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Salary
≈ $63k – $130k per year (Estimated)
Location
Hybrid (Chiyoda, Japan)
Seniority
Staff
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 17, 2026. First seen by Alion on Jun 8, 2026. Third Intelligence scores A on the Alion truth index.

Overview
Company
Impact
Profile match
Third Intelligence is a Japanese AI research and product development company working toward artificial general intelligence. It pursues a concept it calls ubiquitous AGI that grows with each user, and hires software engineers, AI product managers, product designers and business development staff. The company is based in Chiyoda, Tokyo, Japan.

Product - 04. Staff Software Engineer - Backend

Description

# 会社について

Third Intelligenceは、日本発のAGIの確立に挑戦する、AI研究・プロダクト開発企業です。Third Intelligenceが独自に提唱する「遍在型AGI(汎用人工知能)」の確立と個人に寄り添ったその成長を通じて、社会の新たな基盤となるサービスの実現を目指します。

[Third Intelligence Company Deck](https://speakerdeck.com/thirdintelligence/third-intelligence-company-deck)(別タブで開きます)

私たちは、2つの事業を展開しています。

1つは、日本発の汎用人工知能(AGI)の実現。従来のような巨大なモデルを全利用者に一律に提供するのではなく、利用者に合わせて独自に成長する「遍在型AGI」の実現を目指しています。

もう1つは、遍在型AGIの特性を活かした生活者向けグローバルプロダクトの構築です。2026年1月に国内最大規模の100億円規模の初回資金調達を完了し、博報堂DYグループとの資本業務提携を経て、研究開発並びにプロダクト開発を加速しています。

# ポジションについて

## ポジションの意義・背景

複雑なAIプロダクト基盤を支えるバックエンド全体のアーキテクチャ設計と技術的な卓越性を牽引するポジションです。単一の機能開発に留まらず、グローバルスケールでの信頼性、拡張性などを担保するための標準を定義し、全社的な技術課題の解決にオーナーシップを発揮していただきます。AI研究開発組織が創り出す最先端のアルゴリズムを、確かなプロダクト品質でデリバリーするためのシステム基盤を構築する重要な役割を担います。

## 業務内容・期待成果

- グローバル展開に耐えうる高可用性かつ高スケーラブルなバックエンドシステムの全体アーキテクチャ設計と技術選定の主導

- システム全体におけるパフォーマンスのボトルネックや技術的負債を特定し、根本的な解決に向けた高難度の実装およびリファクタリングの遂行

- エンジニアリング組織全体の生産性を向上させるための、共通基盤、CI/CDパイプライン、および開発プロセスの標準化と自動化の推進

- チーム内のシニアエンジニアや若手エンジニアに対するメンタリング、およびコードレビューを通じた技術水準の底上げとエンジニアリング文化の醸成

### 主な技術スタック・開発環境・ツール

- ツール: GitHub / Slack / Notion / Figma

- AIツール: Claude Code, Cursor, ChatGPT, Gemini, Grok

- 技術スタック・開発環境など: TypeScript / React / vite / Swift / Kotlin / Go / Python / AWS / Datadog

## ポジションの魅力

- 研究開発とプロダクトを接続する最難関のシステム課題に対し、技術選定から実装まで極めて大きな裁量を持って取り組めます。

- 少数精鋭のトップタレントが集う組織において、自らの設計判断がプロダクトの命運と会社の成長に直接影響を与える手応えがあります。

- 既存の枠組みに縛られず、常に最新の技術トレンドを取り入れながら、エンジニアリング組織の文化そのものを創り上げる醍醐味があります。

---

# About the Company

Third Intelligence is an AI research and product development company taking on the challenge of establishing AGI originating from Japan. Through the establishment of "Ubiquitous AGI (Artificial General Intelligence)"-a concept uniquely proposed by Third Intelligence-and its growth tailored to each individual, we aim to realize services that become a new foundation for society.

