Senior Frontend Engineer, BSS Platform

At BSS Development Department (BSDD), we are managing and evolving the Business Support Systems (BSS) platform, a critical backbone of Rakuten Mobile services.

The main functions that BSS provides are: end-customer touchpoints (front-ends, mobile applications for onboarding and for plan management), billing and integration with the core systems of Rakuten Mobile.

Our mission is to provide a unified BSS platform that spans across the different business lines of our telecommunication businesses.

Having just finished the initial build-up phase of the platform, we are actively looking for talented individuals to make our organization and platforms stronger with teams spanning Japan, India, China, and Singapore.

・Customer-facing frontend applications and mobile apps (onboarding, plan management, My Rakuten Mobile)

・Billing and charge management systems

・Order management and provisioning workflows

・Integration layers connecting BSS with Rakuten Mobile's core network and third-party systems

With the BSS platform now entering a sustained growth and optimization phase, we are expanding our team of engineers who can take deep technical ownership of customer-facing frontend applications. As user expectations and UI complexity grow, we need Senior Frontend Engineers who can independently drive the design and delivery of sophisticated frontend features, elevate interface quality across the team, and serve as technical anchors in cross-functional squads.

This role is central to ensuring the usability, performance, and reliability of applications used by millions of Rakuten Mobile subscribers.

・Design, develop, and maintain high-performance, production-grade frontend applications for BSS platform domains including subscriber self-service portals, onboarding flows, plan management, and internal operational tools

・Lead technical design (HLD/LLD) for new UI features and system enhancements, ensuring alignment with platform architecture and UX standards

・Conduct thorough code reviews and uphold engineering quality across the team

・Collaborate closely with product managers, UX/UI designers, QA engineers, backend engineers, and counterpart teams across global offices to deliver end-to-end features

・Diagnose and resolve complex frontend production issues, contributing to root cause analysis and long-term systemic fixes

・Mentor junior and mid-level engineers through design reviews, pair programming, and technical guidance

・Contribute to CI/CD pipeline improvements, frontend observability tooling, and DevOps best practices

・Participate in cross-team architecture discussions and help drive platform-level frontend technical decisions

・Champion accessibility, responsive design, and cross-browser compatibility standards across the team

・Global distributed team across Japan, India, China, and Singapore

・Agile/Scrum development with two-week sprint cycles

・English as the primary working language for documentation, design discussions, and cross-site communication

・Modern tech stack: React/TypeScript-based single-page applications, containerized on Kubernetes, deployed on cloud infrastructure

・Strong emphasis on engineering craftsmanship: code review culture, automated testing, and continuous delivery