<br /> </li><li><strong>Working Hours:</strong> 9:00-18:00 (flexible hours available); some overtime<br /> </li><li><strong>Work Style:</strong> 5-day workweek (weekends and national holidays off); 124 annual holidays; childcare and caregiving support systems available<br /> </li><li><strong>Location:</strong> Office near Ueno Station (Tokyo)<br /> </li></ul><hr /><h4><strong>What We're Looking For</strong></h4><ul><li>5+ years of experience in web system and API development (using PHP or Java)<br /> </li><li>Experience developing in cloud environments<br /> </li><li>Skills in designing with performance and scalability in mind<br /> </li><li>Proactive problem-solver with a hands-on attitude toward improvement in team development<br /> </li><li>Curiosity and enthusiasm for learning new technologies<br /> </li></ul><p><strong>Preferred qualifications include:</strong><br /> </p><ul><li>Knowledge of AWS<br /> </li><li>Experience leading small teams<br /> </li><li>Experience setting up CI/CD pipelines<br /> </li><li>Background in energy-related system development<br /> </li></ul><hr /><h4><strong>Career Paths</strong></h4><p>You'll have the opportunity to grow not only as a technical expert but also in roles such as project management, system planning, or people management. Many of our current managers started as engineers, and we offer an environment where you can grow on both technical and business fronts.<br /> </p><hr /><p><strong>Annual Salary:</strong> ¥8,000,000 - ¥10,000,000<br /> <strong>Reference Number:</strong> 06940-0013260037<br /> </p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/U2hpbWFtdXJhLlNoaW5vYnUuMjIyMTYuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p><strong>Shape the Future of Digital Payments as a Senior Backend Engineer</strong><br /><br />Are you ready to make a real impact on how millions of people shop online? Join a fast-growing Fintech innovator in Tokyo that's redefining the checkout experience. Here, your expertise will directly influence the evolution of digital payments-without the need for credit cards.<br /><br />If you're passionate about building robust systems and eager to see your work in action, this is your chance.<br /><br /><strong>What Makes This Opportunity Stand Out?</strong></p><ul><li>Global, Inclusive Team: Collaborate with talented professionals from over 30 countries. Diversity isn't just a buzzword-it's the foundation of our creativity and success.</li><li>Flexible Workstyle: Choose where and when you work best. Whether you prefer a fully remote setup or the energy of our Tokyo office, you have full autonomy from day one.</li><li>Tech-Forward Environment: Tackle complex challenges using modern technologies like Rust and Scala, Kafka, and a microservices architecture. We encourage experimentation and continuous learning.</li><li>Growth & Ownership: Be involved in every stage of the software lifecycle, from concept to deployment. Your ideas matter and your leadership will help shape both products and the team.</li><li>Supportive Culture: We value open communication, knowledge sharing, and a healthy work-life balance. Enjoy complete flex time, weekends off, and a comprehensive benefits package-including retirement and pension plans.</li></ul><p><strong>Your Role</strong></p><ul><li>Lead and contribute to the design and development of scalable backend systems using Scala and other modern languages.</li><li>Drive projects from requirements gathering through to implementation, testing, and operation.</li><li>Collaborate with cross-functional teams to integrate with external APIs and financial products.</li><li>Mentor team members and help set technical direction.</li><li>Continuously improve system reliability, security, and performance.</li></ul><p><strong>What We're Looking For</strong></p><ul><li>Solid experience in backend development with languages such as Scala, Java, Kotlin, Rust or interest in Functional Programming</li><li>Proven ability to design new systems and enhance existing applications.</li><li>Strong communication skills in English; Japanese is a plus but not required.</li><li>Experience in Fintech or with functional programming is highly valued.</li><li>A proactive, collaborative mindset and a drive to make a difference.</li></ul><p><strong>Salary</strong></p><ul><li>8 million yen - 12 million yen</li></ul><p><strong>Location</strong></p><ul><li>Tokyo</li></ul><p>Reference number : 06940-0013257393</p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/S2hhbmcuTGUuNzMwNjkuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p>🗾 Tokyo, Japan | 🏠 Full Remote | ⚡ Functional Programming Excellence<br /><br /><br />💰 Transform Digital Payments with Functional Programming<br /><br />Join our dynamic engineering team building next-generation payment gateway solutions that power thousands of merchants across Japan's diverse payment ecosystem. Our proprietary platform seamlessly integrates credit card processing with QR payment systems and bank transfers, creating unified experiences for businesses of all sizes.