Platform DX Engineer for Testing & Reliability

LangChain, Inc.; New York, Northern (NY, KY); Hybrid; USD 175,000 - 240,000; Full time

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,