Developer Productivity

LangChain • New York, NY

1d • $175,000 - $240,000 • Onsite

About The Position

We’re hiring a Software Engineer to join the Infrastructure team and own developer productivity across our LangGraph Cloud/Platform and LangSmith products. You’ll work closely with Infrastructure, Backend, and Frontend teams to ship with confidence across Kubernetes-based services, APIs, and UI flows. You’ll also help pioneer quality practices specific to LLM applications, such as prompt regression testing and evaluation suites.

Requirements

• 3+ years of experience as a software engineer or infrastructure engineer
• Strong hands-on experience with Python and testing frameworks such as pytest
• Experience working with CI/CD systems (GitHub Actions preferred) and improving pipeline performance and reliability
• Solid understanding of API testing, mocking/stubbing, and data setup/teardown
• Comfort defining quality standards, writing test plans, and driving cross-team execution

Nice To Haves

• Experience with load and performance testing tools such as k6
• Familiarity with observability tooling such as Datadog or OpenTelemetry
• Experience testing services running on Kubernetes and containerized environments
• Basic infrastructure experience with Helm, Terraform, Kubernetes networking, or secrets management
• SQL fluency for validating data (Postgres, ClickHouse, BigQuery)
• Familiarity with Go, Node, or React for targeted white-box tests and improving system testability

Responsibilities

• Own test strategy end-to-end across APIs, services, UI, data, and infrastructure (Kubernetes, Terraform, Helm)
• Stand up ephemeral test environments in Kubernetes for pull requests and release candidates; seed test data and run hermetic test suites
• Shift quality earlier in CI/CD pipelines (GitHub Actions) through parallelization, caching, deterministic seeds, flake tracking, and quality gates
• Build observability into testing workflows with rich failure artifacts such as logs, traces, and dashboards
• Establish performance and reliability baselines for critical paths, including SLIs, SLOs, and regression detection
• Partner on incident workflows by reproducing issues, adding targeted regression tests, and improving runbooks and postmortems
• Write documentation including test plans, playbooks, and contributor guidelines for writing high-quality tests

Benefits

• medical, dental, and vision coverage
• flexible vacation
• a 401(k) plan
• meals on in-office days in the US

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed