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Senior Frontend Engineer, BSS Platform - BSS Development Department (BSDD)

Tokyo, Japan💼 Full-time🗓 2026-09-08 → 2026-09-25

Core

Design, develop, and maintain high-performance, production-grade frontend applications for Rakuten Mobile's Business Support System (BSS), including subscriber self-service portals, onboarding flows, plan management, and internal operational tools.

Role type

Senior Frontend Engineer (BSS Platform)

Builds

Customer-facing web applications and mobile app interfaces for onboarding, plan management, and billing integration.

Domain

Telecommunications / Business Support Systems (BSS)

Deliverable

production ML models | product features

Required skills

React, TypeScript, RESTful API integration, modern CSS (CSS Modules/styled-components), frontend testing (Jest/Vitest, Playwright/Cypress), CI/CD pipelines (Webpack/Vite, GitHub Actions), technical design (HLD/LLD), code review leadership, accessibility standards.

Preferred skills

Micro-frontend architecture, server-side rendering/static site generation (Next.js), frontend observability (Datadog RUM, Sentry), design systems, GraphQL/BFF patterns.

Technologies

React, TypeScript, Kubernetes, Webpack, Vite, GitHub Actions, Jest, Vitest, Playwright, Cypress, Next.js, Datadog RUM, Sentry.

Responsibilities

Lead technical design for new UI features and system enhancements; conduct code reviews and uphold engineering quality; diagnose and resolve complex frontend production issues; mentor junior and mid-level engineers; contribute to CI/CD pipeline improvements and frontend observability tooling; champion accessibility and cross-browser compatibility standards.

Seniority

Senior, hands-on IC with mentorship responsibilities.

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