5+ years of backend API development experience, ideally using Python/Django, Node.js/NestJS, or Golang/Gin Built APIs for at least 3 enterprise apps involving complex third-party integrations in fast-paced environments Strong understanding of agile methodologies Proficient in system design and SQL data modeling for high-traffic applications (10k+ daily users) Hands-on experience implementing production-ready LLM features, including semantic search, vector databases, RAG, and prompt engineering