Software Engineer developing and improving developer productivity tools for LangChain's cloud and platform offerings. Working with Infra, Backend, and Frontend to ensure high quality across services.
Responsibilities
Own test strategy end-to-end across APIs, services, UI, data, and infra (K8s/Terraform/Helm)
Stand up ephemeral test environments in Kubernetes for PRs and release candidates; seed test data and run hermetic suites
Shift-left quality in CI/CD (GitHub Actions): parallelization, caching, deterministic seeds, flake tracking, and quality gates
Observability for tests: rich failure artifacts, Datadog dashboards, and actionable alerts
Performance & reliability: baseline SLIs/SLOs for critical paths; capacity tests and regression detection
Partner on incident workflows: reproduce issues, add focused regression tests, and improve runbooks/postmortems
Documentation: high-signal test plans, playbooks, and contributor guidelines for writing good tests
Requirements
3+ years as Infra Engineer/Software Engineer focused on developer productivity
Strong hands-on experience with Python (pytest)
Familiarity with CI/CD (GitHub Actions preferred) and making pipelines fast, parallel, and reliable
Solid understanding of API testing, mocking/stubbing, and data setup/teardown
Comfortable defining quality bars, authoring test plans, and driving cross-team execution
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