About the role Thomson Reuters is building the AI platform that will power the next decade of tax, accounting and audit products, including CoCounsel Audit. As a Principal Software Engineer for the CoCounsel for Audit team (formed from the acquisition of Materia), you will own core backend and AI orchestration systems that turn frontier models into reliable, production‑grade workflows at scale.

Responsibilities Own the AI backbone: principal engineer responsible for the backend and orchestration layer powering AI agents, conversations, workspaces, and the knowledge base across CoCounsel for Audit.

Shape the company’s AI platform and patterns: define patterns for building MCP servers, designing agents, novel uses of LLMs, experimentation, and scalable infrastructure.

Work at real production scale: build and evolve systems that operate over millions of documents, highly structured tax data, ever changing laws, and thousands of concurrent AI interactions from ac...