Senior Systems Engineer (MVNE Service) - Enterprise DX Product Management Section, BSS Development Department (BSDD)

Job DescriptionBusiness OverviewThe Technology Platforms Division (TPD) drives the growth of Rakuten's ecosystem by delivering innovative, high-quality technology platforms characterized by integrated control and strategic partnerships.Within TPD, the Cloud Platform Supervisory Department (CPSD) develops and manages Rakuten's state-of-the-art cloud platform, empowering global scalability and accelerating innovation across its diverse business units.Department OverviewAt 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.Just as Rakuten Mobile has disrupted the mobile industry, we're committed to delivering exceptional value to our business partners and end customers by seamlessly leveraging the wide Rakuten Ecosystem. With a long history of software engineering as a service company providing social infrastructure, we value the speed and quality of our delivery to maximize customer satisfaction.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.PositionWhy We HireThe Enterprise DX Product Management Section smoothly and reliably provides low-price, high-quality services to many customers through the development and operation of information systems (BSS: Business Support System), the provision of enterprise MVNE services, and voice services. We are continuing to build and develop systems for delivery and use, and as a start-up established 3 years ago, we are looking for more team members to help our business expand further. It is expected that this Systems Engineer will develop their career to lead a team of Business Analysts in the future.Position DetailsAs a Systems Engineer for MVNE services, your responsibilities will be as follows:Manage BSS releases Discuss and gather business requirements and transform them into BSS component/system requirements, to create a Change Request (CR). Create process/sequence diagram to explain requirements.Analyze the impact of business requirements along with BSS Engineering (design/dev/QA) team. Review design documents and give sign-off for further development and testing. Ensure business requirements are delivered as per the actual ask, meet.Telecom Industry BSS standards, and own the CR end-to-end.Prepare and coordinate the next MVNO onboarding for BSS Discuss comprehensively with all parties, planning and clarifying onboarding requirements. Participate in planning with external/internal stakeholders (scope, design, timelines, deliverables, risks/mitigations, etc., but not budget planning).Support existing customer maintenance and system failures for closure BSS release test support and release support. Support Ops and QA from a technical perspective. Review SIT, UAT, production sanity test cases for every release. Support security testing process. Support product quality process.Mandatory Qualifications 7+ years of experience as a System Engineer or Technical Lead in the design, development, and integration of enterprise systems, with demonstrated leadership or mentorship responsibilities. Proven ability to lead technical discussions, guide development teams, and provide technical oversight for the implementation of complex solutions. Strong background in telecommunications BSS environments, including understanding of key modules (e.g., CRM, Billing, Provisioning). Excellent communication and interpersonal skills to effectively collaborate with cross-functional teams and stakeholders.Desired Qualifications Demonstrable experience with API-first design principles and practical application of REST/SOAP for system integration. Advanced SQL skills and hands-on experience with Oracle Database for performance tuning, schema design, and complex data retrieval.Other InformationAdditional information on LocationTokyo OfficeAdditional Information On LanguageBusiness-level fluency in Japanese & English#engineer #applicationsengineer #technologyplatformdiv #RakutenMobileLanguagesEnglish (総合 - 3 - 上級)、 Japanese (総合 - 4 - 流暢)