<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><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><strong>WHY THIS OPPORTUNITY IS SPECIAL</strong></p><ul><li>Enterprise transformation leadership - Guide teams building solutions the world's largest insurance companies</li><li>Rapid growth trajectory - Company approaching $1B revenue with aggressive expansion plans across APAC markets</li><li>Technical innovation at scale - Oversee cloud-native microservices architecture serving hundreds of global clients</li><li>Exceptional work-life balance - 21 paid vacation days from year one plus separate sick leave allowance</li><li>Ultimate work flexibility - Work from abroad for months annually plus hybrid Tokyo office model</li></ul><p><strong>Job Responsibilities</strong></p><ul><li>Design and develop new capabilities for enterprise software serving hundreds of companies globally</li><li>Build enterprise applications using Java, Spring Boot, ReactJS and modern AWS-based architecture</li><li>Guide technical oversight of cloud-native platforms built with Docker, Kubernetes, and Terraform</li><li>Enhance existing products while architecting completely new solutions for regional business requirements</li><li>Participate in full development lifecycle from planning through deployment and showcasing results</li><li>Contribute to CI/CD pipelines using TeamCity, Jenkins, and Docker for streamlined delivery</li></ul><p><strong>Qualifications</strong></p><p>Essential Requirements:</p><ul><li>Experience in enterprise software systems with expertise in data modeling and system architecture (5+ years)</li><li>Strong Java development skills using Spring, Spring Boot, JUnit, Mockito, Gradle/Maven</li><li>Experience with CI/CD tools and containerization technologies like Docker</li><li>Solid English and Japanese communication abilities for global team collaboration (daily operations conducted primarily in Japanese)</li><li>Japan work authorization (permanent resident, citizen or valid work visa)</li></ul><p>Bonus Points:</p><ul><li>ReactJS or frontend development experience</li><li>AWS, GCP or Azure cloud platform knowledge</li><li>Open door policy advocate who thrives in flat organizational structures with direct leadership access</li><li>Domain knowledge in insurance or financial services</li></ul><p><strong>Location </strong></p><p>Tokyo</p><p><strong>Salary</strong></p><p>9 - 15 million yen</p><p> </p><p>Reference Number: 06940-0013301830 </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/S2hhbmcuTGUuOTY0MDguMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p>Highlight<br />- Drive high-impact global data initiatives that directly shape business strategy and decision-making<br />- Be part of a a company recognized for its innovation in AI-powered decision intelligence<br />- Join during a critical growth phase in Japan, with the opportunity to shape the local team, influence market strategy, and build something lasting from the ground up<br /><br />Company Overview<br />Global AI-driven data technology company, is transforming how organizations use data to drive decisions. Originally focused on fighting financial crime, its platform now powers decision intelligence across various industries.<br /><br />Role<br />You'll lead the technical design and delivery of complex, data-driven systems for enterprise clients. You'll work closely with internal teams and external stakeholders to ensure successful implementations, while also contributing to technical best practices.<br /><br />Key Responsibilities<br />-Design and lead end-to-end solution architectures tailored to client needs<br />- Guide internal teams and act as a trusted technical advisor to enterprise clients<br />- Solve complex data and system integration challenges using modern tech stacks<br />- Contribute to best practice development, mentoring, and technical leadership across teams<br /><br />Required Skills<br />- Strong hands-on experience in technical delivery with coding ability in Spark, Scala, Java, or Python<br />- Deep understanding of software development lifecycle, testing, version control, and design best practices<br />- Expertise in building scalable, secure, and maintainable data-driven solutions<br />- Fluent in both Japanese and English with excellent communication and client-facing skills</p><p> </p><p>Location: Tokyo</p><p>Salary: 25M - 32M</p><p>Referene Number: 06940-0013273942</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/eXVpbmEua2FuYXphd2EuMTIyODcuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p><strong>Company Profile</strong></p><p>Global software company headquartered in UK<br /><br /></p><p><strong>About the Role<br /></strong><br />Our client is looking for a Solution Architect to join our delivery team and lead the technical side of client projects. In this role, you'll design and guide the development of data-driven solutions for large enterprise clients.</p><p>You'll work closely with internal teams and external stakeholders to make sure our solutions are technically sound, scalable, and aligned with client needs. You'll also help improve engineering practices and mentor other team members.</p><p><strong>What You'll Do</strong></p><ul><li>Design reliable, scalable systems that meet technical and business needs.</li><li>Lead technical decision-making across multiple projects.</li><li>Act as a trusted advisor to clients, helping them get the most out of their data solutions.</li><li>Mentor engineers and support their growth.</li><li>Improve company-wide engineering practices.</li><li>Manage your own tasks and timelines across different projects.</li></ul><p> </p><p><strong>What We're Looking For</strong></p><ul><li>A strong focus on delivering value to clients.</li><li>Experience leading enterprise system development-from design to deployment.</li><li>Hands-on coding experience with Spark, Scala, Java, or Python (production level).</li><li>Solid understanding of the software development lifecycle (testing, Git, best practices).</li><li>Strong background in designing data-driven applications with attention to performance and security.</li><li>Good knowledge of data quality, schema evolution, and rollback strategies.</li><li>Excellent communication skills, able to explain technical topics to non-technical people.</li><li>Fluency in both Japanese and English is required.</li></ul><p><strong><br />Why You'll Enjoy Working with Us</strong></p><ul><li>Work on important projects with large enterprise clients.</li><li>Use modern technology to solve real business problems.</li><li>Help shape the team's engineering culture and practices.</li><li>Enjoy a collaborative and international work environment.</li><li>Make a direct impact on the success of our clients and company.<br /><br /></li></ul><p>Location: Tokyo, Japan<br /><br />Salary: 20M JPY<br /><br /><br />Reference Number: 06940-0013261703</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/aWt1bWkua2FuZGEuNzkyODYuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p>Are you passionate about building products that impact hundreds of millions of users? Join a team developing the Android client for one of the most widely used communication apps in Japan and across Asia. This platform is evolving beyond messaging, integrating AI and diverse services to become an essential life platform for daily living.<br /><br />What You'll Do<br /><br />-Collaborate with project managers, UI/UX designers, data scientists, and business stakeholders to design, develop, and enhance Android client features.<br />-Drive stability and performance improvements for an app relied upon daily by millions.<br />-Participate in ongoing codebase improvements, refactoring, and performance optimization.<br />-Contribute to the development environment, including CI automation and code review workflows.<br />-Engage with user feedback to deliver meaningful product enhancements.<br />-Work on a large-scale, mature codebase with opportunities to influence architecture and best practices.<br /><br />Who We're Looking For<br /><br />- Strong communicator in English OR Japanese.<br />- Experience developing native Android applications using Kotlin and Java in a team environment (including code reviews).<br />- Ability to propose and drive improvements across planning, development, and testing processes.<br />- Eager to enhance team productivity through codebase, tooling, or knowledge sharing.<br />- UI/UX design and development experience.</p><p>Salary<br />- 8 million yen - 12 million yen</p><p><br />Location<br />- Tokyo</p><p>Reference number:06940-0013256389</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/V2F0dW55dS5TaXJpcGFpcm9qLjcyODc2LjEwODk4QHJoaWpwLmFwbGl0cmFrLmNvbQ.gif">
