Senior Fullstack Developer Jobs in Ontario (NOW HIRING)

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

Staff Software Engineer (Full Stack) - Forward Engineering

Join Thomson Reuters' Forward Engineering team and help build the next generation of AIdriven, agentcentric applications that redefine how our internal teams work. This role is ideal for a senior fullstack engineer who thrives in fastpaced environments, adopts AI coding tools to accelerate development, and enjoys partnering closely with AI Engineers and business stakeholders to bring new interaction models to life.

About the Role

As a Staff FullStack Engineer, you will translate complex business challenges into intuitive, efficient applications that integrate seamlessly with evolving AI systems. You'll shape how TR builds software in an era where human users and AI agents collaborate through adaptive, goaldriven interfaces.

What You'll Do

• Develop fullstack applications designed around agentcentric workflows, enabling smooth humanAI collaboration through adaptive UIs and intelligent backend services.

• Create modular, cloudnative APIs that support agent context, state management, and structured tool invocation across distributed AI systems.

• Work closely with AI Engineers to design UI, API, and servicelayer experiences that expose agent capabilities to internal users and developers.

• Use modern frontend and backend tech (React/Next.js, Vue/Nuxt, Angular, Node.js, Python/FastAPI, Java/Spring, .NET) while upholding best practices in API design, state management, CI/CD, testing, performance, and observability.

• Build quick, exploratory prototypes to test new interaction models, learn from user feedback, and influence product direction.

• Lead architectural decisions, mentor engineers, elevate engineering quality, and drive best practices across experimentation and modular design.

• Partner with business units, product teams, AI Engineers, and SMEs to cocreate solutions, shape priorities, and document architectures for broader adoption.

About You - Required Skills & Experience

• 8+ years fullstack engineering experience with ownership of production applications and APIs.
• Deep expertise in at least one modern frontend and backend stack.
• Ability to quickly learn new tools and adapt engineering patterns for AIdriven development.
• Familiarity with AIpowered systems (APIs, data flows, model integration) and eagerness to partner with AI Engineers.
• Experience building systems in cloudnative environments (AWS, Azure, or GCP) and using Docker/Kubernetes.
• Proven leadership in driving technical initiatives and guiding multidisciplinary teams.
• Strong communication, product intuition, and comfort working in fastmoving, exploratory environments.

Preferred Qualifications

• Experience using AI coding tools (Cursor, Cline, Claude Code, GitHub Copilot) to accelerate understanding, design, and implementation across large codebases.
• Ability to leverage AI agents to scale development (parallelizing tasks, accelerating code review, fast iteration from feedback).
• Demonstrated 0to1 prototyping ability with a startuplike mindset.

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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.In the United States, Thomson Reuters offers a comprehensive benefits package to our employees. Our benefit package includes market competitive health, dental, vision, disability, and life insurance programs, as well as a competitive 401k plan with company match. In addition, Thomson Reuters offers market leading work life benefits with competitive vacation, sick and safe paid time off, paid holidays (including two company mental health days off), parental leave, sabbatical leave. These benefits meet or exceeds the requirements of paid time off in accordance with any applicable state or municipal laws. Finally, Thomson Reuters offers the following additional benefits: optional hospital, accident and sickness insurance paid 100% by the employee; optional life and AD&D insurance paid 100% by the employee; Flexible Spending and Health Savings Accounts; fitness reimbursement; access to Employee Assistance Program; Group Legal Identity Theft Protection benefit paid 100% by employee; access to 529 Plan; commuter benefits; Adoption & Surrogacy Assistance; Tuition Reimbursement; and access to Employee Stock Purchase Plan.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. Eligible office location(s) for this role include one or more of the following: New York City, San Francisco, Los Angeles, and/or Irvine, CA; McLean, VA; Washington, DC. The base compensation range for the role in any of those locations is $146,800 USD - $272,600 USD. For any eligible US locations, unless otherwise noted, the base compensation range for this role is $127,400 USD - $236,600 USD. For Ontario, Canada, the base compensation range for this role is $148,800 CAD - $198,800 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.

Thomson Reuters makes reasonable accommodations for applicants with disabilities, including veterans with disabilities, and for sincerely held religious beliefs in accordance with applicable law. If you reside in the United States and require an accommodation in the recruiting process, you may contact our Human Resources Department atHR.Leave-Expert@thomsonreuters.com. Disability accommodations in the recruiting process may include things like a sign language interpreter, making interview rooms accessible, providing assistive technology, or other relevant accommodations. Please note this email is not intended for general recruitment questions and we will promptly respond to inquiries regarding accommodations. More information on requesting an accommodation here.

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