As a Principal AI Platform Engineer, you will serve as the primary architect and builder for a transformative initiative aimed at revolutionizing how 500+ engineers deliver value. This is a high-impact role where you will design the scalable infrastructure and SDKs that embed artificial intelligence into every stage of the Software Development Life Cycle (SDLC). Your daily work will involve a sophisticated blend of high-level strategic visioning and hands-on implementation, creating the self-service tooling, RAG architectures, and agentic orchestration frameworks that allow development teams to integrate AI safely and efficiently. You aren't just building tools; you are defining the future of developer experience (DevEx) at an enterprise scale. Joining WTW means becoming part of a global leader that is aggressively investing in AI-augmented engineering. You will work within a culture that balances rigorous governance with rapid innovation, collaborating closely with security, data, and compliance teams to build robust guardrails that don't stifle creativity. This role is positioned at the intersection of platform engineering and cutting-edge AI research, offering a unique vantage point to influence the technical direction of a massive engineering organization. You will act as a mentor and evangelist, hosting office hours and presentations to drive a fundamental shift in how the company approaches software creation. This position offers an exceptional growth trajectory for a senior engineer looking to cement their legacy as an AI transformation leader. By establishing the patterns for model evaluation, prompt engineering, and automated testing, you will be the go-to authority on AI implementation across the firm. Success in this role means significantly reducing onboarding times and accelerating delivery cycles, proving the tangible value of AI in a complex corporate environment. It is a rare opportunity to lead a large-scale technological evolution from the ground up while staying deeply connected to the code.