Lead AI Engineer - LLM, Codex Exp

Job Title: Lead AI Engineer - LLM, Codex ExpLocation: Berkeley Heights, NJ / Alpharetta, GA (5 Days onsite)Employment Type: Fulltime/ Permanent About Smart IT Frame:At Smart IT Frame, we connect top talent with leading organizations across the USA. With over a decade of staffing excellence, we specialize in IT, healthcare, and professional roles, empowering both clients and candidates to grow together.Must Have:Strong software engineering fundamentals and proficiency in Python plus Java Go TypeScript is a strong plusExperience of working with Codex.Proven experience building LLM powered applications in production tool calling function, calling structured outputs retrieval and evaluation.Experience designing distributed systems and APIs REST, RPC plus event driven patterns Kafka, SQS, Pub Sub.Solid understanding of data engineering basics SQL data modeling feature engineering and data qualityHandson knowledge of cloud platforms AWS or Azure or GCP containers, Docker and orchestration Kubernetes preferred.Ability to write clean testable secure code comfortable with code reviews and engineering rigorExperience with multiagent systems planning verification and autonomous workflow executionExperience with vector databases hybrid search and knowledge graphsFamiliarity with model evaluation offline evals golden datasets adversarial testing regression harnesses and AB testing.Mandatory Skills: AI native Software development, AI tools like Claude code or OpenAI Codex, Python AI, Java, Spring boot, LLM, RAG, Agentic AI, ML, Productionization MLOps, LLMOpsGood to Have Skills: AI/Generative AI, GCP Cloud Architecture & Services