Bellevue, WA Long Term Contract What You Will Do: Primary Focus: Scalable API and service development, data storage, performance optimization, and integration with LLM services. Designing, testing, and optimizing prompts and prompt flows for LLMs and RAG systems. Must Have: Strong experience in one or more server languages (Java/.NET), REST/GraphQL, relational + caching (Postgres/Redis), and message queues. Practical experience with major LLMs (OpenAI, Anthropic, LLaMA family), prompt templ