<br /><br /><br />✨ What Sets This Role Apart<br /><br /><br />🎯 Engineering Excellence & Autonomy<br /><br />Lead technical decisions in a flat organization where your voice shapes product direction<br />Work with production systems processing real transactions at scale<br />Collaborate in high-performing teams without corporate bureaucracy<br />Direct access to leadership for proposing improvements and driving initiatives<br /><br /><br />📈 Career Growth & Impact<br /><br />Expand functional programming expertise with industry-leading mentorship<br />Take ownership of entire system components from conception to deployment<br />Contribute to architectural decisions for large-scale distributed systems<br />Work across diverse technical challenges beyond traditional API development<br /><br /><br />⚖️ Work-Life Integration<br /><br />Complete location flexibility with full remote capabilities<br />Flexible scheduling respecting your optimal productivity hours<br />Strong retention culture - many engineers return for the autonomy and impact</p><p><br />🛠️ Core Responsibilities<br /><br />🏗️ Design resilient, scalable backend services for cloud-native payment processing<br />🔗 Implement robust API systems serving high-volume transaction flows<br />👥 Participate in code reviews and mentor team members<br />🔄 Drive continuous improvement initiatives across development workflows<br />🤝 Collaborate with cross-functional teams to deliver integrated solutions<br /><br /><br />✅ Required Qualifications<br /><br /><br />💻 Technical Foundation<br /><br />3+ years of object-oriented programming experience<br />1+ years of functional programming experience (Scala, Java, Kotlin preferred)<br />Strong API development and web service architecture background<br />Proficiency with relational database systems and query optimization<br />Experience with Git-based version control and collaborative development<br />Proven track record developing comprehensive automated test suites<br />Computer Science degree or equivalent technical background<br /><br /><br />🌟 Valuable Additional Skills<br /><br />📡 Event-driven architecture and messaging system implementation<br />🗄️ NoSQL database design and AWS cloud services experience<br />🔧 Microservices design patterns and CI/CD pipeline development<br />💼 Financial services domain knowledge<br />🌐 Open source contribution history<br />🗣️ Conversational Japanese ability for enhanced team collaboration<br /><br /><br />🎯 Why Choose Us<br /><br />🚀 Technical Innovation<br /><br />Work on systems processing real financial transactions at scale<br />Contribute to entirely in-house developed technology stack<br />Influence architectural decisions impacting thousands of merchants<br />Access cutting-edge functional programming practices</p><p><br />🌱 Professional Growth<br /><br />Transition from larger corporate environments to high-impact startup culture<br />Direct involvement in feature planning and business strategy discussions<br />Exposure to complete product development lifecycle<br />Join a community of developers who specifically returned for our collaborative environment</p><p>Ref No.: 06940-0013260806</p><p><br /> </p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/S2hhbmcuTGUuMjg2NTguMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p>【Principal Backend Engineer】We are looking for a technical leader to play a central role in a fast-growing SaaS product!</p><ul><li>A fast-growing enterprise SaaS product that is being adopted by major companies. We are looking for a Principal Backend Engineer to lead the backend development and raise the team's technical capabilities and quality.</li><li>This is not just a "development lead," but a position where you can make decisions and exert influence across the three axes of technology, business, and organization.</li></ul><p><strong>Selling points</strong></p><ul><li>Technology and design decision-making authority to support mid- to long-term product growth</li><li>Bilingual engineering organization at the intersection of local and global</li><li>Deep involvement in strategy with an understanding of both product development and business</li><li>Flexible work style with flextime and remote work OK</li></ul><p><strong>The Role</strong></p><ul><li>Develop and improve back-end functionality and design reviews for our SaaS products</li><li>Improve code quality and design capabilities of the entire team and build a review culture</li><li>Technical and strategic collaboration with stakeholders (product, sales, support)</li><li>Lead high-quality localization for the Japanese market</li><li>Improve development process, Team development, formulation of design guidelines</li><li>Make and lead decisions with a mid- to long-term perspective, including technology