FDE | Build Enterprise-Scale Generative AI

Software Engineer (FDE/Fullstack Engineer)



About the Company

Our client is a Tokyo-based Applied AI company focused on helping large enterprises solve complex business and sustainability challenges through advanced artificial intelligence technologies.

The organization partners with leading enterprises to design and implement AI-driven solutions that improve operational efficiency, accelerate innovation, reduce risk, and create meaningful business impact. Their work spans cutting-edge areas including Generative AI, large language models (LLMs), knowledge management systems, and environmental applications of AI.

The company brings together researchers, engineers, and business leaders who share a common mission of leveraging AI to address real-world challenges and contribute to a more sustainable and equitable future.

Why Join?

• Work on real-world AI projects with major enterprise clients
• Build production-grade Generative AI and LLM applications
• Collaborate with highly experienced AI researchers and engineers
• Exposure to the latest advancements in machine learning and AI systems
• Opportunity to influence products from concept to deployment
• International and English-friendly working environment
  
  

Company Culture

The organization values individuals who:

• Enjoy solving challenging technical problems
• Take ownership and initiative
• Thrive in collaborative environments
• Want their work to create meaningful impact
• Continuously learn and push beyond their comfort zone

The company emphasizes trust, teamwork, intellectual curiosity, and a high-performance culture built around mutual respect.

Employment & Benefits

• Initial fixed-term employment contract with conversion pathway to permanent employment
• Flexible working hours (core hours apply)
• Hybrid work environment
• Competitive paid leave package
• Full social insurance coverage
• Health checkups and wellness programs
• Learning & development support
• Visa sponsorship support where applicable
• Relocation assistance available for eligible candidates
• Employee referral program
• Equity/stock option opportunities depending on level and role

Location: Tokyo, Japan

Note: Candidates must currently reside in Japan and possess a valid work visa.

Position: Software Engineer (FDE/Fullstack)



Responsibilities

• Design and develop LLM-powered applications and services
• Build prompt-engineering and orchestration pipelines using modern AI frameworks
• Develop Retrieval-Augmented Generation (RAG) systems and vector database integrations
• Build scalable backend services and APIs
• Deploy and manage AI applications on cloud infrastructure
• Benchmark, evaluate, and optimize AI model performance
• Collaborate closely with product, design, and engineering teams
  
  

Requirements



Must Have

• Bachelor's degree or equivalent professional experience
• Experience with at least one programming language such as Python, Go, Java, C++, or Rust
• Experience with cloud platforms (AWS, GCP, or Azure)
• Experience developing and deploying software applications
• Experience building or integrating LLM-based solutions
• Knowledge of relational and NoSQL databases
• Strong analytical and problem-solving skills
• Business-level English communication skills
  
  

Nice to Have

• Experience with LangChain, LlamaIndex, or similar frameworks
• Experience with vector databases and RAG architectures
• Japanese language ability (N3+ preferred)
• Open-source contributions or AI side projects
• Experience evaluating AI model performance and conducting experiments
  

Desired Skills and Experience

Artificial Intelligence, Generative AI, LLM, Large Language Models, Prompt Engineering, RAG, Retrieval-Augmented Generation, LangChain, LlamaIndex, AI Agents, Full Stack Development, Backend Engineering, API Development, Cloud Computing, AWS, GCP, Azure, Vector Databases, Machine Learning, Python, Go, Java, C++, Rust, Enterprise AI, Knowledge Management, Data Pipelines, Fine-Tuning, Software Engineering, Sustainability, Applied AI, System Design, Benchmarking, Performance Optimization, AI Infrastructure, Hybrid Work, Tokyo, English Environment