This posting is for proactive recruitment purposes and may be used to fill current openings or future vacancies within our organization. Thomson Reuters is building the AI platform that will power the next decade of tax, accounting and audit products, including CoCounsel Audit, 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. This role is for the CoCounsel for Audit team, formed from the recent acquisition of the startup Materia.

About The Role

• Own the AI backbone: principal engineer responsible for the backend and orchestration layer powering AI agents, conversations, workspaces, and 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, ...