Senior ML Engineer

BrightHire•New York City, NY

62d•Remote

About The Position

You will partner closely with our Engineers, Product, and Design to productionize early-stage AI features into high quality, performant AI features that delight users at scale. Your focus will be on quality and safety testing: devising rigorous evaluation frameworks, refining prompts and pipelines, and optimizing model choices for cost, latency, accuracy, tone, and safety. You will help build the shared AI platform that powers products such as: AI Interviewer conversation loops that adapt in real time AI Fraud Signals that flag suspicious behavior with minimal false positives AI Candidate skills matrices and assistants that surface instant insights

Requirements

5+ years in Data Science or ML engineering with a strong focus on ML or NLP systems.
1+ year focused on Gen-AI or LLM systems.
Strong Python and SQL skills.
Experience creating automated evaluation suites for LLM outputs (accuracy, safety, bias, tone, style) and using results to guide iterative improvements.
Knowledge of prompt engineering, RAG techniques, vector search, embeddings, fine-tuning, and model selection across multiple providers.
Ability to communicate complex AI trade-offs clearly to engineers, designers, and executives alike
Bias toward action, curiosity, and a passion for building high-quality user experiences

Responsibilities

Design and own comprehensive evaluations that measure accuracy, completeness, style, hallucination rate, bias, and safety across every release.
Tune and iterate on RAG pipelines, prompt chains, conversation loops, provider selections, and fine-tunes until quality bars are met or exceeded.
Build reusable data and evaluation pipelines, a shared semantic layer, and monitoring dashboards that make it easy for product teams to ship reliable AI quickly.
Optimize for cost and latency, continuously benchmarking models and negotiating trade-offs between performance and spend.
Implement robust data governance and lineage practices that satisfy enterprise compliance requirements and support our AI bias audit process.
Document best practices and share knowledge to raise the bar for AI development across BrightHire.