This posting is for proactive recruitment purposes and may be used to fill current openings or future vacancies within our organization.
Lead Software Engineer
- AI (Materia AI)Are you excited about building AI-driven software that redefines how professionals work? Join a dynamic and highly skilled team at Thomson Reuters, where we combine the agility and innovation of a startup with the stability and resources of a global leader. As a Lead Software Engineer, you will play a pivotal role in developing AI-powered systems that enhance accounting workflows through automation, intelligence, and seamless orchestration. The focus is on engineers who can own end-to-end AI systems — from backend services and APIs to LLM-driven workflows in production. -Must have strong hands-on Python backend experience (Fast API/Flask, APIs, distributed systems). -Exposure to Type Script/modern frontend frameworks is helpful, but not required. -Proven experience in system design and architecture, building scalable, production-grade systems. -Strong emphasis on Python, backend engineering, and real-world AI applications. -This is a hybrid role, and the interview process may include onsite interactions.

About The Role
In this role as a Lead Software Engineer, you will:Innovate in a Startup-Like EnvironmentBe part of a fast-moving, forward-thinking group that is creating AI-driven software for accounting professionals. You’ll work with top AI and software development experts, leveraging cutting-edge technology to build intelligent and scalable systems. This role is for the Co Counsel for Tax and Accounting team, formed from the recent acquisition of the startup Materia.
Build AI-Driven SystemsDesign and implement backend services that power generative AI agents and orchestration systems.



This role requires both creativity and rigor to ensure our AI-driven solutions are performant, reliable, and adaptable to real-world use llaborate Across FunctionsWork closely with AI/ML engineers, frontend developers, product managers, and designers to build robust services that support generative AI experiences. Help to build out our core AI interfaces such as Conversations, Workspaces, Grid, and Knowledge Base.

Key Responsibilities
Backend Development & AI Integration
Design and build the backend for AI-native products focused accounting research and accounting workflows such as tax filing, tax advisory, and audit. Develop and maintain backend services using Python, Fast API, and Postgre SQL. Implement AI orchestration systems integrating LLMs from Open AI, Anthropic, and other providers. Design APIs and backend logic for real-time AI interactions. Performance & Scalability
Ensure backend systems are secure, scalable, and optimized for AI-driven applications. Monitor and enhance system performance, across millions of documents and AI driven interactions Collaboration & Leadership
Lead teams of engineers, AI researchers, and product teams to translate AI capabilities into real-world applications, owning large projects or workstreams. Foster a culture of experimentation and continuous improvement, exploring new AI technologies and methodologies.



Assist in hiring and mentorship across the org About You You are a fit for the position of Lead Software Engineer if your background includes:Required Experience & Skills Bachelors Degree in Computer Science, Computer Engineering, Related Field, or Equivalent Experience 6-8 years of experience in backend development, building scalable web services and APIs. Robust Python skills, with experience in Fast API, Postgre SQL, and AWS. Experience in distributed systems, API and data model design. Strong debugging skills and a track record of building production-grade software. Strong communication and cross-functional collaboration abilities. Passion for AI-driven software and new engineering paradigms. A creative problem solver who enjoys exploring new technologies. Dedicated to building high-quality, reliable AI-first systems. Comfortable working in a fast-paced, evolving environment. Preferred Skills & Experience Experience with AI-driven systems, agent-based architectures, or AI APIs from providers like Open AI and Anthropic. Knowledge of vector databases, embeddings, or search-based AI. Strong opinions on backend testing strategies and automation. What’s in it For You? Hybrid Work Model: We’ve adopted a flexible hybrid working environment (2-3 days a week in the office depending on the role) for our office-based roles while delivering a seamless experience that is digitally and physically connected. Flexibility & Work-Life Balance: Flex My Way is a set of supportive workplace policies designed to help manage personal and professional responsibilities, whether caring for family, giving back to the community, or finding time to refresh and reset. This builds upon our flexible work arrangements, including work from anywhere for up to 8 weeks per year, empowering employees to achieve a better work-life balan

📌 Lead software engineer ai (Toronto)
🏢 Thomson Reuters
📍 Toronto