We are looking for a highly skilled Lead Engineer – AI/ML with strong expertise in Large Language Models (LLMs) and to design, build, and deploy enterprise-scale AI applications. The ideal candidate should have hands-on experience building LLM-powered applications, designing AI agents, orchestrating multi-agent workflows, and developing intelligent automation solutions using modern Generative AI technologies. WHAT YOU'LL DO * Design, develop, and deploy AI applications powered by Large Language Models (LLMs) * Build and optimize Multi-Agent Systems for complex reasoning, planning, and task execution * Develop production-ready applications using Generative AI, Prompt Engineering, and Retrieval-Augmented Generation (RAG) * Fine-tune, evaluate, and optimize LLMs for enterprise use cases * Develop reusable Python libraries and AI frameworks * Build scalable APIs and microservices for AI applications * Integrate AI models with enterprise systems, databases, and external APIs * Collaborate with Product, Engineering, and Data Science teams to deliver innovative AI solutions * Mentor engineers and provide technical leadership on AI initiatives WHAT YOU'LL NEED * Bachelor's degree in Computer Science, Artificial Intelligence, Machine Learning, or a related field * 8+ years of software engineering experience * Proven experience building and deploying LLM-based applications in production * Strong experience with Multi-Agent Systems * Professional experience developing Python libraries for machine learning applications * Strong analytical, problem-solving, and communication skills * Large Language Models (LLMs) * Experience with: Multi-Agent Systems, Prompt Engineering, Retrieval-Augmented Generation (RAG), Vector Databases , REST APIs, Docker, Git, and AWS / Azure / GCP NICE TO HAVE * Master's degree preferred * Strong understanding of LLM architectures and Generative AI * Hands-on experience building intelligent AI agents and multi-agent workflows * Experience designing scalable AI systems for production environments * Ability to lead technical discussions, mentor engineers, and drive AI innovation * Excellent communication and stakeholder management skills * Experience with Typescript, Model Context Protocol (MCP), Fine-tuning LLMs, Semantic Search, MLflow, FastAPI  * Familiarity with CRMs ABOUT US Born in 2001, Code and Theory is a digital-first creative agency that sits at the center of creativity and technology. We pride ourselves on not only solving consumer and business problems, but also helping to establish new capabilities for our clients. With a global client roster of Fortune 100s and start-ups alike, we crave the hardest problems to solve. We have teams distributed across North America, South America, Europe, and Asia. The Code and Theory global network of agencies is growing and includes Kettle, Instrument, Left Field Labs, Create Group, Current, and TrueLogic. Striving never to be pigeonholed, we work across every major category: from tech to CPG, financial services to travel & hospitality, government and education to media and publishing. We value the collaboration with our client partners, including but not limited to Adidas, Amazon, Con Edison, Diageo, EY, J.P. Morgan Chase, Lenovo, Marriott, Mars, Microsoft, Thomson Reuters, and TikTok. The Code and Theory network is comprised of nearly 2,000 people with 50% engineers and 50% creative talent. We’re always on the lookout for smart, driven, and forward-thinking people to join our team.