Lead AI or ML Engineer

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.

Primary Responsibilities:

• Lead end-to-end training and fine-tuning of Large Language Models (LLMs), including both open-source (e.g., Qwen, LLaMA, Mistral) and closed-source (e.g., OpenAI, Gemini, Anthropic) ecosystems
• Architect and implement GraphRAG pipelines, including knowledge graph representation and retrieval for enhanced contextual grounding
• Design, train, and optimize semantic and dense vector embeddings for document understanding, search, and retrieval
• Develop semantic retrieval systems with advanced document segmentation and indexing strategies
• Build and scale distributed training environments using NCCL and InfiniBand for multi-GPU and multi-node training
• Apply reinforcement learning techniques (e.g., RLHF, RLAIF) to align model behavior with human preferences and domain-specific goals
• Collaborate with cross-functional teams to translate business needs into AI-driven solutions and deploy them in production environments
• Comply with the terms and conditions of the employment contract, company policies and procedures, and any and all directives (such as, but not limited to, transfer and/or re-assignment to different work locations, change in teams and/or work shifts, policies in regards to flexibility of work benefits and/or work environment, alternative work arrangements, and other decisions that may arise due to the changing business environment). The Company may adopt, vary or rescind these policies and directives in its absolute discretion and without any limitation (implied or otherwise) on its ability to do so

Required Qualifications:

• PhD or master's degree in computer science, Machine Learning, or related field
• 10+ years of experience in applied AI/ML with statistics, with a solid track record of delivering production-grade models
• Deep expertise in: NLP, Fundamental machine learning, deep learning, transformer, state space-based architecture
• Experience with PyTorch
• Experience with Hybrid NLP solutions that combine symbolic and machine learning approaches
• Knowledge of Azure ML and/or AWS
• Knowledge of Exploratory Data Analysis (EDA)
• Knowledge of LLM training and fine-tuning (e.g., GPT, LLaMA, Mistral, Qwen)
• Knowledge of Graph-based retrieval systems (GraphRAG, knowledge graphs)
• Knowledge of Embedding models (e.g., BGE, E5, SimCSE)
• Knowledge of Semantic search and vector databases (e.g., FAISS, Weaviate, Milvus)
• Knowledge of document segmentation and preprocessing (OCR, layout parsing)
• Knowledge of distributed training frameworks (NCCL, Horovod, DeepSpeed)
• Knowledge of high-performance networking (InfiniBand, RDMA)
• Knowledge of model fusion and ensemble techniques (stacking, boosting, gating)
• Knowledge of optimization algorithms (Bayesian, Particle Swarm, Genetic Algorithms)
• Knowledge of symbolic AI and rule-based systems
• Knowledge of Meta-learning and Mixture of Experts architectures
• Knowledge of algorithms and techniques within a computational domain with emphasis on text processing 
• Deep knowledge and extensive experience with Machine/Deep Learning frameworks including transformer architectures, state space models, large language models, and agentic approaches
• Solid in Python coding, SQL and database queries, data preparation and analysis
• Demonstrated publication record in AI domain especially relating to text extraction and summarization

At UnitedHealth Group, our mission is to help people live healthier lives and make the health system work better for everyone. We believe everyone-of every race, gender, sexuality, age, location and income-deserves the opportunity to live their healthiest life. Today, however, there are still far too many barriers to good health which are disproportionately experienced by people of color, historically marginalized groups and those with lower incomes. We are committed to mitigating our impact on the environment and enabling and delivering equitable care that addresses health disparities and improves health outcomes - an enterprise priority reflected in our mission.