Top Tech Jobs & Startup Jobs in Japan

Build end-to-end machine learning systems spanning research reproduction, model evaluation, inference infrastructure, backend services, and product interfaces. Design rigorous experiments, evaluation datasets, and verification workflows; analyze model internals; investigate provenance and evasion; and convert findings into reliable production systems with APIs, background jobs, observability, testing, documentation, and user-facing React/TypeScript experiences.

Owns the full lifecycle of major partner events from contract signing through final closeout. Coordinates event organizers and internal teams, manages requirements, documentation, timelines, product and process needs, and stakeholder communications. The role also develops support Q&A, prioritizes product requirements with engineering, and may provide on-site support during launches. Success requires project management experience, strong organization, communication, analytical skills, and fluency in English and Japanese.

Build and scale Base360.ai’s short-term rental platform across frontend, backend, integrations, automation, dashboards, and AI-powered workflows. Work directly with customers, founders, and designers to identify problems, ship end-to-end solutions, and improve product outcomes. Develop reliable APIs, event-driven automations, cloud infrastructure, and integrations with Airbnb, Stripe, Twilio, OpenAI, and other platforms. Own features from discovery through deployment while balancing usability, security, scalability, and maintainability.

Supports enterprise information security governance, risk, and compliance across security, privacy, data, AI, regulatory, and assurance functions. Responsibilities include developing controls and policies, mapping ISO and regulatory requirements, coordinating audits and evidence, managing exceptions and remediation, supporting ISMS and ISMAP readiness, enabling governance automation, coaching stakeholders, and reporting risk metrics. The role also contributes to responsible AI governance, data governance, awareness initiatives, incident-response governance, and continuous improvement.

Develop realistic backend coding challenges, including feature implementations and bug fixes, for AI training projects. Design deterministic verifiers, automated tests, and validation criteria that distinguish correct from incorrect solutions. Evaluate code for correctness, reliability, maintainability, security, and performance while identifying edge cases and bottlenecks. Work independently with backend technologies and refine tasks based on project requirements and quality standards.

Leads multi-country HR service delivery across APAC and/or the Middle East, overseeing escalations, compliance, case quality, SLAs, operational controls, audit readiness, and process standardization. Manages and mentors HR service delivery specialists, collaborates with Payroll, Benefits, Legal, Finance, vendors, clients, and workers, and drives automation, workflow optimization, risk mitigation, and continuous improvement.

Build and lead the AI engineering platform for enterprise COBOL modernization. Responsibilities include designing transformer models for COBOL-to-Java/Python translation, developing high-performance code analysis engines, optimizing inference, architecting distributed cloud-native systems, and delivering reliable AI pipelines for large enterprise codebases. The role also includes hiring and leading engineering teams, shaping product strategy, and partnering with the CEO as a technical co-founder.

Leads global tax reporting, accounting, forecasting, provisioning, governance, and transparency activities. Owns the OneSource tax provisioning platform, drives automation and process improvements, and ensures compliance with Pillar Two and Country-by-Country Reporting requirements. Partners with global Finance and Tax teams, oversees tax disclosures and Board reporting, supports strategic tax initiatives, and provides leadership on emerging international tax developments.

Serves as the primary technical partner for enterprise customers, leading Claroty solution planning, deployment, configuration, adoption, optimization, and technical support. Provides architecture guidance, manages risks and escalations, creates technical documentation, translates customer feedback for internal teams, and presents strategic cybersecurity roadmaps to technical and executive stakeholders. Requires frequent customer engagement and up to 30% travel.

Design and execute comprehensive test plans for dApps and smart contracts, perform unit/integration/end-to-end testing, run security audits and vulnerability assessments, automate tests within CI/CD pipelines, monitor quality metrics, debug issues, and collaborate with developers and product managers to ensure reliable DeFi/EVM-compatible applications.