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Principal AI Engineer | London | Excellent Salary +Benefits Join an award-winning, internationally recognised International B2B Consultancy organisation as a Principal AI Engineer, where you will play a pivotal role in shaping and delivering production grade generative AI capabilities. This is a senior; hands-on engineering role focused on building the intelligence layer of advanced AI products. You will design and implement Retrieval-Augmented Generation (RAG) pipelines, agentic workflows, and robust evaluation frameworks that ensure AI systems are accurate and aligned with real-world business needs. Reporting to the Director of AI, you will translate strategy and architecture into high-quality implementations, working closely with AI Platform Engineering to ensure solutions are scalable, maintainable, and production ready. Design, build, and train production-grade generative AI systems.Implement robust RAG pipelines that effectively leverage proprietary and domain-specific content.Develop agentic and workflow-based AI patterns with a focus on determinism, quality, and maintainability.Apply model adaptation techniques prompting, fine-tuning, distillation-to optimise quality, latency, and cost.Establish strong experimentation and evaluation practices to measure correctness, faithfulness, and robustness.Act as a technical authority, providing hands-on leadership, mentoring, and code-level guidance to AI engineers.Collaborate closely with platform, product, and delivery teams to move AI capabilities from experimentation into production.Contribute to advanced retrieval techniques, including Graph-RAG and structured knowledge representation, where they add value. Required Skills & Experience Strong Python proficiency for production-grade AI development, with hands-on experience using LlamaI