Sr. AI / ML Engineer – OpenAI Expert

We are looking for a highly skilled Sr. AI / ML Engineer with deep OpenAI expertise to lead the design, development, and deployment of enterprise-grade AI solutions for Zensar's global client portfolio. This is a senior individual contributor role requiring hands-on mastery of

OpenAI's full platform stack

• including GPT-4o, o-series reasoning models, Assistants API, Function Calling, and Fine-Tuning — combined with strong ML engineering fundamentals. The ideal candidate will architect scalable agentic AI systems, RAG pipelines, and multi-model workflows that deliver measurable business impact across Zensar's Data Engineering & Analytics service line.
• Lead end-to-end design and delivery of OpenAI-powered solutions: agentic RAG systems, enterprise chatbots, and AI-driven automation workflows.
• Architect and implement multi-agent pipelines using OpenAI Agents SDK, LangGraph, and LangChain, with robust tool-use and memory management.
• Leverage the full OpenAI API surface — GPT-4o, o1/o3-mini, Assistants API, Batch API, Structured Outputs, and Vision — for diverse client use cases.
• Design and execute fine-tuning strategies for OpenAI models on domain-specific datasets; evaluate using the OpenAI Evals framework.
• Build high-performance semantic search and retrieval layers using OpenAI Embeddings integrated with vector databases (Pinecone, pgvector, Azure AI Search).
• Develop scalable ML pipelines using Python, PyTorch, and scikit-learn to complement and extend OpenAI model capabilities.
• Drive prompt engineering excellence — system prompt design, chain-of-thought reasoning, few-shot learning, and token optimization strategies.
• Mentor junior engineers and establish AI engineering best practices, coding standards, and reusable accelerators within Zensar's ZenseAI.Data platform.
• Collaborate with Zensar's delivery managers and client stakeholders to translate business requirements into robust AI architectures.
• Monitor model performance, cost efficiency, and safety in production; implement guardrails aligned with OpenAI's usage policies.
• 8–12 years of overall experience in AI / ML engineering, with at least 3 years of hands-on OpenAI platform expertise.
• Expert-level proficiency with OpenAI APIs: Chat Completions, Assistants API, Function Calling, Structured Outputs, Embeddings, and Fine-Tuning.
• Deep experience building production-grade agentic RAG systems, conversational AI, and multi-agent orchestration pipelines.
• Strong Python engineering skills; experience with async programming, API design, and scalable backend systems.
• Hands-on experience with LLM orchestration frameworks: LangChain, LangGraph, LlamaIndex, and OpenAI Agents SDK.
• Proficiency in ML frameworks — PyTorch, TensorFlow, scikit-learn — for model development complementary to LLM workflows.
• Experience with OpenAI Evals and systematic approaches to model benchmarking, red-teaming, and quality assurance.
• Solid understanding of NLP fundamentals: tokenization, embeddings, semantic similarity, named entity recognition, and summarization.
• Strong system design skills: ability to architect distributed, fault-tolerant AI systems for enterprise scale.
• Excellent communication skills; capable of presenting AI solutions and trade-offs to both technical and executive audiences.
• Hands-on experience with Azure OpenAI Service, including managed deployments, content filtering, and private networking.
• Familiarity with open-source LLMs (LLaMA 3, Mistral, Phi-3) and ability to benchmark against GPT-4o for cost-performance trade-offs.
• Experience with MLOps tooling — MLflow, Weights & Biases, CI/CD for ML — and best practices for production AI observability.
• Knowledge of responsible AI principles: bias detection, explainability, hallucination mitigation, and content safety frameworks.
• Prior exposure to Zensar's ZenseAI.Data platform, Snowflake, dbt, or Informatica IICS in a data engineering context.
• Contributions to open-source AI projects or published technical writing on OpenAI / LLM topics.
• Bachelor's or Master's degree in Computer Science, AI, Machine Learning, or equivalent practical experience.