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 Servicethe system that makes a customers own documents usable by CoCounsel Legals 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 customers content together with Thomson Reuters world-class proprietary content and the latest frontier models including TRs 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 somethingyoureproud 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 domainWhere 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 CoCounsels 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 customers 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 someones 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 boundariesSome stages of this pipeline are owned by other teams. Partner with the storageextraction indexing connectors and front-end teamsto ensure we all ship something great.

• FullyintegrateArchitecture and DevOpsYou 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:

• Bachelors or mastersdegree 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 isYou 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 guaranteesAt-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 ownershipYou 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.