<p>Build Japan's Payment Future with ML & Functional Programming<br /><br /><strong>Company Profile</strong><br />A rapidly growing fintech company transforming digital commerce in Japan is seeking a Product Engineer. The platform processes millions of transactions using proprietary machine learning models to enable seamless online shopping experiences. Backed by major global payment companies and leading financial institutions, the organization combines innovative technology with enterprise stability. The engineering team represents 40+ nationalities working in English, maintaining a casual, collaborative culture at their central Tokyo office.<br /><br /><strong>The Role</strong></p><ul><li>Architect and scale payment platform components while maintaining security, resilience, and maintainability standards for high-volume transaction processing</li><li>Collaborate directly with product teams to translate business objectives into technical solutions, communicating design tradeoffs clearly across engineering and product stakeholders</li><li>Work cross-functionally in feature teams to deliver services that directly impact user acquisition and conversion rates</li><li>Participate in systematic code reviews and maintain testing practices that ensure production-grade quality for mission-critical payment infrastructure</li><li>Stay current with industry patterns and suggest performance improvements based on data-driven insights from real-world payment flows</li><li>Navigate ambiguity with sound judgment while defining deliverables and maintaining urgency for business-critical releases</li></ul><p><br /><strong>Your Skills</strong><br />Essential Requirements:</p><ul><li>Proficiency in Scala (or strong in functional programming like Rust, Haskell, C++) with curiosity about functional programming paradigms</li><li>Strong grasp of software architecture, design patterns, and how they align with distributed service structures</li><li>Experience writing clean, maintainable code with systematic debugging approaches and automated testing mindset</li><li>Understanding of security implications across distributed systems and payment infrastructure</li><li>Comfortable reading unfamiliar codebases and making intelligent inferences about broader system context</li><li>Genuine interest in how engineering strategy connects to product development and business growth</li></ul><p>Bonus Experience (Not Required but Valued):</p><ul><li>Hands-on experience with Scala, Cassandra, Kafka, PostgreSQL, AWS (Fargate/Terraform), or functional programming libraries (cats, cats-effect)</li><li>Background in microservices architecture, event sourcing, CQRS patterns, or REST API design</li><li>Previous work on payment platforms, distributed systems, or fintech products</li><li>Understanding of cross-team dependencies and ability to envision technical roadmaps</li></ul><p><br /><strong>Key Highlights of the Role</strong></p><ul><li>Solve genuine technical challenges at scale. Building payment infrastructure that underwrites real-time transactions using proprietary ML models for major e-commerce platforms</li><li>Work with a modern functional programming stack (Scala, cats-effect, tagless final) alongside distributed systems technologies like Kafka, Cassandra, and event sourcing architectures</li><li>Join a truly international engineering team where English is the working language and colleagues represent 40+ nationalities - rare opportunity for Tokyo tech roles</li><li>Shape technology evolution in a well-funded organization transitioning from startup agility to enterprise scale</li><li>Enjoy genuine work-life balance with full flextime (no core hours), up to 3 days remote per week and generous paid time off (20+ days from first year)</li><li>Competitive compensation package with comprehensive retirement programs and premium central Tokyo office access</li></ul><img src="https://counter.adcourier.com/S2hhbmcuTGUuMjQzMzYuMTA4OThAcmhpanAuYXBsaXRyYWsuY29t.gif">
<p><strong>Company Profile</strong></p><p>A post-IPO tech company in the hospitality industry</p><p> </p><p><strong>The Role</strong></p><ul><li>Lead migration to Service-Oriented Architecture-define domain boundaries, design APIs, select tech stack</li><li>Own full software lifecycle-launch strategies, zero-downtime deployments, observability implementation</li><li>Translate vague product requirements into technical specs, identifying implicit constraints</li><li>Design database schemas for performance, scale, and consistency in distributed payments/bookings</li></ul><p><strong>Your Skills </strong></p><ul><li>Proficiency in statically typed languages (Go, Kotlin, Scala, Rust, C#) with strong async/concurrent programming skills</li><li>Experience building SOA services and refactoring legacy monoliths</li><li>Hands-on CI/CD and zero-downtime deployment experience</li><li>Knowledge of scalable databases (Cassandra, AWS Aurora)</li><li>Expertise with observability tools (Datadog, Grafana, Prometheus)</li></ul><p> </p><p> </p><p><strong>Location </strong></p><p>Tokyo</p><p><strong> </strong></p><p><strong>Salary</strong></p><p>8 - 11 million yen</p><p><strong> </strong></p><p>Reference Number: 06940-0013343690</p><p><br /> </p><p><em>By clicking 'apply', you are deemed to have agreed to Robert Half Japan Privacy Notice (</em><em><span style="text-decoration: underline;"><a href="https://www.roberthalf.com/jp/en/privacy">https://www.roberthalf.com/jp/en/privacy</a></span></em><em>). Please ensure that your application documents do not include sensitive personal data such as race, beliefs, medical history, criminal record, or other information irrelevant to hiring process such as spouse or dependents. All information must be accurate and truthful, and any included hyperlinks must be safe and secure.</em></p><hr /><p><em>「応募」をクリックすることにより、お客様はロバート・ハーフ（以下、当社）のプライバシー通知（</em><em><span style="text-decoration: underline;"><a href="https://www.roberthalf.com/jp/ja/privacy">https://www.roberthalf.com/jp/ja/privacy</a></span></em><em>）に同意したものとみなされます。</em> <em>応募書類には、人種、信条、社会的身分、病歴、犯罪の経歴などの要配慮個人情報や、配偶者、扶養家族など採用選考に無関係な情報を含めないようご注意ください。記載する情報はすべて正確かつ真実であること、また、ハイパーリンクを含める場合には、安全性と信頼性が確保されていることをご確認ください。</em></p><img src="https://counter.adcourier.com/TmFuY3kuWXVhbi43MzM0OS4xMDg5OEByaGlqcC5hcGxpdHJhay5jb20.gif">
