AI Summary
Seeking a Senior Software Engineer to architect and develop mission-critical search, recommendation, and AI agent platforms for a leading AI company. Responsibilities include designing scalable systems, integrating LLMs, improving performance, and mentoring engineers. Requires 5+ years of experience, strong Python, backend scaling, cloud platforms, and business-level Japanese.
Key Highlights
Own architecture and development of AI-powered enterprise SaaS platforms.
Integrate LLM capabilities and build scalable search/recommendation systems.
Mentorship and technical leadership opportunities.
Key Responsibilities
Own the architecture and development of mission-critical search, recommendation, and AI agent platforms.
Design and build highly scalable search and recommendation systems.
Integrate LLM-powered capabilities into enterprise products.
Improve production performance and reliability.
Collaborate closely with Product Managers and cross-functional engineering teams.
Mentor engineers.
Drive technical decisions.
Contribute to broader product development across the platform.
Technical Skills Required
Benefits & Perks
Salary up to ¥18M
Work on cutting-edge AI technologies
Access to advanced AI development tools
Full-flex working hours
Hybrid work environment
Visa sponsorship available
Employee stock ownership program
Strong learning budget
Nice to Have
Experience with LLMs, AI Agents, LangChain, LlamaIndex, RAG, or similar technologies
Machine Learning or NLP experience
Experience mentoring engineers or leading technical projects
MS or PhD in Computer Science or related fields
Business-level English
Experience contributing across multiple product domains
Job Description
The client is one of Japan's fastest-growing AI companies, trusted by over 8,000 enterprises worldwide. Backed by more than $200M in funding from top-tier investors and partnered with OpenAI, they are building next-generation AI products powered by LLMs, intelligent agents, and search technologies.
They are now looking for a Senior Software Engineer to own the architecture and development of mission-critical search, recommendation, and AI agent platforms that power their enterprise SaaS products. In this role, you'll design and build highly scalable search and recommendation systems, integrate LLM-powered capabilities into enterprise products, improve production performance and reliability, and collaborate closely with Product Managers and cross-functional engineering teams to deliver AI-driven user experiences. Beyond implementation, you'll mentor engineers, drive technical decisions, and contribute to broader product development across the platform.
What they're looking for:
- 5+ years of software engineering experience
- Experience building or operating search systems (Elasticsearch, Lucene, Solr, search APIs, indexing pipelines, etc.)
- Strong Python development experience
- Experience building scalable backend systems
- Experience with AWS, Google Cloud, or Azure
- Knowledge of data structures and algorithms
- Business-level Japanese (JLPT N2 or above)
- Passion for leveraging AI-powered development tools and modern engineering practices
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- Experience with LLMs, AI Agents, LangChain, LlamaIndex, RAG, or similar technologies
- Machine Learning or NLP experience
- Experience mentoring engineers or leading technical projects
- MS or PhD in Computer Science or related fields
- Business-level English
- Experience contributing across multiple product domains
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- Salary up to ¥18M
- Work on cutting-edge AI, LLM, Search, and Agent technologies
- Access to the latest AI development tools including ChatGPT Enterprise, Claude Code, Cursor, GitHub Copilot, Devin, and Codex
- Full-flex working hours with a hybrid work environment in Shibuya
- Visa sponsorship available
- Employee stock ownership program
- Strong learning budget for books, certifications, and professional development
- Opportunity to join one of Japan's leading AI engineering organizations shaping the future of enterprise AI products
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