Principal Software Engineer-AI

Principal Software Engineer-AI

Thomson Reuters is building the AI platform that will power the next decade of tax and accounting products, including CoCounsel for Tax and Accounting – a suite of AI‑native products used by accountants on real client work every day. As a Principal Software Engineer, you will own core backend and AI orchestration systems that turn frontier models into reliable, production‑grade workflows at scale.

Why this role is different:

• Own the AI backbone: You will be the principal engineer responsible for the backend and orchestration layer powering AI agents, conversations, workspaces, and knowledge base across CoCounsel for Tax and Accounting.
• Shape the company's AI platform and patterns: Define patterns for building MCP servers, designing agents, novel uses of LLMs, experimentation, and scalable infrastructure. Your decisions will influence multiple product lines, not just a single feature.
• Work at real p...