Top Software Engineer Jobs in Tokyo

Design, develop, verify, and maintain ground-segment software for Flight Dynamics. Lead supplier-developed products, build in-house Flight Dynamics modules, produce documentation, support verification/integration, and assist satellite operations. Develop full-stack web applications, work in Linux, use Python and Docker, and collaborate across teams.

Develop, simulate, prototype, verify and debug GNC flight software for spacecraft using C/C++ and Python. Build dynamics, sensor/actuator models (USF-Sim), run Monte Carlo analyses, maintain CI/CD (GitLab), containerized environments (Docker), and document work in Jira/Confluence while collaborating with multidisciplinary teams.

As a Software Engineer, you will develop a platform for creating and managing labeled datasets, collaborate with engineers, and deliver scalable data solutions.

As a Software Engineer at Spellbrush, you'll build advanced data pipelines and infrastructure to support AI research while collaborating with a talented team.

Build and ship native Android features for an AI-enabled neobank using Kotlin and modern Android architecture. Integrate backend APIs, improve performance and stability, use analytics to iterate, and design AI-assisted mobile experiences in collaboration with product and design.

Customer-embedded principal engineer who designs, builds, and ships production-grade solutions, translates business needs into technical approaches, influences senior stakeholders, and transitions work to FDE teams to deliver measurable outcomes.

Develop and optimize real-time onboard autonomy software for heavy vehicles, including perception, sensor fusion, planning execution, control, and safety monitoring. Maintain middleware for sensor ingestion, ensure deterministic latency and throughput, implement ASIL-relevant fault detection and recovery, build diagnostics and observability, write unit/integration/HIL tests, contribute to CI/CD, and productionize research into efficient C++ deployments.

Design and implement high-performance control modules for off-road autonomous vehicles. Characterize vehicle dynamics, close sim-to-real gaps, and build optimal-control solutions (e.g., nonlinear MPC, MPPI). Test controllers on production vehicles and collaborate with customer engineers to deploy robust autonomy under real-world constraints.

Design, develop, and deploy secure software to transform patient data into real-world evidence. Lead architecture and data extraction/web application development, troubleshoot hospital deployments and complex network constraints, mentor engineers, and collaborate with clinicians, product, and data teams.

Provide global support for IFS business applications in the manufacturing domain: resolve medium-complexity customer issues, meet SLA/KPI targets, execute maintenance, share knowledge, train colleagues, and propose process improvements to increase customer satisfaction.

Lead backend design and development for a mobile-first strategy-building fintech: build scalable Python/FastAPI services, real-time APIs/WebSockets, integrate market data providers, optimize performance across large datasets and simulations, contribute front-end React/TypeScript work, maintain containerized deployments and CI/CD pipelines, and document and collaborate in an async-first team.

Improve developer experience and deployment processes by designing and building tools, libraries, and frameworks; optimize build/compile times; develop scalable deployment tools for automotive and cloud platforms; enhance software deployment and data collection frameworks; identify and resolve bottlenecks across the software stack.

Design, develop, and deploy secure software to transform patient data into real-world evidence. Lead architecture and data extraction/web application efforts, troubleshoot complex hospital infrastructure during on-site deployments, mentor engineers, and collaborate with clinicians, product, and data teams to deliver high-quality data products.

Develop and maintain the Comet APAC Structured Products platform for equity derivatives covering pre-trade and post-trade pricing, trade capture, legal documentation and client connectivity. Write code and unit tests, participate in code/design reviews, ensure scalable performant secure code, collaborate with global and cross-functional teams, and provide second-level support.

Lead backend architecture and build scalable, high-concurrency services and APIs (Node.js) powering web and mobile. Own components end-to-end, manage CI/CD and infrastructure (IaC, containers, cloud), improve reliability, and collaborate with PM/design to deliver core features like live interactions and checkout.

The role involves developing the Guidance Navigation Control subsystem for a lunar lander, including algorithm design, testing, and integration with teams for operation preparation and troubleshooting.

Lead full-stack development for APAC-focused intelligent data pipelines and AI-powered features. Collaborate with engineers, product, and analysts to design, prototype, and ship production-ready systems using LLM SDKs, integrate proprietary data assets, and support custom client solutions.

Join Valeo as a VIE Software Engineer, supporting software project management and quality assurance in a dynamic, multicultural environment focused on automotive innovation.

Design and implement open source networking solutions, collaborate with cloud providers, and contribute to technical documentation and community efforts.

As a C# Software Engineer, you'll design and implement classes for document IDE, refactor code for extensibility, and interview users to understand needs.

Design, develop, and optimize autonomous AI agents capable of reasoning, planning, tool use, and multi-step execution. Build agent frameworks, human-AI collaboration mechanisms, monitoring and evaluation systems, and production integrations. Apply large language models, prompt engineering, reinforcement learning, planning algorithms, workflow orchestration, and system design. Collaborate cross-functionally while researching advances in agent technology and improving reliability, accuracy, safety, and efficiency.

Participate in cryptography research for blockchain applications, focusing on post-quantum signatures, threshold signatures, signature aggregation, and proof systems. Benchmark NIST PQ standards, collaborate with senior researchers to apply results, publish findings, and contribute to open-source projects.

Design, develop, and maintain cloud-based analytics applications for life sciences supply chain operations. Build scalable backend services, provide architectural guidance, write high-performance code, and collaborate with data scientists, architects, product teams, and QA. Contribute to product strategy, estimate and track complex initiatives, support Agile development, and participate throughout the software development lifecycle.

Develop and maintain features for Westlaw Japan and its next-generation platform using front-end and back-end technologies. Work with senior engineers to understand architecture, fix defects, participate in code reviews, follow Agile processes, and collaborate with product and QA to deliver secure, high-performance legal research software.

Build and architect Base360.ai: design and launch booking, pricing, payments, operations, and AI-powered automation. Integrate platforms (Airbnb, Stripe, Twilio, OpenAI), scale systems internationally, and embed AI workflows to automate operations and optimize revenue.