Tax Software Developer Jobs in Toronto, ON (NOW HIRING)

Senior Software Engineer - AI (Materia AI)

We're building the next generation of AIpowered platforms for tax and accounting professionals, and we're looking for a Senior Software Engineer who can architect highperformance backend systems that bring realworld AI capabilities to life. If you thrive in fastmoving environments, enjoy tackling complex distributedsystems challenges, and want your work to directly enable intelligent, productiongrade features, this role is for you.

About the Role

As a Senior Software Engineer - AI, you will design, implement, and optimize backend services that fuel AInative experiences across our Materiadriven product ecosystem. You'll be responsible for shaping the architecture, scalability, and reliability of systems that coordinate LLM interactions, serve hightraffic APIs, and manage largescale content processing.

• Design and build backend services using Python, FastAPI, and PostgreSQL to support realtime AI interactions and largescale data flows.
• Shape the architectural foundation of our AI platform by defining service boundaries, system interfaces, and scalable design patterns.
• Develop highperformance APIs and microservices that power AI agents, orchestration engines, and content pipelines, ensuring smooth operation under heavy load.
• Integrate backend systems with modern LLM providers (e.g., OpenAI, Anthropic) and implement reliable orchestration, routing, and execution safeguards.
• Productionize AI capabilities with robust error handling, guardrails, telemetry, and deep observability for performance and reliability.
• Lead core engineering decisions-driving architecture reviews, mentoring teammates, and promoting best practices in testing, resiliency, and maintainability.
• Strengthen CI/CD pipelines and DevOps automation to support fast, stable, cloudnative development workflows.
• Collaborate closely with ML engineers, product managers, and designers to turn early AI concepts into scalable backend solutions.
• Deliver backend systems that transform ambitious AI ideas into productionready experiences used by thousands of professionals.

About You

Required Qualifications

• Minimum 7+ years building backend systems, APIs, and microservices.
• Strong proficiency in Python, FastAPI, PostgreSQL, and AWS cloud services.
• Deep understanding of distributed systems, architecture, and data modeling.
• Experience with AIdriven systems or agentbased architectures.
• Proven ability to deliver productionready, highly reliable systems.
• Excellent debugging skills and strong crossfunctional communication.
• Comfortable operating in fastpaced, iterative environments.

Preferred Skills

• Curiosity and enthusiasm for integrating AI technologies into real applications.
• Familiarity with embeddings, vector search, or RAG retrieval patterns.
• Strong opinions on testing, automation, and operational robustness.
• Experience with modern LLM APIs or orchestration frameworks.

#LI-SB1

#LI-SB1

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

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 balance.

• 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. Our Grow My Way programming and skills-first approach ensures you have the tools and knowledge to grow, lead, and thrive in an AI-enabled future.

• 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. We live by our values: Obsess over our Customers, Compete to Win, Challenge (Y)our Thinking, Act Fast / Learn Fast, and Stronger Together.

• 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.

• Making a Real-World Impact: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.

Our use of AI within the recruitment process Thomson Reuters utilizes Artificial Intelligence (AI) to support parts of our global recruitment process. Unless you opt-out, our AI system will assess the information provided by you and compare it to the requirements listed for the role, and present the result to our recruitment personnel for further review. The AI system acts as a supporting tool, but there is always a human making the decision if you will be considered for the role

Thomson Reuters complies with local laws that require upfront disclosure of the expected pay range for a position. The base compensation range varies across locations. For Ontario, Canada, the base compensation range for this role is $100,000 CAD - $145,000 CAD. Base pay is positioned within the range based on several factors including an individual's knowledge, skills and experience with consideration given to internal equity. Base pay is one part of a comprehensive Total Reward program which also includes flexible and supportive benefits and other wellbeing programs. This role may also be eligible for an Annual Bonus based on a combination of enterprise and individual performance.

About Us

Thomson Reuters informs the way forward by bringing together the trusted content and technology that people and organizations need to make the right decisions. We serve professionals across legal, tax, accounting, compliance, government, and media. Our products combine highly specialized software and insights to empower professionals with the data, intelligence, and solutions needed to make informed decisions, and to help institutions in their pursuit of justice, truth, and transparency. Reuters, part of Thomson Reuters, is a world leading provider of trusted journalism and news.

We are powered by the talents of 26,000 employees across more than 70 countries, where everyone has a chance to contribute and grow professionally in flexible work environments. At a time when objectivity, accuracy, fairness, and transparency are under attack, we consider it our duty to pursue them. Sound exciting? Join us and help shape the industries that move society forward.

As a global business, we rely on the unique backgrounds, perspectives, and experiences of all employees to deliver on our business goals. To ensure we can do that, we seek talented, qualified employees in all our operations around the world regardless of race, color, sex/gender, including pregnancy, gender identity and expression, national origin, religion, sexual orientation, disability, age, marital status, citizen status, veteran status, or any other protected classification under applicable law. Thomson Reuters is proud to be an Equal Employment Opportunity Employer providing a drug-free workplace.

We also make reasonable accommodations for qualified individuals with disabilities and for sincerely held religious beliefs in accordance with applicable law. More information on requesting an accommodation here.

Learn more on how to protect yourself from fraudulent job postings here.

More information about Thomson Reuters can be found on thomsonreuters.com