Platform DX Engineer for Testing & Reliability

LangChain, Inc.

New York, Northern (NY, KY)

Hybrid

USD 175,000 - 240,000

Full time

14 days+
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Benefits offered by this job

Medical insurance
401(k) plan
Meals on in-office days

Job summary

LangChain, Inc. is seeking a Software Engineer to join the Infrastructure team, owning developer productivity across LangGraph Cloud/Platform and LangSmith products.

You will collaborate with Infrastructure, Backend, and Frontend teams to ship confidently across Kubernetes-based services, APIs, and UI flows, while pioneering quality practices for LLM applications. The role emphasizes hands-on testing, observability, and improving CI/CD processes, with in-person work 5 days/week in San Francisco,

Qualifications

  • 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.

Responsibilities

  • Own test strategy end-to-end across APIs, services, UI, data, and infrastructure (Kubernetes, Terraform, Helm).
  • Stand up ephem erous test environments in Kubernetes for PRs 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 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.

Skills

Python
pytest
CI/CD
API testing
Data setup/teardown

Tools

GitHub Actions

Job description

LangChain, Inc. is seeking a Software Engineer to join the Infrastructure team, owning developer productivity across LangGraph Cloud/Platform and LangSmith products.

You will collaborate with Infrastructure, Backend, and Frontend teams to ship confidently across Kubernetes-based services, APIs, and UI flows, while pioneering quality practices for LLM applications. The role emphasizes hands-on testing, observability, and improving CI/CD processes, with in-person work 5 days/week in San Francisco,

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