Senior Backend Engineer (JAPAN AI - AI Agent Framework)

About JAPAN AI

JAPAN AI, Inc. was established in April 2023 as a group company of Geniee, Inc., a publicly listed company, with the aim of dramatically enhancing the potential of working people through AI technology. We leverage cutting-edge AI technology to drive research and development both domestically and internationally.

We focus particularly on the development of AI agents, offering innovative products and solutions utilizing large language models (LLM). This enables us to improve productivity and operational efficiency across various industries.

JAPAN AI takes advantage of the flexibility and rapid decision-making of a startup to quickly adopt the latest technologies, providing optimal solutions to clients. Our diverse team with an international perspective enhances our competitiveness in the global market.

We aim to create new value and contribute to the progress of society as a whole through the transformative power of AI. Let's lead innovation through AI and create a future where technology enables people to achieve more.

Related URLs

• Our Website
• Company Introduction Materials
• Tech Blog

Why We’re Hiring

As we anticipate rapid business expansion, we are seeking a Senior Engineer who can lead research, development, and product implementation in advanced technical domains.

In particular, to accelerate research and large-scale development in the AI Agent domain, we urgently need to strengthen our team with engineers who can contribute to the development of core backend frameworks.

Position

Senior Backend Engineer (AI Agent Framework Team)
Role : Tech Lead or Member

You will be responsible for enhancing and optimizing the AI Agent Framework, which is utilized across our organization.

This position involves leading the implementation of complex features, such as a high-speed, scalable, multi-tenant runtime environment and interactions between multiple agents, while collaborating with internal and external development teams.

Job Description

As a Senior Backend Engineer, you will:

• Design and develop the AI Agent Framework:
  • Lead the development of core components, primarily in Python, to create a robust and scalable framework.
• Build architectures for agent collaboration:
  • Develop systems that enable seamless interaction and cooperation between AI agents, ensuring extensibility and adaptability.
• Implement and operate scalable runtime environments:
  • Create multi-tenant runtime environments optimized for real-time inference and performance in cloud-native settings.
• Collaborate with research teams:
  • Work closely with researchers to translate cutting-edge advancements in LLMs and AI Agents into practical product features.
• Lead the team:
  • Drive technical decision-making, improve development processes, and mentor other engineers to foster their growth.
• Optimize performance:
  • Continuously enhance system performance, ensuring reliability and efficiency in large-scale deployments.

This role offers the opportunity to work on groundbreaking technologies that push the boundaries of AI and software engineering.

Team Structure

Approximately 65 members are part of the development organization. Development is divided into the following groups:

• Client Solution Development
• In-house AI SaaS Development
• Common Infrastructure Development (Infra / Data / AI R&D)

Required Qualifications

We are looking for candidates with:

• Bachelor's or Master's degree in Computer Science, Software Engineering, Artificial Intelligence, Machine Learning, Mathematics, Physics, or related fields
• Practical experience in application development using Python (5+ years)
• Practical experience in machine learning (3+ years)
  • Machine Learning Algorithms : Basic understanding and implementation experience in regression, classification, clustering, etc.
  • Data Preprocessing : Skills in data cleaning, transformation, and feature engineering
  • Model Evaluation : Understanding and application of evaluation metrics such as accuracy, recall, and F1 score
• Practical experience in natural language processing (3+ years)
  • Text Processing Techniques : Experience using natural language processing libraries (NLTK, spaCy, Transformers, etc.)
  • Language Models : Experience in fine-tuning pre-trained models such as BERT, GPT, RoBERTa
• Experience with cloud platforms (AWS, GCP, or Azure) and container technologies (Docker, Kubernetes).
• Business-level communication skills in either English or Japanese (proficiency in one is required).

Preferred Qualifications

Candidates with the following experience or skills will be highly regarded:

• Development or research experience in AI/ML, chatbots, Generative AI, NLP, or agent frameworks.
• Expertise in distributed systems or performance optimization in large-scale data environments.
• Knowledge of multi-agent system design and implementation, including frameworks for agent collaboration.
• Experience in team leadership or management, or a strong desire to take on technical leadership roles.
• Practical experience working in multinational environments or overseas.

Tech Stack

Languages: Python (for framework development), TypeScript / React / Next.js (for frontend development)
Infrastructure: GCP (containers / Kubernetes), Docker
Tools: Slack, Confluence, Linear, Google Workspace, GitHub
Work Environment: Mac (Apple Silicon), dual monitors available

Learning and Development Support

• AI Tool Usage Support:
  • Company covers the cost of using AI tools such as JAPAN AI SaaS services, Curosor, CharGPT, Claude, etc.
• Development Tool Support:
  • If a desired development tool is paid, the cost is covered (up to 30,000 yen per year)
• Book Purchase Assistance:
  • Company covers the cost of purchasing books for learning, such as technical books (up to 30,000 yen per half-year)
• Language Learning / Qualification Support:
  • Company covers the cost of Japanese or English learning programs and qualification acquisition
• Refresh Allowance:
  • Company covers the cost of services used for personal refreshment (up to 5,000 yen per month)
  • e.g., gym, yoga, chiropractic, aquarium, movies, theme park tickets, etc.
• Housing Allowance:
  • Housing allowance provided for those living in designated areas (up to 30,000 yen per month)

Work Style

Hybrid Work: 3 days in office, 2 days remote
Flexible working hours: Core time is negotiable
Flexibility: Future consideration for more flexible work styles is possible

Why You’ll Love This Role

• Opportunity to engage with cutting-edge technology:
  • Gain practical experience in the rapidly growing field of large language models and AI agents, significantly enhancing technical skills.
• Discretion and speed:
  • Benefit from the rapid decision-making process unique to startups, enjoying flexibility in the adoption of new technologies, creating an environment where individual ideas can be quickly realized.
• Diverse and multicultural team:
  • Work with an internationally diverse engineering team, deepening cross-cultural understanding and fostering a global perspective. Positions not requiring Japanese language skills are also available.
• Impactful work:
  • Play a crucial role in shaping the future of AI-driven products, directly contributing to the success of clients and industries, experiencing the impact on society.
• Professional growth:
  • Contribute to technical strategy, demonstrate leadership, and grow with a highly skilled team, preparing for the next step in your career.

Selection Process

CV Screening → Coding test → Multiple Interviews → Final Interview
(Reference checks are required before the final interview.)

Additional Information

This position will initially be hired by Geniee, Inc. and then seconded to JAPAN AI, Inc. (both companies share the same location and workplace).
There is a possibility of transferring to JAPAN AI, Inc. in the future.