Python (FastAPI) production experience (async, dependency injection, testing). TypeScript/Node integration experience. Built APIs with REST/GraphQL and at least one streaming pattern (SSE/WebSocket). Experience with LLM & RAG: embedding stores (pgvector / OpenSearch / etc), chunking strategies, re-rank, hybrid search; prompt tooling & templates; guardrails. Experience with Observability & quality: structured logging, tracing, metrics; experiment/eval tooling (e.g., Langfuse-style telemetry), offline/online A/Bs. Experience with Data & pipelines: robust CSV/Sheets ingestion, schema validation, PII handling, backfills, scheduled jobs. Agentic experience: familiarity with MCP and agent frameworks, tool design, constrained execution, and safe planning. 4-6+ years software engineering (product environments), ideally with hands-on experience in shipping LLM/GenAI to production. Proven track record owning services end-to-end (design, implementation, rollout, monitoring, and iteration). Clear writing, pragmatic decision-making, and comfort collaborating with Mobile, Backend, and Ops (Dev/LLM).