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Principal Software Engineer CoCounsel

CoCounselis our most advanced AI offering to date combining generative and agentic AI capabilities to help legal professionals move beyond prompting and start delegating. As a Principal Software Engineer you will set the technical direction for the backend AI orchestration and identity systems that turn frontier models into reliable secure production-grade workflows that attorneys in-house legal departments and government agencies trust on real client matters every day.

This role sits at the heart of theCoCounselLegal engineering organization partnering closely with AI/ML engineers researchers product and our identity and platform teams to deliver world-class legal content and AI experiences at scale.

About the role:

In this opportunity as a Principal Software Engineer you will:

Participate in shapingthe companys AI platform and patterns:Define patterns for building MCP servers designing agents novel uses of LLMs experimentation and scalable infrastructure. Your decisions will influence multiple product lines not just a single feature.

Work at real production scale: Build and evolve systems that operate over millions of documents complex and ever-changing law privileged client data and thousands of concurrent AI interactions from professionals doing time-sensitive work. Considering implications tocloud costs optimizations etc.

Small team big surface area:Join a tight group of senior engineers and researchers shipping quickly with direct access to product leadership and customers. Think ownership of a startup with the runway of a public company.

Technical leadership and cross-functional influence:Leadand/or designinitiatives that cut across AI product identity and staff and senior engineers raising the bar onAI integration practicessystem design code qualityandsecurity across the the expert in new model capabilities collaborating closely with AI/ML engineers researchers designers and PMs to translate industry improvements into reliable user-facing workflows that legal professionals shape the teams roadmap technical strategy and engineering culture from experimentation practices to testing rollout and define and lead the platform integration strategy across new and existing Thomson Reuters legal systems to deliver world-class content and solutions for our customers.

Identity access and trust:Define how autonomous agents act on a users behalf safely: scoped delegation least-privilege service identities secrets management and consistent enforcement of entitlements across documents matters and content with security platform and compliance teams on multi-tenancy isolation data residency privilege protection and the audit trails that legal and government customers the design and evolution of authentication and authorization acrossCoCounselLegal SSO/federation (SAML OIDC OAuth 2.0) token and session management and fine-grained role- and attribute-based access control (RBAC/ABAC).

Scale reliability and performance:Design for high-throughput low-latency AI workloads: caching queuing rate-limiting model failover and cost/performance with large-scale data: millions of documents retrieval and search vector stores and indexing strategies tailored to legal use and refine SLOs observability and incident response for AI systems that must be correct auditable and trustworthy in professional legal workflows.

About You:

You are a fit for the position of Principal Software Engineer if your background includes:

Bachelors Degree in Computer Science Computer Engineering a related field or equivalent experience.

Demonstrated experience building with AI LLMs agents and retrieval and a strong point of view on what AI-native software should look like.

Proven track record owning large complex projects end-to-end: architecture execution rollout and long-term operation.

Deep Python expertise and experience with production systems using frameworks likeFastAPI(or similar) relational databases (PostgreSQL or equivalent) and a major cloud provider (AWS preferred).

Strong background in distributed systems: data modeling API contracts observability resilience patterns and performance tuning under load.

Hands-on experience with identity and access management designing or integrating authentication and authorization at scale (SSO SAML OIDC OAuth 2.0 RBAC/ABAC token/session management or comparable IAM systems).

Excellent communication skills and the ability to partner with product design security and ML teams in a fast-moving environment.

Preferred Skills & Experience:

Hands-on experience designing and operating agentic systems in production tool calling MCP servers multi-step workflows and orchestration around third-party and in-house LLMs (e.g. Anthropic OpenAI) including prompt/response management cost controls and safety considerations.

Experience with AI-adjacent infrastructure: vector databases embeddings semantic search or custom retrieval pipelines.

Opinions and experience around automated testing reliability and release practices for systems with non-deterministic model behavior.

#LI-IG1

Whats in it For You

Hybrid Work Model: Weve 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 tomorrows 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.

DISCLAIMER

The above information in this description has been designed to indicate the general nature and level of work performed by employees within this classification. It is not designed to contain or be interpreted as a comprehensive inventory of all duties responsibilities and qualifications required of employees assigned to this job.

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 26000 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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Required Experience:

Staff IC

Employment Type : Full-Time

Experience: years

Vacancy: 1