Top Software Engineer Jobs in Japan

The Forward Deployed Software Engineer designs and implements data-driven solutions for clients, collaborating with diverse teams to tackle complex problems and drive impactful results.

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 maintain software systems supporting R&D teams in quantum computing. Collaborate with physicists and engineers to understand existing systems, design new applications, improve GUIs and UX, and ensure long-term maintainability. The role requires Python and C++, microcontroller and control-systems experience, and knowledge of RPC, REST, and signal analysis.

Develop and maintain Tether’s peer-to-peer stack and modular ecosystem of more than 1,500 public npm modules. Build production-scale Node.js applications, create reusable modules, write tests, debug systems, and collaborate within a globally distributed remote team. Preferred work includes native Node.js extensions using C/C++, lower-level JavaScript bindings, network protocol optimization, advanced networking, and open-source contributions in P2P or decentralized technology.

Design, deploy, and scale production AI systems and applications. Responsibilities include building data pipelines, tuning and hardening models, collaborating with researchers, engineers, and product managers, monitoring live models, tracking AI advances, conducting code reviews, and owning solutions end to end amid changing priorities.

Leads solution discovery, functional analysis, UX conceptualization, user-story development, Agile delivery, production support, and functional analysis team management. Collaborates with product owners, Scrum masters, developers, and support partners to design and deliver digital solutions. Requires extensive system design, development, operations, and maintenance experience, plus strong knowledge of Java, JavaScript, Spring Boot, React, relational databases, cloud technologies, project management, communication, and problem solving. English-Japanese bilingual proficiency is preferred.

Design and lead development of high-performance O-RAN and 5G/6G software for an AI-RAN accelerator. Responsibilities include L1/L2 processing, real-time wireless pipelines, SDR and RF hardware integration, AI/ML applications, system testing, troubleshooting, documentation, and technical collaboration with operators and partners.

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.

Develop real-time motion-control software for robotic manipulators, including inverse kinematics, collision avoidance, trajectory generation, time parameterization, compliance control, actuator integration, and ROS2-based systems. Build production-ready robotics software and simulation environments using MoveIt and Gazebo. The role requires advanced C++ development on Linux, robotics control theory, motor-control expertise, and integration of industrial communication protocols.

Develop, deploy, debug, and optimize software components for Intel Open Edge platforms. Build AI applications for robotics, generative AI, and visual analytics; troubleshoot Linux installations; optimize AI pipelines across CPUs, GPUs, and NPUs; analyze benchmarks; create technical documentation and demos; and support customers across Asia-Pacific.

Build, operate, and enhance low-latency Python applications supporting Rates trading desks with real-time risk, PnL, and decision-support capabilities. Responsibilities include production support, troubleshooting, system design, performance optimization, monitoring, incident response, and delivery of resilient services. The role partners closely with traders, leads technical initiatives, mentors engineers, and promotes secure, responsible use of AI-assisted development tools.

Lead technical presales engagements for large enterprise customers, designing cloud and AI solutions that modernize software development. Conduct architecture sessions, demonstrations, and proof-of-concept engagements featuring GitHub Copilot. Advise engineering leaders on secure, compliant developer productivity and application modernization, support strategic account plans, accelerate adoption, and share customer insights with product, engineering, and partner teams.

Build and operate production custody systems: signing service, key management, chain integrations, and transaction pipelines. Own end-to-end subsystems, integrate new chains, collaborate with cryptography on threshold signing and key recovery, write post-mortems, and produce clear async design docs and PRs.

Design, build, and deliver cloud-based solutions with customers; write, refactor, and debug code; produce design documents; act as DRI/on-call; improve reliability, observability, and performance; collaborate with product teams, partners, and open-source communities.

Build core components of a diagnostic and personalization platform: backend data pipelines, frontends, services for genomic data ingestion, ML model integration, APIs, and cloud infrastructure. Collaborate with product and ML teams, iterate on prototypes and MVPs, and make architectural decisions supporting scalability and reliability.

Design and build the on-prem software stack for ModelVault appliances: containerized inference engines, model integration (LLMs/vision), deployment tooling, CLIs/GUI/APIs, OS and GPU setup, remote updates, telemetry, and collaborate with customers and founding team to iterate and scale the engineering org.

Build and ship native Android features for an AI-enabled neobank using Kotlin. Integrate backend APIs, improve performance and reliability, collaborate with product/design, and implement on-device AI where it improves user journeys.

Design, develop, maintain, and deploy reliable backend services for the Robot Platform; improve test coverage, CI/CD, and monitoring; collaborate cross-functionally; monitor and troubleshoot production services and occasionally travel to Woven City for on-site maintenance.

The Senior Full-Stack Software Engineer will design and develop full-stack cloud services for enterprise clients, ensuring code quality and potentially mentoring a small team.

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.

Establish and improve software quality assurance processes for automotive and automated-driving software. Responsibilities include defining development processes, supporting adoption, reviewing QA activities, auditing engineering projects, identifying non-compliance, preparing management reports, recommending corrective actions, and improving quality through automation tools. The role collaborates with developers, architects, testers, project managers, customers, and other stakeholders in a hybrid office environment.

Build and optimize distributed Lance dataset operations, high-performance indices, table formats, and data encodings in Rust. Develop integrations with Spark, Hive Metastore, Presto, Trino, Ray, and other data infrastructure systems. Improve internal data processing infrastructure, contribute to open-source communities, and promote Lance through technical conferences. The role requires deep distributed systems expertise and extensive experience with high-performance databases, big data, or AI training systems.

Leads end-to-end software engineering delivery for securities lending technology across Japan and Asia. Develops hands-on in Java and Scala, designs scalable on-premises and cloud solutions, partners with trading and operations teams, and guides regional developers. Owns requirements, architecture, testing, deployment, production support, engineering standards, risk management, and application modernization while ensuring reliable delivery of business-critical systems.

Build and deliver innovative web and digital consumer experiences through hands-on frontend development. Collaborate with multidisciplinary teams to architect, design, estimate, prototype, implement, and maintain client solutions. Apply modern coding practices, solve complex problems independently, document processes, mentor or educate teammates, and contribute ideas across technology, design, strategy, production, and client services.

Build and operate high-scale backend, platform, data, and ML infrastructure for Auxia’s agentic AI platform. Responsibilities may include Kubernetes infrastructure, real-time ingestion, Kotlin and gRPC microservices, recommendation engines, model serving, developer tooling, and enterprise integrations. Engineers own systems end to end, including design, deployment, monitoring, and optimization across a multi-tenant, multi-region environment.