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.

Location: In person 5 days/week in San Francisco, CA or New York, NY

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

Example projects you might own

A pull-request ephemeral end-to-end testing harness that deploys a minimal LangSmith stack in CI and runs Playwright and API suites against seeded tenants

A k6 performance scenario that simulates multi-tenant traffic and surfaces p95/p99 latency regressions per release

Developer Productivity

Responsibilities

Qualification

Preferred

Benefits

Company

Langchain

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