[Third Intelligence Company Deck](https://speakerdeck.com/thirdintelligence/third-intelligence-company-deck) (opens in a new tab)

We are pursuing two lines of business. The first is the realization of Artificial General Intelligence (AGI) originating from Japan. Rather than providing a single massive model uniformly to all users, we aim to create "Ubiquitous AGI" that grows and adapts independently for each individual user. The second is the development of a global consumer platform leveraging the unique characteristics of Ubiquitous AGI. In January 2026, we completed one of Japan's largest initial funding rounds of approximately ¥10 billion, and through a capital and business alliance with the Hakuhodo DY Group, we are accelerating both our cutting-edge AI research and product development.

## Significance & Background

This position leads the overall backend architecture design and technical excellence underpinning our complex AI product platform. Going beyond individual feature development, you will define standards to ensure reliability and scalability at a global scale, and take ownership of resolving company-wide technical challenges. You will play a critical role in building the system infrastructure that delivers cutting-edge algorithms created by our AI R&D organization with proven product quality.

## Responsibilities & Expected Outcomes

- Lead overall architecture design and technology selection for highly available and scalable backend systems capable of global deployment

- Identify performance bottlenecks and technical debt across the entire system, and execute high-complexity implementations and refactoring toward fundamental solutions

- Drive standardization and automation of shared infrastructure, CI/CD pipelines, and development processes to improve productivity across the engineering organization

- Mentor senior and junior engineers, and elevate technical standards and engineering culture through code reviews

### Key Technology Stack / Development Environment / Tools

- Tools: GitHub / Slack / Notion / Figma

- AI Tools: Claude Code, Cursor, ChatGPT, Gemini, Grok

- Tech Stack: TypeScript / React / Vite / Swift / Kotlin / Go / Python / AWS / Datadog

## What Makes This Position Attractive

- You will have exceptional autonomy-from technology selection to implementation-to tackle the most challenging system problems at the intersection of R&D and product.

- In an elite organization of top talent, your architectural decisions will directly impact the product's fate and the company's growth.

- You will have the unique opportunity to shape the engineering culture itself, continuously adopting the latest technology trends without being bound by existing frameworks.

Requirements

# 会社について

Third Intelligenceは、日本発のAGIの確立に挑戦する、AI研究・プロダクト開発企業です。Third Intelligenceが独自に提唱する「遍在型AGI(汎用人工知能)」の確立と個人に寄り添ったその成長を通じて、社会の新たな基盤となるサービスの実現を目指します。

[Third Intelligence Company Deck](https://speakerdeck.com/thirdintelligence/third-intelligence-company-deck)(別タブで開きます)

私たちは、2つの事業を展開しています。

1つは、日本発の汎用人工知能(AGI)の実現。従来のような巨大なモデルを全利用者に一律に提供するのではなく、利用者に合わせて独自に成長する「遍在型AGI」の実現を目指しています。

もう1つは、遍在型AGIの特性を活かした生活者向けグローバルプロダクトの構築です。2026年1月に国内最大規模の100億円規模の初回資金調達を完了し、博報堂DYグループとの資本業務提携を経て、研究開発並びにプロダクト開発を加速しています。

# ポジションについて

## ポジションの意義・背景

複雑なAIプロダクト基盤を支えるバックエンド全体のアーキテクチャ設計と技術的な卓越性を牽引するポジションです。単一の機能開発に留まらず、グローバルスケールでの信頼性、拡張性などを担保するための標準を定義し、全社的な技術課題の解決にオーナーシップを発揮していただきます。AI研究開発組織が創り出す最先端のアルゴリズムを、確かなプロダクト品質でデリバリーするためのシステム基盤を構築する重要な役割を担います。

