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Location
Hybrid (Chiyoda, Japan)
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 22, 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 - 02. Applied AI Engineer - BtoC Product

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

優れたAI基盤(プラットフォーム/ハーネス)は、それ自体では価値を生みません。基盤の上で、ユーザーが「Wow」と感じる体験を、圧倒的なスピードで形にしてこそ価値になります。「人はエンジンではなく車を買う」。このポジションは、その車を実際に走らせ、ユーザーの元へ届ける役割です。

本ポジションは、プロダクトサイドで AI 機能を実装し、市場に届けることに責任を持つ Applied AI Engineer です。プラットフォームチーム/ハーネスチームが提供するプリミティブを組み合わせ、プロンプトエンジニアリング、UIの作り込み、ラピッドプロトタイピング、実験のイテレーションを通じて、ユーザー体験を短サイクルで磨き込みます。Third Intelligenceの開発チームが実践する「短いサイクルでプロトタイプを作り、実験で検証し、素早く学ぶ」開発スタイルの中核を担い、AIプロダクトの実際の使い勝手(情報の正確性、タイムセンス、レスポンスの速さ)をプロダクト目線で引き上げていただきます。

## 業務内容・期待成果

- AI機能のプロダクト実装と高速デリバリー

- プラットフォーム/ハーネスのプリミティブを組み合わせ、ユーザー向けのAI機能を短サイクルで実装・リリースする

- プロトタイプ→実験→学習のループを高速に回し、市場からの学びをプロダクトに反映する

- プロンプトエンジニアリングと体験品質の作り込み

- プロンプト設計・検証・改善を通じて、AIの応答品質(正確性・タイムセンス・トーン)をプロダクト水準まで引き上げる

- UIの作り込みとプロンプトの両輪で、モデルの能力をユーザー体験として最大化する

- 実験基盤を活用したデータドリブンな改善

- フィーチャーフラグ・A/B実験・メトリクスを用いて仮説検証を行い、定量データに基づいてイテレーションする

- 実験結果から次の打ち手を定義し、体験の継続的な改善を主導する

- プラットフォーム/ハーネスチームへのフィードバック

- プロダクト実装で得た知見を、必要なプリミティブの要望としてプラットフォーム/ハーネスチームに還元し、基盤の進化をプロダクトドリブンに促す

- 品質基準とAIネイティブな開発プラクティスの実践

- AI生成コードを人間のコードと同等以上の基準で扱い、spec-driven/エージェンティックなワークフローを実務で活用する

## ポジションの魅力

- モデルの能力を「実際のプロダクト体験」に変換する、最もユーザーに近い最前線で、大きな裁量を持ってスピード感高く開発できます。

- 少数精鋭のトップタレント組織の中で、あなたの実装とプロンプト・UIの判断が、ユーザー体験とプロダクトの成否に直接的なインパクトを与えます。

- ラピッドプロトタイピングと実験のループの中で、AIプロダクトの「勝ち筋」を自ら見つけ、形にしていく手応えがあります。

---

# 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

A great AI foundation (platform / harness) creates no value on its own. Value comes from building experiences that make users say "wow" (and building them fast) on top of that foundation. "People don't buy engines, they buy cars," and this role is the one that actually drives the car to the user.

This is an Applied AI Engineer role on the product side, responsible for implementing AI features and shipping them to market. Composing the primitives provided by the platform/harness teams, you will refine user experiences in short cycles through prompt engineering, UI craft, rapid prototyping, and experiment iteration. You will be central to the "prototype, experiment, learn fast" development style practiced by Third Intelligence's engineering teams, raising the real usability of our AI products (information accuracy, time-sense, responsiveness) from a product perspective.

## Responsibilities & Expected Outcomes

- Implement and ship AI features fast: compose platform/harness primitives to build and release user-facing AI features in short cycles; run the prototype → experiment → learn loop quickly and feed market learnings back into the product.

- Craft experience quality via prompt engineering: design, test, and improve prompts to raise AI response quality (accuracy, time-sense, tone) to product standard; maximize model capability as user experience through both UI craft and prompts.

- Data-driven improvement via the experimentation platform: validate hypotheses with feature flags, A/B experiments, and metrics, and iterate on quantitative data; define next moves from experiment results and lead continuous experience improvement.

- Feed back to the platform/harness teams: channel insights from product implementation into requests for needed primitives, driving foundation evolution in a product-driven way.

- Practice quality standards and AI-native development: hold AI-generated code to the same or higher standards as human code and use spec-driven / agentic workflows in practice.

## Tech Stack

- Tools: GitHub / Slack / Notion / Figma

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

- Stack: TypeScript / React / Swift / Kotlin / Python / Go / AWS / Datadog; prompt engineering / LLM API integration / MCP / feature-flag & experimentation infra / rapid prototyping

## What Makes This Position Attractive

- Work at the frontline closest to the user, converting model capability into real product experience, with significant autonomy and speed.

- In an elite organization of top talent, your implementation and your prompt/UI decisions directly impact user experience and the product's success.

- Find and build the "winning path" for an AI product yourself, inside a fast loop of rapid prototyping and experimentation.

