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Backend Engineer (AI-driven SaaS)

Full-time

Snaphunt

About the Role

  • Develop backend systems for an AI-powered SaaS product
  • Work with large-scale enterprise data and implement LLM-based features
  • Work on a proven product with real users and real impact

Responsibilities

  • Backend development using Python (FastAPI) and TypeScript
  • Design and implement LLM-based features
  • Improve APIs, data models, and overall system performance

Tech Stack

Languages

  • Python (FastAPI), TypeScript (Next.js), SQL

Databases / Search

  • PostgreSQL
  • Elasticsearch / OpenSearch

Infrastructure

  • AWS, GCP, Fastly

Internal Tools

  • GitHub, Slack, Notion, Asana, Google Workspace
  • Cursor / Claude Code (AI-assisted coding, refactoring)
  • CodeRabbit (AI-based PR review)
  • n8n (AI workflow orchestration)

Requirements

  • Experience in backend development
  • Experience designing APIs and databases
  • Experience working in an agile development environment
  • Currently residing in Japan, or willing and able to relocate to Japan
  • Business-level Japanese communication skills (equivalent to JLPT N1)

Nice to Have

  • Experience with AI / LLM-related development
  • Experience in architecture or system design
  • Experience working at a startup

Employment & Benefits

  • Employment type : Full-time
  • Salary : JPY 4,000,000 – 9,000,000 (depending on experience and skills)
  • Fully remote work within Japan
  • Full flex-time system (no core hours)
  • Stock options available

Why Join Us?

  • Work on real-world AI products used by real businesses
  • Build systems handling large-scale data and LLM-based intelligence
  • Join a startup that already has PMF and is entering a major growth phase
  • Shape both the product and engineering culture from an early stage

To apply for this position, please visit our official careers page and submit your application via the link below:

Vacancy posted more than 2 months ago
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