## 業務内容・期待成果

- グローバル展開に耐えうる高可用性かつ高スケーラブルなバックエンドシステムの全体アーキテクチャ設計と技術選定の主導

- システム全体におけるパフォーマンスのボトルネックや技術的負債を特定し、根本的な解決に向けた高難度の実装およびリファクタリングの遂行

- エンジニアリング組織全体の生産性を向上させるための、共通基盤、CI/CDパイプライン、および開発プロセスの標準化と自動化の推進

- チーム内のシニアエンジニアや若手エンジニアに対するメンタリング、およびコードレビューを通じた技術水準の底上げとエンジニアリング文化の醸成

### 主な技術スタック・開発環境・ツール

- ツール: GitHub / Slack / Notion / Figma

- AIツール: Claude Code, Cursor, ChatGPT, Gemini, Grok

- 技術スタック・開発環境など: TypeScript / React / vite / Swift / Kotlin / Go / Python / AWS / Datadog

## ポジションの魅力

- 研究開発とプロダクトを接続する最難関のシステム課題に対し、技術選定から実装まで極めて大きな裁量を持って取り組めます。

- 少数精鋭のトップタレントが集う組織において、自らの設計判断がプロダクトの命運と会社の成長に直接影響を与える手応えがあります。

- 既存の枠組みに縛られず、常に最新の技術トレンドを取り入れながら、エンジニアリング組織の文化そのものを創り上げる醍醐味があります。

---

# About the Company

Third Intelligence is an AI research and product development company taking on the challenge of establishing AGI originating from Japan. Through the establishment of "Ubiquitous AGI (Artificial General Intelligence)"-a concept uniquely proposed by Third Intelligence-and its growth tailored to each individual, we aim to realize services that become a new foundation for society.

[Third Intelligence Company Deck](https://speakerdeck.com/thirdintelligence/third-intelligence-company-deck) (opens in a new tab)

We are pursuing two lines of business. The first is the realization of Artificial General Intelligence (AGI) originating from Japan. Rather than providing a single massive model uniformly to all users, we aim to create "Ubiquitous AGI" that grows and adapts independently for each individual user. The second is the development of a global consumer platform leveraging the unique characteristics of Ubiquitous AGI. In January 2026, we completed one of Japan's largest initial funding rounds of approximately ¥10 billion, and through a capital and business alliance with the Hakuhodo DY Group, we are accelerating both our cutting-edge AI research and product development.

## Significance & Background

This position leads the overall backend architecture design and technical excellence underpinning our complex AI product platform. Going beyond individual feature development, you will define standards to ensure reliability and scalability at a global scale, and take ownership of resolving company-wide technical challenges. You will play a critical role in building the system infrastructure that delivers cutting-edge algorithms created by our AI R&D organization with proven product quality.

## Responsibilities & Expected Outcomes

- Lead overall architecture design and technology selection for highly available and scalable backend systems capable of global deployment

- Identify performance bottlenecks and technical debt across the entire system, and execute high-complexity implementations and refactoring toward fundamental solutions

- Drive standardization and automation of shared infrastructure, CI/CD pipelines, and development processes to improve productivity across the engineering organization

- Mentor senior and junior engineers, and elevate technical standards and engineering culture through code reviews

### Key Technology Stack / Development Environment / Tools

- Tools: GitHub / Slack / Notion / Figma

- AI Tools: Claude Code, Cursor, ChatGPT, Gemini, Grok

- Tech Stack: TypeScript / React / Vite / Swift / Kotlin / Go / Python / AWS / Datadog

## What Makes This Position Attractive

- You will have exceptional autonomy-from technology selection to implementation-to tackle the most challenging system problems at the intersection of R&D and product.

- In an elite organization of top talent, your architectural decisions will directly impact the product's fate and the company's growth.

- You will have the unique opportunity to shape the engineering culture itself, continuously adopting the latest technology trends without being bound by existing frameworks.

