[Remote] Senior AI ML Engineer - Remote

Note: The job is a remote job and is open to candidates in USA. Optum is a global leader in health care innovation, developing solutions that improve health outcomes. The Senior AI/ML Engineer will design and build enterprise-scale generative AI applications and workflows, collaborating with cross-functional teams to enhance health and financial technology solutions.ResponsibilitiesDesign, develop, and deploy enterprise-scale AI-powered solutions and LLM-powered applications using modern GenAI frameworks and APIs with an emphasis on the responsible use of AIDevelop agentic AI workflows, multi-step reasoning systems (with tool usage and memory), and advanced Retrieval-Augmented Generation (RAG) pipelinesDesign and develop responsive frontend applications using React and Nextjs, and build backend services, APIs, and microservices using Python and NodejsBuild systems for document ingestion, chunking, embeddings, semantic search, and advanced retrieval strategies (hybrid search, GraphRAG, contextual enrichment)Design and optimize relational data models using PostgreSQL and integrate vector databases with relational data sources for contextual responsesDefine end-to-end architecture spanning frontend, backend, AI, and data layers, ensuring performance, scalability, and reliabilityLead technical decision-making, design reviews, and code reviews, while mentoring junior engineers in AI engineering and full-stack best practicesUse enterprise-approved AI tools to streamline developer workflows, automate tasks, and drive continuous improvement across the development lifecycleEvaluate emerging AI trends, frameworks, tools, and technologies to inform solution design, strategic innovation, and technical directionCollaborate with product, business, and engineering teams to translate complex business requirements into scalable technical designs, communicating complex AI concepts to non-technical stakeholdersSkillsBachelor's degree or equivalent experience (such as an additional 4+ years of software development experience in lieu of a degree)6+ years of professional experience in software engineering or AI/ML engineering4+ years of hands-on experience with frontend technologies (React, Nextjs) and backend development (Python or Nodejs, and REST APIs)3+ years of experience with relational database design and optimization using PostgreSQL2+ years of experience building and deploying end-to-end Generative AI and LLM-powered applications in production2+ years of experience designing and implementing RAG (Retrieval-Augmented Generation) pipelines, including semantic search, embeddings, and vector databases1+ years of experience with AI orchestration frameworks (such as LangChain, LangGraph, or CrewAI) or developing agentic, multi-agent AI workflowsBachelor's or Master's degree in Computer Science, Artificial Intelligence, Data Science, or a related technical fieldExperience implementing hybrid search strategies, GraphRAG, and contextual enrichment patterns for document retrievalDeep understanding of distributed systems, microservices architecture, and enterprise application scalabilitySolid expertise in designing AI evaluation metrics and establishing safety guardrails for reliable model outputsProven ability to mentor engineering teams, lead technical design reviews, and establish best practices in full-stack and AI developmentProven excellent cross-functional communication skills, with the ability to translate complex technical AI concepts into clear business insights for stakeholdersBenefitsA comprehensive benefits packageIncentive and recognition programsEquity stock purchase401k contribution (all benefits are subject to eligibility requirements)All employees working remotely will be required to adhere to UnitedHealth Group's Telecommuter PolicyCompany OverviewOptum provides primary care and optical care services. It was founded in 1985, and is headquartered in Albuquerque, New Mexico, USA, with a workforce of 10001+ employees. Its website is https://nm.optum.com.Company H1B SponsorshipOptum has a track record of offering H1B sponsorships, with 73 in 2026, 648 in 2025, 559 in 2024, 620 in 2023, 851 in 2022, 593 in 2021, 438 in 2020. Please note that this does not guarantee sponsorship for this specific role.