Company CIO Office : Application Development Engineer (CIOO)

Job Description: Department Overview

The IT Governance Department is a newly established organization, launched in June 2025 under the direct lead of Rakuten Mobile's CIO. Its core mission is to address various issues related to IT systems and information assets by developing IT strategies and governance frameworks and subsequently implementing the necessary system developments.

From the perspective of Rakuten Group's Communications & Energy Company, this department is undertaking a highly significant initiative to establish corporate governance across Rakuten Mobile.

Furthermore, we foster a culture that values each employee's ideas and encourages proactive challenges.

The IT Development Section is responsible for the planning, system development, and operation necessary to realize our company-wide IT strategy.

Team members will be involved from the initial planning stages, participating in all phases of system development, from upstream conceptualization to downstream implementation.

Furthermore, we actively incorporate the latest technologies into our development efforts, including planning and development aimed at promoting the internal use of AI.

Position: Why We Hire

We are significantly strengthening our organizational structure to realize Rakuten Mobile's IT strategy. This includes addressing various challenges that arise in business promotion and developing systems to improve operational efficiency using AI.

Position Details

You will be responsible for conceptualizing system solutions by carefully considering appropriate responses to challenges raised by various departments within Rakuten Mobile.

As a developer, you will be involved in all phases of the project, from upstream to downstream, including design, development, and development vendor control, based on these conceptualized plans.

Work Environment

Currently, the entire department consists of 24 members, with 4 in this section. However, we plan a significant expansion of the entire organization, including other sections, in the near future.

Our existing team is primarily composed of mid-career hires, many with backgrounds in telecommunications carriers.

While development is currently conducted on a SaaS platform, we plan to establish development environments tailored to future development needs.

Mandatory Qualifications:

• 5+ years of experience in application development (implementation) using languages such as Java, Python, and JavaScript
• Experience in IT system construction
• Ability to proactively identify issues and take action to resolve them

Desired Qualifications:

• Experience in mobile application (iOS/Android) development
• Experience in QA (Quality Assurance) and QC (Quality Control)
• Knowledge of databases (DB) and infrastructure

Other Information: Additional information on Location

Rakuten Crimson House (Head office)

Additional information on Secondment

Although your official affiliation will be with Rakuten Group's Company CIO Office, you will operate as a member of Rakuten Mobile's CIO Office, focusing on initiatives and support for Rakuten Mobile

Additional information on English Qualification

Proficiency in English sufficient for coordination with relevant departments is desirable

Proficient in English, native level or TOEIC (or equivalent) score 800+

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