Top Software Engineer Jobs in Japan

As a Senior iOS Engineer at Speechify, you will lead engineering and product decisions, actively ship production code, and contribute to product discussions while maintaining and enhancing app architecture.

The role involves enhancing data ingestion pipelines by sourcing audio data, managing cloud infrastructure on GCP, and collaborating with the AI team to optimize dataset creation for model training.

Build and maintain engineering tools, infrastructure, and practices to improve reliability, traceability, and maintainability of mission-critical software. Automate and standardize workflows, develop internal libraries and data pipelines, package reusable tools, define GitLab/Git and CI/CD best practices, support CI/CD troubleshooting and onboarding, and enable automated documentation and long-term tool maintenance.

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.

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.

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.

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 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.

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.

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.

The Software Engineer will enhance data collection methods for machine learning, manage cloud infrastructure, and collaborate with AI scientists to improve data quality and efficiency.

The Software Engineer will be responsible for data collection to support model training, manage data ingestion pipelines, and collaborate with AI team members on data strategy.

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.

Build high-performance, scalable React+TypeScript web applications for payment experiences. Design reusable UI components and optimize frontend performance while collaborating with cross-functional teams on architecture, testing, accessibility, and product delivery.

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.

Early-career software engineer in a fixed-term accelerator: develop and maintain core products, compile and implement interface documentation, troubleshoot QA issues, and assist customer support to classify and resolve customer problems for system improvement.

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.