Top Software Engineer Jobs in Yokohama

Develop and maintain automated tests for frontend applications, backend services, REST APIs, and GraphQL APIs. Execute functional, regression, integration, and end-to-end testing; validate APIs with Postman; document defects in Jira; and collaborate with development, product, and QA teams. The role also supports test data, environments, CI/CD quality checks, code reviews, test planning, and continuous improvement of quality processes.

Build and scale an enterprise AI Workspace through responsive React applications, Node.js and Python backend services, Azure deployment, enterprise authentication, AI integrations, and secure CI/CD practices. Create Power BI dashboards, data models, DAX measures, and Power Query transformations, while integrating reports with enterprise applications. Collaborate in Agile, DevOps-oriented global teams to deliver scalable, maintainable software and actionable business intelligence.

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.

Architect and build mission-critical broker-dealer middle- and back-office systems for account management, KYC/AML, buying-power and margin controls, ledgers, clearing, settlement, custody, reconciliation, and regulatory reporting. Serve as the founding technical lead for Singapore and Southeast Asia by leading recruitment, market integrations, mentoring, architecture, incident response, and operational reliability. Partner with regional stakeholders and regulators while extending systems for local languages, currencies, and regulations.

Design and maintain distributed Lance dataset operations, develop high-performance indices and data formats, and improve query performance across Spark, Ray, and Trino. Contribute Rust-based table formats and encodings, integrate Lance with major open-source data infrastructure systems, operate internal data processing infrastructure, and promote the project through open-source communities and conferences.

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.

Architect and lead large-scale cloud networking and security platforms across multicloud and hybrid environments. Own routing, NAT, firewall, control-plane, and data-plane architecture from design through production. Lead cross-team initiatives, improve reliability and performance, mentor engineers, support recruiting, participate in on-call, and serve as a senior technical contact for key customers. Develop networking services using Python or Go and guide complex technical decisions involving BGP, traffic steering, distributed systems, and zero-trust security.

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.

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.

Design, build, and optimize scalable LINE messaging services, LIFF applications, and LINE MINI Apps on AWS. Develop product features and internal tools, integrate with an advertising platform, translate business needs into technical solutions, and improve ecosystem performance. The role requires collaboration across Japan and the United States, strong software engineering fundamentals, and business-level Japanese and English communication.

Build and scale Base360.ai’s short-term rental platform, including customer-facing applications, APIs, automation engines, AI-powered workflows, third-party integrations, and cloud infrastructure. Develop systems for reservations, pricing, payments, guest communication, property operations, reporting, and financial workflows. Own projects end to end, make architectural decisions, ensure reliability, and deliver scalable products in a remote-first startup environment.

Lead the design, development, testing, and implementation of embedded software for automotive radar ECUs. Manage software project scope, timelines, resources, development planning, configuration management, risk mitigation, and stakeholder communication. Collaborate with hardware, systems, and validation teams while ensuring compliance with automotive standards. Mentor team members and provide technical leadership across software development projects.

Develop, optimize, and deploy AI applications on customer silicon; provide technical training and support; reproduce and resolve pre- and post-silicon software issues; build benchmarks and proofs-of-concept; collaborate with R&D for fixes and performance tuning; create documentation and customer-facing collateral.

Design, build, and maintain scalable, high-availability brokerage systems for Japan. Develop backend microservices, APIs, financial integrations, and middle- and back-office systems supporting multi-currency transactions, accounting, settlement, and Japan-specific regulations. Collaborate with global engineering teams and Japanese regulators, vendors, and partners; translate requirements into technical solutions. Participate in incident response, on-call rotations, architecture, mentoring, recruitment initiatives, and regional engineering projects.

Own HUD’s production infrastructure and backend platform systems, focusing on reliability, scalability, performance, cost, deployment safety, and developer experience. Build AWS infrastructure with Terraform and Kubernetes, improve CI/CD and observability, design resilient services and asynchronous systems, manage incidents, and develop internal automation and tooling. The role supports high-availability AI, marketplace, and data-heavy workloads.

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.

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 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.

Installs, upgrades, and provides technical support for KD/ACE enterprise software products. Manages beta deployments and customer product adoption projects, supports headquarters and business units, and develops customized Python scripts. Requires Oracle and PL/SQL, Linux administration, shell scripting, programming in C, C++, Python, or Perl, enterprise application maintenance, software documentation, problem-solving, and business-level Japanese and English.

Build and maintain hardened Ubuntu-based container images and the automated CI/CD pipelines to build, test, scan, sign, publish, and retire them. Integrate upstream open-source projects, ensure security and cloud-native compatibility, collaborate with cross-functional teams, document and share knowledge, mentor colleagues, and contribute to hiring. Work in a distributed agile environment with occasional travel.

Collaborate with engineers to extend compiler/toolchain for high-performance ML model deployment on AI hardware. Requires significant software engineering experience and knowledge of ML.

Canonical seeks open-source enthusiasts to optimize Ubuntu for new silicon technologies, collaborating with teams and customers to enhance software quality and performance across various platforms.

Develop, commission, configure, and support software systems integrated with industrial equipment. Diagnose hardware/software issues, manage industrial communication protocols and fieldbus systems, train customers and teams, ensure compliance with standards, and perform on-site commissioning and support.