Senior Software Engineer II

Job description

Senior Software Engineer - Customer Files Orchestration

CoCounsel Legal is seeking a Senior Software Engineer to help build andoperatetheCustomer Files Orchestration Service -the system that makes a customer's own documents usable by CoCounsel Legal's agents.

Every file a customer brings to CoCounsel passes through this team:upload, storage, extraction, embedding, and indexing, orchestrated end-to-end. You make millions of customer files available to CoCounsel. Bringing a customer's content together with Thomson Reuters' world-class proprietary content and the latest frontier models - including TR's own custom large language models - is what makes our products highly differentiated and our agent experiences genuinely grounded. This team is a critical part of what makes that combination possible.

It is also, unavoidably, a hard distributed systems problem. Supporting millions of files means real engineering: dedicated workers, fair queuing so one busy customer cannot starve another, durable state, idempotent processing, and honest reasoning about consistency and delivery guarantees across systems this team does not own.

The team owns what it builds, designing, implementing, testing, deploying, scaling, andoperatingthe service end-to-end.As a Senior SoftwareEngineeryou own a meaningfulpartof that service outright. Youare eager to ship somethingyou’reproud ofand become someone the team trusts.

Key responsibilities:

Design & Technical Ownership

• Own theorchestration service end-to-end - Take an ambiguous problem, shape it into a design, write the ADR, build it, ship it, and operate it. Youand the teamare accountable for the outcome, not just the pull request.

• Make and defend the calls that define this domain -Where eventual consistency is safe and where only a strongly-consistent read is correct; at-least-once with idempotent processing versus the real cost of exactly-once; lease and heartbeat models for crash recovery; compare-and-swap state transitions across asynchronous service boundaries.

• Build the queuing and flow-control machinery - Fair queuing so one busy tenant cannot starve another, rate limiting, backpressure, circuit breaking, dead-letter handling, and autoscaling.

• Treat our APIs as a product - CoCounsel's file and workspace APIs serve a growing set of consumers beyond orchestration. Versioned contracts, documented behavior, backward compatibility, and deliberate change management are part of the work, not paperwork after it.

• Design for correctness at scale, not correctness in a test - Anticipate the failure modes that only appear underconcurrency andload andbuild systemswhere whole classes of bugscannot occur rather than fixing them one at a time.

Reliability & Operations

• Operate what you build - Take a primary on-call rotation for the service, lead incident response, and drive thepost-mortemthat keeps the same failure from recurring.

• Make the system explain itself - Instrument and trace well enough to tell "we never notified downstream" apart from "we notified downstream too early", and to answer a customer's "where did my file go?" in minutes rather than days.

• Reduce operational toil deliberately - Automate the recurring manualfix andtreat a runbook step that exists only in someone's head as a defect.

Technical Leadership & Collaboration

• Raise the bar around you - Mentor engineers through code review and design review. Bring positive energy to the team.

• Work well across boundaries -Some stages of this pipeline are owned by other teams. Partner with the storage,extraction, indexing, connectors, and front-end teamsto ensure we all ship something great.

• FullyintegrateArchitecture and DevOps -You are part of a teamwhereengineers do thesystem design.There are no DevOpsengineersbecauseeveryoneis responsible fordeveloping andoperating.

• Communicate trade-offs plainly - Make the cost of correctness, the meaning of a throughput number, and the risk in a deadline legible to product partners and to your own team.

Required Qualifications:

• Bachelor's or master'sdegree - Computer Science, Engineering, or a related field, or equivalent practical experience.

• 5+ years building production software - With a track record of owning significant components in systems that real customers depend on.

• Extensive AWS and production Python experience - This is a Python service on AWS, and you should be able to move confidently through both the code and the infrastructure.

• Concurrency in Python, and a healthy respect for how treacherous it is -You understand the GIL and what it does and does not protect you from, you have written and debugged productionasynciocode, and you have been bitten by the classics: fire-and-forget tasks that swallow their own failures, blocking work smuggled onto the event loop, semaphores and pools that quietly cap throughput far below the worker count, and background tasks racing the state they are meant to be updating.

• Kubernetes in production - Our workers and APIs run as pods with event-driven autoscaling (KEDA). You have tuned scalers and resource requests, and you have debugged the real failure modes.

• Large-scale orchestration or data pipeline experience - Systems that move large volumes of work through multiple stages across service boundaries, where retries, partial failure, and long-running steps are the normal case rather than the exception.

• Consistency models - You can explain whereeventual consistency is safe and where it silently corrupts a user-visible outcome, and you have debugged the difference in production.

• Delivery guarantees -At-least-once versus exactly-once, why idempotency is usually the real answer, and what it costs to get it wrong.

• Queues, fair queuing, rate limiting, and backpressure - Practical, hands-on understanding, including multi-tenant fairness and noisy-neighbor isolation.

• API design instincts - Versioned contracts, clear ownership, backward compatibility, and treating an internal API as something other teams build on.

• Real operational ownership -You have carried the pager for something you built, debugged it under pressure, and come out with a fix rather than a workaround.

• Strong engineering fundamentals - Testing, code review, observability, CI/CD, and infrastructure-as-code as habits rather than obligations.

• Clear communication - You can write a design down, defend it, change your mind when the evidence says so, and explain the result to someone who does not share your context.

Preferred Qualifications:

• Documents and document management systems - Extraction, OCR, format handling, very large files, and the integration surface of third-party DMS platforms.

• Event-driven architectures and streaming - Kafka/MSK or similar, managed queueing such as SQS, and event-driven autoscaling.

• Durable workflow engines - Temporal, Step Functions, or similar, with a clear view of when they are worth adopting.

• Retrieval, embedding, or indexing pipelines - Supporting LLM or agentic applications.

• Prior exposure to the legal industry - A real bonus, and a meaningful head start on understanding what our customers actually need from their documents.

• Team topologies - This organization uses its vocabulary natively (stream-aligned teams, platform teams, and the boundaries between them) to reason about how services and teams are shaped.

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.

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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