Lead Software Engineer AI in Toronto

This posting is for proactive recruitment purposes and may be used to fill current openings or future vacancies within our organization.

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 (FastAPI/Flask, APIs, distributed systems).
• Exposure to TypeScript/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.

In this role as a Lead Software Engineer, you will:

• Innovate in a Startup-Like Environment: Be 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.
• Build AI-Driven Systems: Design 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 cases.
• Collaborate Across Functions: Work closely with AI/ML engineers, frontend developers, product managers, and designers to build robust services that support generative AI experiences.

Key Responsibilities

• Backend Development & AI Integration: Design and build the backend for AI-native products focused on accounting research and accounting workflows such as tax filing, tax advisory, and audit. Develop and maintain backend services using Python, FastAPI, and PostgreSQL. Implement AI orchestration systems integrating LLMs from OpenAI, 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 organization.

About You

You are a fit for the position of Lead Software Engineer if your background includes:

• 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.
• Strong Python skills, with experience in FastAPI, PostgreSQL, 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 OpenAI 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.
• Career Development and Growth: By fostering a culture of continuous learning and skill development, we prepare our talent to tackle tomorrow’s challenges and deliver real-world solutions.
• Industry Competitive Benefits: We offer comprehensive benefit plans to include flexible vacation, two company-wide Mental Health Days off, access to the Headspace app, retirement savings, tuition reimbursement, employee incentive programs, and resources for mental, physical, and financial wellbeing.
• Culture: Globally recognized, award-winning reputation for inclusion and belonging, flexibility, work-life balance, and more.
• Social Impact: Make an impact in your community with our Social Impact Institute. We offer employees two paid volunteer days off annually and opportunities to get involved with pro-bono consulting projects and Environmental, Social, and Governance (ESG) initiatives.

We are one of the few companies globally that helps its customers pursue justice, truth, and transparency. Together, with the professionals and institutions we serve, we help uphold the rule of law, turn the wheels of commerce, catch bad actors, report the facts, and provide trusted, unbiased information to people all over the world.