Location : Hyderabad/Chennai/Bangalore

Shift : 11-8:30 PM IST

Description - External

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 advantages, 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:

- Develop 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





Required Qualifications:

- Graduate degree or equivalent experience
- PhD or Master’s degree in computer science, Machine Learning, or related field
- Experience in applied AI/ML with statistics, with a Solid track record of delivering production-grade models
- Experience with Hybrid NLP solutions that combine symbolic and machine learning approaches
- Experience with PyTorch
- Deep knowledge and extensive experience with Machine/Deep Learning frameworks including transformer architectures, state space models, large language models, and agentic approaches
- Knowledge of algorithms and techniques within a computational domain with emphasis on text processing
- Proven deep expertise in: NLP, Fundamental machine learning, deep learning, transformer, state space-based architecture
- Azure ML and/or AWS
- Proven solid in Python coding, SQL and database queries, data preparation, and analysis
- Exploratory Data Analysis (EDA)
- LLM training and fine-tuning (e.g., GPT, LLaMA, Mistral, Qwen)
- Graph-based retrieval systems (GraphRAG, knowledge graphs)
- Embedding models (e.g., BGE, E5, SimCSE)
- Semantic search and vector databases (e.g., FAISS, Weaviate, Milvus)
- Document segmentation and preprocessing (OCR, layout parsing)
- Model fusion and ensemble techniques (stacking, boosting, gating)
- Optimization algorithms (Bayesian, Particle Swarm, Genetic Algorithms)
- Reinforcement learning (e.g., RLHF, PPO, DPO, GRPO), Supervised Fine Tuning (SFT), LoRA, QLoRA, axolotl
- Prompt optimization framework (AutoPrompt, GreaterPrompt, DSPy), GEPA

📌 Senior AI/ML Engineer (Hyderabad)
🏢 Optum India
📍 Hyderabad