Principal Engineer - ONESOURCE Income Tax

Thomson Reuters•Frisco, TX

1d•$158,900 - $295,100•Hybrid

About The Position

Thomson Reuters is seeking a Principal Software Engineer for the ONESOURCE Income Tax team. This role involves leading the technical vision for a portfolio of critical tax products, including Income Tax, Estimated Payments, DataQuery and Reporting, Workpapers, and General Ledger Manager Classic. These products are essential for large US corporations' tax filings. The applications are built on .NET, Angular, SQL Server, and PostgreSQL, with DataQuery utilizing Google Cloud Platform (GCP) and a Looker front end. The ONESOURCE platform is hosted on AWS and GCP, and products are accessible via APIs. The team is integrating AI, including MCP servers, and moving towards agentic AI. The Principal Engineer will set long-term technical direction, establish engineering standards, lead secure design practices, assist with SOC audits and security testing, and represent engineering to various stakeholders including Product, Security, the Product Management Office, and senior leadership. This is a strategic, high-impact role intended to serve as a technical role model.

Requirements

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

Nice To Haves

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

Responsibilities

Set the long-term technical vision for the ONESOURCE Income Tax portfolio and design solutions that support long-term business goals and contribute to strategy across the business unit.
Understand current legacy systems in depth, and define architecture patterns, standards, and best practices for future applications.
Design the architecture for AI agents and expand the team's existing MCP server capabilities, identifying opportunities for AI and other technologies to transform business operations.
Lead the team's approach to secure design, ensuring applications pass third-party penetration tests and meet high standards for Snyk vulnerability scanning, and establish patterns and processes for the team to follow.
Guide the design, maintenance, and modernization of applications and infrastructure on AWS and GCP.
Lead complex projects with significant risk that affect a whole sub-business unit, function, or major product, conduct development reviews, and identify and fix weaknesses in existing designs.
Lead the selection, evaluation, and rollout of new technologies and tools, and promote their adoption across teams.
Work closely with Product Owners, ISRM/Security, the Product Management Office, and senior leadership, representing the engineering team and negotiating solutions.
Present complex technical ideas and technology strategy to executives, technical managers, peers, and developers.
Mentor and coach Senior and Lead engineers, help individual contributors understand proposed technical changes, and strengthen the wider engineering culture.
Initiate and participate in work across business units, identifying shared opportunities and recommending improvements to processes, products, or services.
Encourage practical innovation and contribute to standards and patents, developing new concepts, services, and technologies.
Work with project managers to include technical status in project reports and lead or support several projects at once.

Benefits

Flexible hybrid working environment
Flex My Way policies for managing personal and professional responsibilities
Work from anywhere for up to 8 weeks per year
Career Development and Growth opportunities
Grow My Way programming
Skills-first approach to development
Flexible vacation
Two company-wide Mental Health Days off
Access to the Headspace app
Retirement savings
Tuition reimbursement
Employee incentive programs
Resources for mental, physical, and financial wellbeing
Globally recognized, award-winning reputation for inclusion and belonging, flexibility, work-life balance
Two paid volunteer days off annually
Opportunities to get involved with pro-bono consulting projects and Environmental, Social, and Governance (ESG) initiatives
Market competitive health, dental, vision, disability, and life insurance programs
Competitive 401k plan with company match
Competitive vacation, sick and safe paid time off
Paid holidays
Parental leave
Sabbatical leave
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
Access to Employee Stock Purchase Plan