In-house Product | Web Application Engineer - Develop AX Products for In-house and Major Clients - Lead Development Units and Proactively Solve Team ChallengesEnglish summary from Japanese

株式会社オプティム

✓ Detailed

Salary

570-830万円

Location

＜勤務地＞東京都港区海岸1丁目2番20号　汐留ビルディング18F ※リモート：可（週3日以上出社、週2日リモート）（変更の範囲）会社の定める事業所

Job Type

Full-time

Work Style

・休憩時間：1時間・平均残業時間：20時間（2026年7月時点）

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Role summaryEnglish summary from Japanese

English summary for screening — check the original posting before applying.

Develop backend systems for in-house products like OPTiM Biz and client-facing AX/DX products. You will lead architectural design, API development, and database optimization, contributing to Japan's core industries through AI and IoT.

Must-haves

Experience in backend (server-side) architecture design, API development, or database optimization.
Willingness to be assigned to tasks based on your experience and desired technologies (Go, Java, Python, Ruby on Rails, etc.).

Nice-to-haves

Experience with AI/LLM tools (ClaudeCode, Codex, etc.).
Experience with frontend technologies (TypeScript, React, Next.js, Vue.js).
Experience with mobile/client application development (Swift, Kotlin, Objective-C, etc.).
Experience with cloud platforms (AWS, Azure) and infrastructure tools (Terraform, Docker, Podman).

Tech stack

GoJavaPythonRuby on Rails

About the Company

株式会社オプティム

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Posted7/9/2026

Updated2026-07-12 23:31:27