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

優れたAI基盤(プラットフォーム/ハーネス)は、それ自体では価値を生みません。基盤の上で、ユーザーが「Wow」と感じる体験を、圧倒的なスピードで形にしてこそ価値になります。「人はエンジンではなく車を買う」。このポジションは、その車を実際に走らせ、ユーザーの元へ届ける役割です。

本ポジションは、プロダクトサイドで AI 機能を実装し、市場に届けることに責任を持つ Applied AI Engineer です。プラットフォームチーム/ハーネスチームが提供するプリミティブを組み合わせ、プロンプトエンジニアリング、UIの作り込み、ラピッドプロトタイピング、実験のイテレーションを通じて、ユーザー体験を短サイクルで磨き込みます。Third Intelligenceの開発チームが実践する「短いサイクルでプロトタイプを作り、実験で検証し、素早く学ぶ」開発スタイルの中核を担い、AIプロダクトの実際の使い勝手(情報の正確性、タイムセンス、レスポンスの速さ)をプロダクト目線で引き上げていただきます。

## 業務内容・期待成果

- AI機能のプロダクト実装と高速デリバリー

- プラットフォーム/ハーネスのプリミティブを組み合わせ、ユーザー向けのAI機能を短サイクルで実装・リリースする

- プロトタイプ→実験→学習のループを高速に回し、市場からの学びをプロダクトに反映する

- プロンプトエンジニアリングと体験品質の作り込み

- プロンプト設計・検証・改善を通じて、AIの応答品質(正確性・タイムセンス・トーン)をプロダクト水準まで引き上げる

- UIの作り込みとプロンプトの両輪で、モデルの能力をユーザー体験として最大化する

- 実験基盤を活用したデータドリブンな改善

- フィーチャーフラグ・A/B実験・メトリクスを用いて仮説検証を行い、定量データに基づいてイテレーションする

- 実験結果から次の打ち手を定義し、体験の継続的な改善を主導する

- プラットフォーム/ハーネスチームへのフィードバック

- プロダクト実装で得た知見を、必要なプリミティブの要望としてプラットフォーム/ハーネスチームに還元し、基盤の進化をプロダクトドリブンに促す

- 品質基準とAIネイティブな開発プラクティスの実践

- AI生成コードを人間のコードと同等以上の基準で扱い、spec-driven/エージェンティックなワークフローを実務で活用する

## ポジションの魅力

- モデルの能力を「実際のプロダクト体験」に変換する、最もユーザーに近い最前線で、大きな裁量を持ってスピード感高く開発できます。

- 少数精鋭のトップタレント組織の中で、あなたの実装とプロンプト・UIの判断が、ユーザー体験とプロダクトの成否に直接的なインパクトを与えます。

- ラピッドプロトタイピングと実験のループの中で、AIプロダクトの「勝ち筋」を自ら見つけ、形にしていく手応えがあります。

---

# 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

A great AI foundation (platform / harness) creates no value on its own. Value comes from building experiences that make users say "wow" (and building them fast) on top of that foundation. "People don't buy engines, they buy cars," and this role is the one that actually drives the car to the user.

This is an Applied AI Engineer role on the product side, responsible for implementing AI features and shipping them to market. Composing the primitives provided by the platform/harness teams, you will refine user experiences in short cycles through prompt engineering, UI craft, rapid prototyping, and experiment iteration. You will be central to the "prototype, experiment, learn fast" development style practiced by Third Intelligence's engineering teams, raising the real usability of our AI products (information accuracy, time-sense, responsiveness) from a product perspective.

## Responsibilities & Expected Outcomes

- Implement and ship AI features fast: compose platform/harness primitives to build and release user-facing AI features in short cycles; run the prototype → experiment → learn loop quickly and feed market learnings back into the product.

- Craft experience quality via prompt engineering: design, test, and improve prompts to raise AI response quality (accuracy, time-sense, tone) to product standard; maximize model capability as user experience through both UI craft and prompts.

- Data-driven improvement via the experimentation platform: validate hypotheses with feature flags, A/B experiments, and metrics, and iterate on quantitative data; define next moves from experiment results and lead continuous experience improvement.

- Feed back to the platform/harness teams: channel insights from product implementation into requests for needed primitives, driving foundation evolution in a product-driven way.

- Practice quality standards and AI-native development: hold AI-generated code to the same or higher standards as human code and use spec-driven / agentic workflows in practice.

## Tech Stack

- Tools: GitHub / Slack / Notion / Figma

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

- Stack: TypeScript / React / Swift / Kotlin / Python / Go / AWS / Datadog; prompt engineering / LLM API integration / MCP / feature-flag & experimentation infra / rapid prototyping

## What Makes This Position Attractive

- Work at the frontline closest to the user, converting model capability into real product experience, with significant autonomy and speed.

- In an elite organization of top talent, your implementation and your prompt/UI decisions directly impact user experience and the product's success.

- Find and build the "winning path" for an AI product yourself, inside a fast loop of rapid prototyping and experimentation.

Preferred Experiences

- フィーチャーフラグ・A/B実験基盤を用いたデータドリブンなプロダクト改善の経験

- プロンプトエンジニアリングやエージェンティックなワークフローの実践的な深い知見

- モバイル(iOS / Android)またはフロントエンドでのユーザー向けAI機能の実装経験

- 0→1 のプロダクト立ち上げ、またはラピッドプロトタイピングチームでの開発経験

- MCP(Model Context Protocol)やツール統合を用いたAI機能の実装経験

- AIツールや自動化を活用した開発プロセス・生産性の継続的改善

---

- Data-driven product improvement using feature-flag / A/B experimentation platforms

- Deep, practical expertise in prompt engineering and agentic workflows

- Building user-facing AI features on mobile (iOS / Android) or frontend

- 0→1 product launch experience, or work on a rapid-prototyping team

- Implementing AI features using MCP (Model Context Protocol) or tool integration

- Using AI tools and automation to continuously improve the development process and productivity

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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