Staff Software Engineer – AI Platform

About this role

Thomson Reuters is building the AI platform that will power the next decade of tax, accounting and audit products, including [CoCounsel Audit](http://tax.thomsonreuters.com/en/products/cocounsel-audit?searchid=TRPPCTAX/Microsoft/TRBrandUS_CoCounsel_Search_Brand_US/CoCounselAudit&chl=ppc&cid=6681439&sfdccampaignid=701PA00000X0QM5YAN&ef_id=:G:s&s_kwcid=AL!7944!3!!e!!o!!cocounsel%20for%20audit&msclkid=3978188d776a192c972671747bfce3aa), a suite of AI‑native products used by accountants on real client work every day. As a Lead Software Engineer (Staff 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](https://www.trymateria.ai/).

About the role:

You will be a Lead Software Engineer (Staff Engineer) responsible for the backend and orchestration layer powering AI agents, conversations, workspaces, and knowledge base across CoCounsel for Audit.

• Shape the team'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 your product area and adjacent teams, not just a single feature.
• Shape the platform integration strategy across new and existing Thomson Reuters audit systems to provide world-class content and solutions for our customers.
• 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 accountants doing time‑sensitive work.
• Small team, big surface area: Join a tight group of senior engineers and researchers shipping quickly, with direct access to product leadership and customers. Think ownership of a startup with the runway of a public company.
• Great fit for people who enjoy and thrive at setti...