For Recruiters

Josh Zirena: Tech Lead, Production AI

Tech lead specializing in taking AI features from prototype to production: RAG, LLM guardrails, observability, backend APIs, and AWS. Below is the short version, plus a downloadable résumé.

Download résumé (PDF)LinkedInjoshzirena@gmail.com

Recent AI / backend experience

NestMind: database-grounded chat tracking

My own project: a chat-first tracker where Claude Sonnet drives via tool use but Postgres holds the data, so it can't hallucinate counts or lose entries. FastAPI, tool use, observability, AWS.

Government health AI assistant

Grounded RAG assistant answering strictly from approved public-health content, with streaming, citations, auth, and a feedback-capture loop.

AI evaluation pipeline

Scheduled multi-model evaluation with Langfuse tracing and digest summaries to catch prompt and model regressions before users did.

Core skills

AI / LLM

RAG architecturePrompt engineeringLLM guardrailsEvaluation pipelinesAnthropic / OpenAI APIsVector search (pgvector)

Backend

PythonFastAPIREST APIsPostgreSQLAsync / streaming

Cloud & Ops

AWSDockerTerraform / IaCObservability (Langfuse)CI/CD

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