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. This role is for the CoCounsel for Tax and Accounting team, formed from the recent acquisition of the startup Materia.
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. Help to build out our core AI interfaces such as Conversations, Workspaces, Grid, and Knowledge Base.
Backend Development & AI Integration
Design and build the backend for AI-native products focused 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 org
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.
Bonus Points
Bachelor's degree in Computer Science or related field
Comfortable contributing to front-end development with React, Next.js, and TypeScript
Experience working in a startup or similar fast-paced setting
Experience building AI-native products, chatbot interfaces, or API-driven platforms
Familiarity with large language models (LLMs), AI agent design, and/or prompt engineering
Experience with cloud infrastructure, event-driven architectures, or observability tooling
Opinionated about testing methodologies, A/B testing, and safe rollouts
#LI-FZ1
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.
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.
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More information about Thomson Reuters can be found on thomsonreuters.com
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Ciudad de México, Ciudad de México, México
Hybrid