Principal Engineer - ONESOURCE Income Tax

Job Description

Are you an engineering leader who likes solving hard technical problems and also understands the business behind them? Thomson Reuters is looking for a Principal Software Engineer to join the ONESOURCE Income Tax team. Our portfolio includes Income Tax, Estimated Payments, DataQuery and Reporting, Workpapers, and General Ledger Manager Classic. These are tier-one products that large US corporations rely on to file their taxes, and our customers have high expectations.

Our applications are built on .NET, Angular, SQL Server, and PostgreSQL. DataQuery, our data warehousing solution, runs on Google Cloud Platform (GCP) with a Looker front end. Our products are delivered through the ONESOURCE platform, hosted on AWS and GCP, and customers also use them through our APIs. We have started building with AI, including our own MCP servers, and we are moving toward agentic AI.

In this role, you will set the long-term technical vision for our current platforms and the applications we build next. You will set engineering standards, lead secure design practices, and help the team through SOC audits and third-party security testing. You will also represent engineering to Product, Security, the Product Management Office, and senior leadership. This is a strategic, high-impact role. You will be seen as a technical role model, both inside the organization and in the wider industry.

Key Responsibilities

• Technical vision and strategy: Set the long-term technical vision for the ONESOURCE Income Tax portfolio. Design solutions that support long-term business goals and contribute to strategy across the business unit.
• Architecture and standards: Understand our current legacy systems in depth. Define the architecture patterns, standards, and best practices for future applications.
• Agentic AI: Help design the architecture for AI agents and expand the team's existing MCP server capabilities. Find places where AI and other technologies can change how the business works.
• Security and compliance: Lead the team's approach to secure design so applications pass third-party penetration tests and meet our high standards for Snyk vulnerability scanning. Set up patterns and processes for the team to follow instead of fixing issues yourself. Help the team through SOC audits and related controls.
• Cloud and infrastructure: Guide the design, maintenance, and modernization of applications and infrastructure on AWS and GCP.
• Complex, high-risk initiatives: Lead complex projects with significant risk that affect a whole sub-business unit, function, or major product. Run development reviews and spot and fix weaknesses in existing designs.
• Technology selection: Lead the selection, evaluation, and rollout of new technologies and tools, and promote their adoption across teams.
• Stakeholder partnership: Work closely with Product Owners, ISRM/Security, the Product Management Office, and senior leadership. Represent the engineering team and negotiate solutions between key people.
• Communication: Present complex technical ideas and technology strategy to executives, technical managers, peers, and developers.
• Mentorship and culture: Mentor and coach Senior and Lead engineers. Help individual contributors understand proposed technical changes and strengthen the wider engineering culture.
• Cross-functional collaboration: Start and take part in work across business units. Look for shared opportunities and recommend improvements to processes, products, or services.
• Innovation: Encourage practical innovation and contribute to standards and patents. Develop new concepts, services, and technologies that meet current and future customer needs.
• Project partnership: Work with project managers to include technical status in project reports. Lead or support several projects at once.

Required Qualifications

• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent experience
• 10+ years of software engineering experience, including significant time in senior, lead, or principal-level technical leadership roles
• Strong experience with the Microsoft stack (.NET / C#), Angular, Microsoft SQL Server, and PostgreSQL
• Hands-on experience with AWS and GCP, covering both applications and infrastructure
• A proven record of designing and evolving large, high-availability enterprise applications, including modernizing legacy systems
• Strong grounding in secure software design and application security, including Snyk (or similar tools), penetration testing and fixing what it finds, and secure coding standards
• Familiarity with SOC audits and the engineering controls and evidence that compliance requires
• Experience leading through influence: setting technical direction, defining patterns and standards, and guiding teams without managing them directly
• Excellent communication and presentation skills, with experience working with Product, Security, program management, and senior leadership
• Business sense and the ability to connect technical decisions to customer and business results

Preferred Qualifications

• A background as a software or solutions architect
• Experience in the tax, accounting, finance, or a related regulated domain
• Experience with agentic AI, LLM-based solutions, and Model Context Protocol (MCP) servers
• Experience with GCP data warehousing solutions and Looker
• Experience with Infrastructure as Code (for example, Terraform or CloudFormation) and CI/CD practices
• Experience designing and governing APIs used by external customers
• Relevant cloud or security certifications (for example, AWS or GCP Professional Architect, or security certifications)
• An external presence, such as conference talks, publications, patents, open-source contributions, or work on industry standards
• Experience mentoring Senior and Lead engineers and building engineering culture across several teams

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What's in it For You?

• Hybrid Work Model: We've adopted a flexible hybrid working environment 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.

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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