React jobs in Tokyo

Design and implement architecture for ERP systems, optimize performance, and support requirements definition.

Build an LLM-based sales product, implementing AI features, architecture, integrations, and quality improvements with a cross-functional team. Remote work is available.

AI-driven Tech Lead role focused on architecture and technology advancement, serving as a core member in launching Exa Frontier Edge, a new AI-native SI company.

Build AI Worker VoiceAgent’s web frontend, designing visual interfaces and admin features, selecting architecture, and delivering releases with TypeScript and React in a hybrid office/home role.

Build web applications and AI agents to solve customer and business problems, working across frontend, backend, and infrastructure from problem discovery through operation and ongoing improvement.

Owns architecture and end-to-end delivery for a pharmacy inventory AI product, working across backend, AWS infrastructure and React while guiding technical decisions, integrations and development practices.

Lead backend-focused development of Akerun Digital ID, a multi-tenant SaaS. Define requirements, design and implement web applications, select technologies, and maintain the service.

Lead customer projects for major Japanese companies from scope and architecture through data pipelines, implementation, rollout and operations, coordinating departments. Remote work is available.

Design and operate reliable payment and financial systems, covering transaction integrity, recovery, compliance, cloud infrastructure, and new financial products. The role requires 5+ years of web application experience and leadership across multiple technical domains.

Lead a team of engineers, manage technical decisions, and balance technical debt with new feature development.

Manage the Application Platform team supporting BUYMA development teams with backend modernization, microservices, SRE practices, cloud scalability, and AI-assisted development.

Leads product planning and hands-on development for DX SaaS and AI systems, using field research to shape product vision, roadmaps, prioritized features and ongoing improvements.

Leads development across backend/API and frontend for a used-smartphone buying service, strengthening transaction reliability, partner integrations, and product-wide technical direction.

Improves security across web products and cloud infrastructure, managing vulnerabilities and CI/CD checks while partnering with engineers on risk reviews, remediation, and incident readiness.

As a Full Stack Engineer, you will design, implement, and operate core functions of the product, focusing on both backend and frontend development.

Lead new-business product development with a product manager, shaping MVPs, managing quality, cost and schedule through release, building the team, and guiding technical decisions.

Lead customer-specific software projects for major Japanese companies, covering requirements, architecture, data pipelines, implementation, deployment, and operations. Remote work is available.

Lead AI-centered software architecture and development at STORES, building agent-driven development environments, improving products, and guiding high-difficulty projects across applications, infrastructure, and teams.

Design and operate commercial real-estate software covering real-time data integration, domain modeling, AI/LLM features, security, and rapid product development. Remote work is available.

Leads engineering teams for BUYMA, a cross-border C2C marketplace, coordinating development, architecture, process improvement, people management, and cross-functional projects.

Develops frontend features for online consultation and clinic-DX services, covering implementation, testing, reviews, releases and process improvements across a healthcare platform.

Senior security engineer joining the SRE team to secure products through penetration testing, application and AI security, automated controls, and audit support.

Full-stack engineer at air-mobility startup AirX, building its inventory, reservation, flight-operations or flight-control systems with Rails, Node.js/TypeScript, Elixir and React.