Preferred Experiences

- マイクロサービスアーキテクチャや、分散システムにおける高可用性設計の経験

- 数十億規模のリクエストを処理するシステムのリアーキテクチャ、またはマイグレーションの主導経験

- 高負荷なAI推論パイプラインや大規模データ処理基盤の最適化に関する深い知見

- グローバル市場へのプロダクトローンチを、エンジニアリングサイドから主導した経験

- OSSコミュニティへの貢献、または技術カンファレンスでの登壇実績を通じたプレゼンス

---

- Experience with microservices architecture and high-availability design in distributed systems

- Experience leading re-architecture or migration of systems processing billions of requests

- Deep knowledge of optimizing high-load AI inference pipelines and large-scale data processing infrastructure

- Experience leading product launches for global markets from the engineering side

- Presence through contributions to the OSS community or speaking at technical conferences

We are looking for

Working Conditions

Salary

応相談

※ストック・オプション制度有‬‭

---

Negotiable *Stock option plan available

Location

101-0052 東京都千代田区神田小川町1丁目4 WORK VILLA MYJ KANDA 11F

地方からフルリモートOK。

ただし毎週、月曜日・金曜日は出社推奨日、かつ月1回のAllHands出社が必要(交通費支給)

---

Full remote work from anywhere in Japan is welcome.

However, Mondays and Fridays are recommended in-office days, and monthly All-Hands attendance is required (transportation expenses covered).

Office:

101-0052

WORK VILLA MYJ KANDA 11F, 1-4 Kanda Ogawamachi, Chiyoda-ku, Tokyo

Job Type

正社員 / Full-time (permanent)

Work hours

- 専門型裁量労働制 または、フルフレックス(所定労働時間 8時間‬、45時間分の固定残業代あり。超過分は別途支給)

- 休日:土・日、祝日、年末年始 等

- 入社時に特別休暇を3日付与(有効期限半年)、その後6ヶ月勤務後から最低10日〜最大20日の年次有給休暇を付与

- ほか特別休暇あり(慶弔休暇、アニバーサリー休暇など)

- 加入保険:雇用保険・労災保険・健康保険・厚生年金‬

---

- Specialized discretionary labor system or Full flextime (standard working hours: 8 hours/day, with fixed overtime pay for 45 hours included; overtime beyond that is paid separately)

- Holidays: Saturdays, Sundays, national holidays, year-end & New Year holidays, etc.

- 3 days of special leave granted upon joining (valid for 6 months), followed by 10-20 days of annual paid leave after 6 months of service

- Additional special leave available (bereavement leave, anniversary leave, etc.)

- Insurance: Employment insurance, workers' compensation, health insurance, employees' pension

Probation period

3ヶ月 / 3 months

Benefits

## For Productivity

- フルフレックスタイム制 or 裁量労働制

- ハイブリッドワーク

- 東京移住時の引越補助

- 利用端末のスペック選択

- ガジェット補助

- 各AIツールの導入推進

---

- Flexible working hours (full flextime system)

- Hybrid work model

- Relocation support for moving to Tokyo

- Choice of preferred work device specifications

- Gadget subsidy for productivity tools

- Company-wide promotion of AI tool adoption

## For Growth

- 書籍購入補助

- 海外カンファレンス参加補助

- MOOCs受講補助

- 英語・日本語学習支援

- 松尾研講座の受講補助

---

- Book purchase support

- Financial assistance for attending overseas conferences

- Subsidy for online courses (MOOCs)

- English/Japanese learning support

- Access to Matsuo Laboratory educational programs

## For Communication

- チームビルディング目的の食事補助

- オフサイト補助

- Monthly All-Handsの実施(フルリモートも交通費補助)

- フリードリンク、フリースナック

---

- Meal subsidies for team-building purposes

- Offsite event support

- Monthly All-Hands meetings (travel expenses covered for remote members)

- Free drinks and snacks in the office

## For Life Plan

- エッグフリージング補助・支援

- 今後導入予定(変更となる可能性があります)

- 学費ローンの代理返済

- 確定拠出年金

---

- Egg freezing support and financial assistance

- Planned for future introduction (subject to change)

- Company-sponsored student loan repayment program

- Defined Contribution Plan

## For Family

- ベビーシッター/病児シッター補助

- 看護・介護休暇

- アニバーサリー休暇

- 産休・育休・時短勤務歓迎

- 希望に応じて育休中の1:1実施

---

- Babysitting and sick child care subsidies

- Family care and nursing leave

- Anniversary leave

- Parental leave and flexible working hours for caregivers

- Optional one-on-one check-ins during parental leave

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