selection and infrastructure design</li></ul><p><strong>Technology Stacks</strong></p><ul><li>Front-end: React, Remix, Tailwind CSS</li><li>Back-end: Go (Goa), Python</li><li>Infrastructure and CI/CD: AWS, GCP, Azure, Vercel, Terraform Cloud, GitHub</li><li>Database: DynamoDB,. OpenSearch, Databricks</li><li>Authentication infrastructure: Auth0, Amazon Cognito</li><li>Knowledge and documentation: Notion, Google Workspace</li><li>Communication: Slack, Linear</li></ul><p><strong>Required Skills and Experience</strong></p><ul><li>10+ years of back-end development experience (working experience in Go or Python preferred)</li><li>5+ years of experience leading development teams (including code review, design guidance, and training)</li><li>2+ years of practical communication (spoken and written) in English</li></ul><p><strong>Welcomed Skills and Knowledge</strong></p><ul><li>Experience developing and operating enterprise software products</li><li>Experience utilizing Japanese natural language processing, search algorithms, and AI technologies</li><li>Deep knowledge of data infrastructure design, ETL, and data governance</li></ul><p><strong>What we look for in a person</strong></p><ul><li>You can focus on the success and growth of the team as much as your own achievements</li><li>You want to be involved in the product from both a technical and business perspective</li><li>You have the flexibility to enjoy the speed and change unique to startups</li><li>You are interested in the future of BtoB SaaS and enterprise data in Japan</li><li>You find a mission-driven environment challenging You are interested in the future of BtoB SaaS and enterprise data in Japan.</li></ul><p><strong>Work Environment</strong></p><ul><li>Working hours: Full remote available (hybrid system with option to come in 1-3 days a week)</li><li>Office location: Minato-ku, Tokyo (Hamamatsucho area)</li><li>Employment status: Full-time</li><li>Working hours: Flextime system (core hours 11:00-15:00)</li><li>Holidays: Weekends, holidays, annual paid vacation, special leave upon hire</li></ul><p>Reference number：06940-0013260019</p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/U2hpbWFtdXJhLlNoaW5vYnUuMTgyNDAuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p>Frontend Engineer - Business Cloud Services (Fukuoka Office / Hybrid Work)<br />Applicants must reside in Japan.<br /><br />We are hiring a frontend engineer to join our Fukuoka Development Base, a growing hub dedicated to building business-oriented cloud platforms. Established with a focus on innovation and ownership, this base plays a key role in developing core services used by enterprises across the country-including expense management, accounts payable, and a cashless business payment platform launched from Fukuoka.<br /><br />As a frontend engineer, you'll work closely with product teams to enhance UI/UX, improve performance, and contribute to scalable, modern frontend architecture using React and TypeScript.<br /><br />Key Qualifications:</p><ul><li>Strong web application development experience (HTML, CSS, JavaScript)</li><li>Hands-on experience with React or similar component-based frameworks</li><li>Passion for frontend quality, usability, and maintainability</li></ul><p><br />Preferred:</p><ul><li>TypeScript, GraphQL, Jest, or accessibility knowledge</li><li>Familiarity with modern frontend tooling and agile workflows</li></ul><p><br />Work Setup:</p><ul><li>Hybrid model: minimum 2 days/week at our Fukuoka office</li><li>English is the main development language; Japanese not required but interest in learning is welcomed</li><li>PC/equipment support, book purchases, conference participation available<br /><br /></li></ul><p>Working Place: Fukuoka (hybrid work) </p><p>Reference No.: 06940-0013264316</p><p><em>By clicking 'apply', you give your express consent that Robert Half may use your personal information to process your job application and to contact you from time to time for future employment opportunities. For further information on how Robert Half processes your personal information and how to access and correct your information, please read the Robert Half privacy notice <a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a>. Please do not submit any sensitive personal data to us in your resume (such as such as race, beliefs, social status, medical history or criminal record) as we do not collect your sensitive personal data at this time.</em></p><hr /><p>お客様が「今すぐ応募」ボタンをクリックすることにより、ロバート・ハーフ（以下、当社）がお客様の応募内容を処理し、求人情報を今後随時ご連絡する目的で個人情報を使用することに明示的に同意ただいたこととなります。当社による個人情報の処理方法、またお客様自身の個人情報へのアクセスおよびその訂正に関する詳細については、プライバシー規約（<a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a>）をお読みください。当社は、要配慮個人情報はお預かりしておりませんので人種、信条、社会的身分、病歴、犯罪の経歴など、取扱いに特に配慮を要する個人情報は、ご提出いただく職務経歴書・レジュメ等に含めないようお願いいたします。</p><img src="https://counter.adcourier.com/U2hpbWFtdXJhLlNoaW5vYnUuOTc4NjIuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
