About The Role
We are a: 15-person health-tech B2B platform running a serverless-first AWS stack (Lambda, API Gateway, RDS, Amplify, Cognito). We’re looking for a QA Engineer / SDET who writes test code, owns test infrastructure, and is fluent in using AI tooling to author and maintain tests — as well as testing AI-powered features themselves.
You’ll be the person who turns "we keep shipping regressions" into a durable, automated safety net. This is a hands‑on, code‑writing role. You’ll work directly with a small engineering team and own QA strategy end‑to‑end.

What you’ll do

Design and maintain end‑to‑end and regression test suites in Playwright (our current framework), including using `codegen` and AI‑assisted authoring to accelerate coverage.
Use AI tooling (LLM‑based test generation, self‑healing selectors, AI code assistants) to reduce the cost of writing and maintaining tests — with judgment about where AI helps and where it introduces flakiness.

Test LLM‑and MCP‑powered product features: build evaluation harnesses, define quality bars for non‑deterministic outputs, and design guardrail/regression checks for natural‑language and agent‑driven workflows.

Attack our three standing testing gaps: mock drift, untested Lambda infrastructure, and recurring regressions that ship without accompanying tests.





Build post‑deploy smoke tests and contract tests against our integration layer (Hub Spot, Dwolla, Intercom, Post Hog, Slack).

Partner with engineering to enforce a Definition of Done that requires tests, and embed QA into the sprint cadence rather than bolting it on at the end.

Must-have

Strong Java Script/Type Script; you write and maintain test code, not just test plans.
Production experience with Playwright, Cypress, or equivalent modern E2E frameworks.
Hands‑on experience using AI tools in a real testing workflow (test generation, maintenance, or triage).
Experience testing non‑deterministic / AI‑powered systems, or a clear, credible approach to how you’d do it.
Comfort in AWS serverless environments (Lambda, API Gateway) and testing distributed integrations.

Ability to own strategy independently in a small team.

Nice-to-have

Experience with LLM evaluation frameworks or building eval/guardrail systems.
MCP or agent‑based tooling familiarity.
Prior QA‑in‑a‑startup experience where you built the function from scratch.

Health‑tech, fintech, or regulated‑industry background.

Why this role

You’ll own QA at a company that treats testing as an engineering problem, not a checkbox — with real autonomy, a modern stack, and a mandate to bring AI into the workflow deliberately.

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📌 QA Automation Engineer (Argentina) (Buenos Aires)
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