楽天グループ株式会社：1021866 Senior Systems Engineer (MVNE Service) – Enterprise DX Product Management Section, BSS Development Department (BSDD)

会社名

楽天グループ株式会社

会社概要

未来を信じ、より良い明日を創っていく。
イノベーションを通じて、人々と社会をエンパワーメントする。私たちは、そんな想いを大切に世界の人々に喜びと楽しさを届けます。
楽天は、E コマース、FinTech、デジタルコンテンツ、通信など、70 を超えるサービスを展開し、世界10 億以上のユーザーに利用されています。
これら様々なサービスを、楽天会員を中心としたメンバーシップを軸に有機的に結び付け、他にはない独自の「楽天エコシステム」を形成しています。ダイバーシティ推進は、楽天にとって最優先の企業戦略のひとつです。従業員の出身は70カ国・地域以上。世界中からユニークで多様な文化的背景や視点を持つ優秀な人材が集まり、イノベーションの原動力になっています。社内カフェテリアにはベジタリアン、ハラル対応のメニューを用意。礼拝所（Prayer room）もあります。
また、仕事と育児の両立支援や、障がい者雇用・活躍促進も積極的に推進。社内のLGBT（※1）当事者やアライ（※2）に対して、情報共有やサポート体制の強化も進めています。誰もが自分らしく力を最大限発揮して働ける。それが楽天のダイバーシティです。

70を超えるサービスを提供し、世界30カ国にサービス展開拠点を持ち、従業員の出身国・地域数は100を超え、オープンポジション制度を活用して多様なキャリアを描くことができる点も魅力です。
フレックスタイム制度、事情に応じたリモートワークの活用が可能です。本社には託児所やフィットネスジム、三食無料で利用可能なカフェテリアが併設されるなど、社員を支える環境が整備されています。

ポジション

1021866 Senior Systems Engineer (MVNE Service) - Enterprise DX Product Management Section, BSS Development Department (BSDD)

仕事内容

Job Description:
Business Overview
The Technology Platforms Division (TPD) is responsible for building and operating the infrastructure and ecosystem platforms which power the Rakuten Group, Inc.
Our mission is to provide our Rakuten Cloud and Ecosystem Platforms which will deliver Core Value to accelerate the growth of Rakuten Group, Inc. services.

Department Overview
Our department, BSS Development Department (BSDD) , develops and maintains the BSS platform for MNO, VOICE, and ISP services, and is in charge of development and maintenance of IT infra (on-premise and cloud environment) for BSS platform.

Position:
Why We Hire
The 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 Details
As 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.

求める経験・スキル

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.

Additional information on Language
Business-level fluency in Japanese & English