Lead AI ML Engineer

Build Navanta's retrieval and verification systems with shown queries and citations for every answer. Stand up self-hosted open-weight models serving and embeddings inside bank environments, evolving RAG to a dedicated standard. Design the MCP tool layer exposing audited read-only tools for metrics, documents, and customer 360 views. Maintain the evaluation harness including golden-question regression, groundedness metrics, and explicit "I don't know" behavior as a release gate. Implement LLM guardrails for PII redaction, prompt-injection defense, and cost limits aligned to regulatory security. Partner with data teams to ensure models select governed metrics from the semantic layer. Document architecture and guardrail controls for customer security reviews and audit readiness. Track latency, cost, and quality trade-offs across model versions. Collaborate with data and platform engineering teams while managing an on-call rotation for production reliability.