Company CIO Office : Application Development Engineer (CIOO)

Tokyo, JapanFull-time2026-06-24 → 2026-11-10

On-site · Japan

Core

Designing and implementing IT system solutions to support Rakuten Mobile's corporate strategy and operational efficiency using AI.

Role type

Senior Application Development Engineer

Builds

Enterprise IT systems and AI-driven operational tools for Rakuten Mobile

Domain

Telecommunications / Enterprise IT / AI

Deliverable

production ML models | product features

Required skills

Java, Python, JavaScript, system architecture, project lifecycle management, vendor management

Preferred skills

iOS/Android development, QA/QC, database management, infrastructure knowledge

Technologies

Java, Python, JavaScript, SaaS platforms

Responsibilities

Conceptualize system solutions based on business challenges, lead design and development phases, manage development vendors

Seniority

Mid-career to Senior, hands-on IC

About Rakuten

Rakuten was founded in 1997, and Rakuten Ichiba has continued to embody Rakuten's mission of "empowering people and society through innovation." It has created a system that allows people with strong commercial skills to easily open stores beyond the limits of their physical business area, delivering the joy of shopping to users throughout Japan.