▶︎Overview
*position : Software Engineer (AI Agent Product Development)
*salary : ¥6M – ¥13M
*language : Business-level Japanese required
*remote : Full remote within Japan
▶︎About the Company
A rapidly growing AI startup focused on building proprietary Japanese-language LLMs and enterprise AI solutions.
The company develops advanced generative AI technologies from scratch and provides AI-powered products for large enterprise clients across Japan.
Their AI platforms are already adopted by hundreds of major companies, and the organization continues to scale aggressively following large-scale fundraising.
Current business includes:
- AI Agent products for enterprise workflow automation
- AI implementation platforms for enterprise transformation
▶︎About the Role
You will join the early growth phase of AI Agent products and collaborate closely with PMs, designers, and engineers to build next-generation AI-driven enterprise applications.
This role requires engineers who can think beyond specifications, deeply understand customer workflows, and proactively solve both technical and product challenges.
Main responsibilities include:
- Web application prototyping and production development
- Prompt engineering and context engineering for Generative AI
- Building and improving RAG/search systems
- Data platform development
- SaaS operation monitoring and improvements
- Technical blogging and knowledge sharing
▶︎Development environment
- Languages / Frameworks: Ruby on Rails, Python, Vue.js, TypeScript, Flutter, Terraform
- Database / Middleware: Aurora MySQL, OpenSearch, DynamoDB, Redis
- Infrastructure: AWS (ECS, Lambda, Step Functions, Batch, Bedrock, Cognito, SNS, SQS, SES, etc.)
- AI / ML: OpenAI, Azure OpenAI Service, proprietary LLMs, Transformers, vLLM
- Monitoring / DevOps: Terraform, Datadog, Sentry, SendGrid
▶︎Salary
- Annual salary: ¥6,000,000 – ¥13,000,000
- Salary revision twice a year
▶︎Qualifications
Required:
- 4+ years of web application development experience
- Experience developing and operating systems on AWS/GCP/Azure
- Experience contributing to one product/service continuously for over 1 year
- Business-level Japanese communication skills
Preferred:
- Full-stack development experience
- Experience with NLP, Machine Learning, or LLM-based products
- Experience with search systems such as OpenSearch
- Experience collaborating closely with PdMs/designers
- Interest in technical blogging or community activities
▶︎Work environment
- Full remote work available anywhere in Japan
- Flexible work style with flextime system
- Engineering organization of around 20 members
- Opportunity to work on cutting-edge Generative AI products from the early phase
▶︎Allowances and Benefits
- Social insurance
- Transportation support
- Learning budget up to ¥240,000/year
- Defined contribution pension plan
- MacBook Pro provided
- Monthly research day system
- Free drinks at the office
- Regular company events and meetups
- Flexible remote-first culture
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