Senior Backend Engineer/Team Lead - AI Agent Framework (#8728)

¥8,000,000 ～ ¥16,000,000

Apply
Tokyo
Full time
Media Publishing
IT

About the company

Our client is a leading ad tech firm that boosts customer revenue through advanced advertising technology.

Job description

About the Opportunity

 
Our client is an innovation-driven organization at the forefront of AI integration, with a strong focus on enhancing productivity and transforming operational efficiency through advanced technology. As part of their mission, they have launched a dedicated entity to accelerate research and development in cutting-edge domains, including large-scale language models (LLMs) and AI agents.
This team is focused on building transformative AI solutions and offering consulting, product development, and implementation support for businesses ready to embrace AI in practical and scalable ways.
To support their rapid growth and ambitious roadmap, our client is seeking a Senior Backend Engineer to join the AI Agent Framework Team. This role is critical in driving the design and development of robust backend infrastructure that powers intelligent, autonomous systems.
Your Responsibilities

 
As a Senior Backend Engineer, you will play a leading role in the architecture and development of their AI Agent Framework, with key responsibilities including:
  • Framework Development:
    Design and build core components of the AI Agent Framework in Python to support scalability, flexibility, and performance.
  • Agent Collaboration Architecture:
    Develop systems that enable seamless interaction and cooperation between multiple AI agents in real-time environments.
  • Scalable Runtime Environments:
    Implement cloud-native, multi-tenant runtime environments optimized for real-time inference and high availability.
  • Research Collaboration:
    Work closely with research teams to integrate the latest advancements in LLMs and AI Agent technologies into deployable product features.
  • Technical Leadership:
    Drive architectural decisions, improve development processes, and mentor fellow engineers to grow a high-performing team.
  • Performance Optimization:
    Continuously enhance system performance to support large-scale and high-demand deployments.
Tech Stack
 
  • Languages: Python (backend), TypeScript / React / Next.js (frontend)
  • Infrastructure: GCP, Kubernetes, Docker
  • Tools: Slack, Confluence, Jira, Google Workspace, GitHub
  • Hardware: Mac (Apple Silicon), dual monitors
  • AI Tools: In-house GPT utilities, GitHub Copilot
Team & Culture
 
  • Join a talented engineering group of approximately 30 professionals
  • Work in a collaborative environment that emphasizes autonomy, innovation, and technical excellence
  • Multinational team with opportunities to work in English—Japanese proficiency not required for all roles
Why You’ll Love This Role
 
  • Work with Frontier Technologies:
    Be part of a team tackling challenges in AI agents, LLMs, and scalable systems, with real-world applications.
  • Startup Agility, Tech Depth:
    Enjoy high levels of freedom, fast decision-making cycles, and the ability to shape technical direction.
  • Global Collaboration:
    Contribute to projects alongside international peers in a culture that values diverse perspectives.
  • Meaningful Impact:
    Build systems that directly influence the future of AI-powered business operations and workflows.
  • Career Growth:
    Take ownership of key technical initiatives and grow into a leadership role within a supportive, high-performing team.
 

Requirements

Minimum Qualifications
  • Bachelor’s or Master’s degree in Computer Science or related discipline, or equivalent practical experience
  • 5+ years of backend development experience using Python, Java, or similar
  • Strong fundamentals in algorithms, data structures, and software engineering
  • Practical experience with cloud infrastructure (GCP, AWS, or Azure) and containerization (Docker, Kubernetes)
  • A deep interest in LLMs, AI Agents, and staying at the edge of innovation
  • Business-level communication in either English or Japanese
Preferred Qualifications
  • Experience in AI/ML, NLP, chatbots, Generative AI, or agent-based frameworks
  • Expertise in distributed systems and performance optimization
  • Knowledge of multi-agent system architecture and implementation
  • Experience in leading teams or stepping into technical leadership roles
  • Prior work experience in a multinational or international environment

Benefits

  • ​​​​​​OVERTIME WORK (​時間外労働): Yes
  • SOCIAL INSURANCE (加入保険): 健康保険、厚生年金、雇用保険、労災保険
  • HOLIDAYS (休日): 土、日、祝日

Language requirement

English (Business advanced)

Working hours

10:00-19:00

Probation period

3 months
Back to jobs