Software Engineer (Platform)

Job title: Software Engineer (Platform)

Sakana AIでは、自然界から発想を得るユニークな生成AI技術により世界を先駆ける研究開発を行っています。Platform Teamでは、これらの最先端の研究をエンタープライズソリューションとして提供していくための土台となるエージェント実行基盤、評価基盤、ナレッジベースなどのモジュールを開発し、ソリューション開発を効率化することをミッションとしています。このミッションを共に推進するSoftware Engineerを募集しています。

Platformの「ユーザー」は、Platformを利用してソリューションを開発する社内外の開発者、またはAIエージェント自体です。優れた基盤は、堅牢なバックエンドだけでなく、それを使う開発者やエージェントが直感的に扱えるインターフェース（API、SDK、管理画面、ダッシュボード等）があって初めて価値を発揮します。そのため、自らをインフラの作り手としてだけでなく「プロダクトの作り手」と捉え、ユーザーの体験を起点に基盤を設計できる方を求めています。

この職務は、日本を拠点とし、日本語でのビジネスレベルの会話および業務文書を理解する能力が求められます。

At Sakana AI, we are conducting world-leading research and development with unique generative AI technologies inspired by nature. The mission of the Platform Team is to develop modules such as agent execution infrastructure, evaluation infrastructure, and knowledge bases that serve as the foundation for providing this cutting-edge research as enterprise solutions, thereby streamlining solution development. We are looking for a Software Engineer to promote this mission together.

The "users" of the Platform are internal and external developers or AI agents that use the Platform to develop solutions. Excellent infrastructure only demonstrates its value when it has not only a robust backend but also interfaces (APIs, SDKs, management screens, dashboards, etc.) that developers and AI agents can use intuitively. Therefore, we are looking for someone who can view themselves not just as a builder of infrastructure but as a "product maker," and design the platform starting from the user experience.

This position is based in Japan and requires the ability to understand business-level conversation and operational documents in Japanese.

Roles and Responsibilities

• Design, development, and operation of reusable Platform modules (agent execution infrastructure, evaluation infrastructure, knowledge base, etc.) commonly used across multiple solutions.

• Collaborate with Solution / Product teams to integrate Platform components into each solution to improve development efficiency and quality.

• Construction and operation of the infrastructure supporting production, including CI/CD, monitoring, scaling, and security.

• Provide SDKs, templates, documentation, and agent skills for developers using the Platform and provide developer support. Collect feedback through collaboration and proactive hearing to reflect it in platform improvements.

• Collaboration in a global team using both Japanese and English.

• Qualifications and Skills

• 3+ years of experience as a software engineer in the areas of Platform, Infrastructure, or SRE.

• Backend development experience with any of Python, TypeScript, or Java.

• Experience designing and operating production systems using container orchestration such as Kubernetes.

• Experience building systems on public clouds (AWS / GCP / Azure).

• Practical experience in development and operation using CI/CD and IaC (Terraform, etc.).

• Experience developing applications or infrastructure using LLM APIs (OpenAI / Anthropic / Google, etc.).

• Product mindset focused on designing and developing from the user experience.

• Strong motivation for improving development productivity and process automation.

• Ability to communicate effectively in both English and Japanese for business, with the flexibility to adapt language use depending on the situation

• Japanese: JLPT N2 equivalent or higher, or equivalent practical experience

• English: Eiken Grade 2 equivalent or higher, or equivalent practical experience

• Preferred Qualifications

• Frontend development experience using React, Next.js, TypeScript, etc.

• Experience with AI agent frameworks (LangGraph, Mastra, OpenAI Agents SDK, etc.) or MCP.

• Experience designing and building observability infrastructure using Datadog, Prometheus, OpenTelemetry, etc.

• Experience operating LLMOps (prompt management, evaluation pipelines, tracing infrastructure: Langfuse, MLflow, etc.).

• Experience designing LLM evaluations (evaluation datasets, LLM-as-judge validity verification, metric design).

• Experience developing applications and infrastructure utilizing LLMs and AI agents (Function calling, MCP, multi-agent systems, etc.).

• Experience in providing and promoting internal platforms and developer tools (Platform Engineering / DevOps).

• Experience in an AI/ML startup.

• Experience with data governance and compliance in large-scale organizations.

• Proven track record of OSS contributions or technical advocacy.

• Bachelor's or Master's degree in Computer Science or a related field.

• Business-level conversation skills in English.

• Employment Type

• Full-time / Contract (24+ hours per week)

Benefits

• Social insurance

• Fully paid annual leave, holidays, year-end and New Year holidays

• Various leave types including condolence, maternity/paternity, and caregiving

• Flexible work hours / discretionary labor system (depending on role)

• Hybrid work arrangement (office + remote)

• Commuting allowance

• Defense policy note

• Sakana AI is based in Japan and conducts business with the Japanese government. Please understand and align with our policy on defense business before applying.

• Japanese: https://sakana.ai/company-info/defense-policy.html?lang=ja

• English: https://sakana.ai/company-info/defense-policy.html?lang=en