Senior AI​/ML Engineer - Remote

Optum is a global organization that delivers care, aided by technology to help millions of people live healthier lives. The work you do with our team will directly improve health outcomes by connecting people with the care, pharmacy benefits, data and resources they need to feel their best. Here, you will find a culture guided by inclusion, talented peers, comprehensive benefits and career development opportunities.

Come make an impact on the communities we serve as you help us advance health optimization on a global scale.

Join us to start Caring. Connecting. Growing together. Optum is a global organization delivering care, powered by data and technology, to help millions of people live healthier lives.

, we are not just witnessing the AI transformation in healthcare-we are leading it. Our mission is clear: to simplify healthcare with AI, turning insight into action at a scale few organizations in the world can match.

As part of the Optum.ai team, you'll work at the intersection of cutting-edge artificial intelligence and real-world healthcare impact. From reducing administrative burden for providers to anticipating patient needs and improving access to quality care, your work will help solve some of healthcare's most complex challenges-and directly improve health outcomes for millions of people.

You'll collaborate with world-class talent across data science, engineering, product, and healthcare domains, backed by the reach and stability of Optum and United Health Group. Here, responsible innovation matters. So do comprehensive benefits, meaningful career growth, and the opportunity to make a tangible difference-advancing health equity and creating a simpler, more connected healthcare experience for everyone.

This is more than a job. It's a chance to shape the future of healthcare through the transformative power of AI.

Optum AI is United Health Group's enterprise AI team. We are AI/ML scientists and engineers with deep expertise in AI/ML engineering for healthcare. We develop AI/ML solutions for the highest impact opportunities across United Health Group businesses including United Healthcare, Optum Financial, Optum Health, Optum Insight, and Optum Rx. In addition to transforming the healthcare journey through responsible AI/ML innovation, our charter also includes developing and supporting an enterprise AI/ML development platform.

• Design and deploy generative AI and NLP solutions using transformer-based architectures for enterprise use cases such as search, summarization, extraction, conversational AI, and decision support
• Develop and fine-tune large language model (LLM) applications using commercial and open-source models such as OpenAI, Anthropic/Claude, Gemini, LLaMA, or Mistral
• Design and implement retrieval augmented generation (RAG) pipelines including document ingestion, chunking strategies, embedding generation, and vector database integration
• Build agentic AI systems including single agent and multi agent workflows capable of tool use, reasoning, planning, and autonomous task execution
• Implement evaluation and monitoring frameworks for generative AI systems including hallucination detection, bias monitoring, and human in the loop evaluation
• Develop safety and governance controls for AI systems including prompt hardening, policy enforcement, and responsible AI guardrails
• Productionize AI/ML pipelines using CI/CD, testing, monitoring, and observability best practices in cloud native environments
• Collaborate with product, platform, and data science teams to translate requirements into scalable AI solutions

You will be rewarded and recognized for your performance in an environment that will challenge you and give you clear direction on what it takes to succeed in your role as well as provide development for other roles you may be interested in.

• 5+ years of experience in machine learning, AI engineering, or applied data science including development of production ML systems
• 5+ years of experience developing Python-based ML systems using frameworks such as PyTorch, Tensor Flow, or Hugging Face
• 3+ years of experience building Generative AI or LLM applications including prompt engineering, model fine tuning, and LLM API integrations
• 2+ years of experience designing retrieval augmented generation (RAG) systems and vector search pipelines
• 1+ years of experience building agentic AI systems including tool calling, planning frameworks, or multi agent workflows
• 1+ years of experience using…