Senior Test Automation Engineer / SDET (Remote)

Cyclops•Miami, FL

23h•Remote

About The Position

As a Senior Test Automation Engineer, you will build the test infrastructure of a crypto payment platform, covering custody, AML and transaction screening, and stablecoin settlement. This is a horizontal engineering role serving all development squads, covering both the current platform and the new platform being built. Your product is the infrastructure that makes testing cheap for every engineer, including vendor mocks, fast CI feedback, reliable test suites, and easy-to-use test tooling. Success is measured by how cheaply and confidently the engineering team ships.

Requirements

5+ years as a software engineer with substantial test-infrastructure ownership (SDET, platform engineering, or backend engineering with heavy testing responsibility)
Strong TypeScript: our backend services and test automation are TypeScript
Experience building test frameworks and harnesses from scratch, not only writing tests on top of existing ones
Hands-on experience with a modern automation framework, i.e. Playwright
Experience designing test stages in CI/CD pipelines (e.g. GitLab CI), including parallelization and selective test execution
API testing and mocking/stubbing of third-party services
Proficient daily use of AI coding tools, with the ability to review AI-generated code quickly and critically
Prior crypto experience is optional; building a working understanding of crypto and stablecoin payment flows (custody, settlement, screening) on the job is a mandatory part of the role
High agency: this is a horizontal role without daily supervision; you find testing friction yourself, decide what to build, and defend its priority
Strong written and verbal communication in English

Nice To Haves

Fintech, payments, or crypto domain; understanding of testing money flows: idempotency, reconciliation, state machines
Contract testing tooling (e.g. Pact or similar)
Performance and load testing
Experience working in a regulated environment (financial services, healthcare)

Responsibilities

Design and build stateful mocks and simulators of third-party vendor APIs (custody, KYC/KYB, screening providers), serving both the current and the new platform
Implement contract tests that run on schedule against real vendor sandboxes and catch unannounced API changes before they reach production
Build test data and environment tooling: one-command environments with meaningful state
Own the CI test pipeline: fast feedback on every pull request, heavier integration suites nightly and pre-release, parallelization
Eliminate flaky tests: quarantine, statistics, root-cause analysis, so the team trusts a red build
Create test-writing scaffolding (helper libraries, fixtures, object builders) and well-documented test patterns that also serve as templates for AI-assisted test generation
Coach engineers on writing effective tests through reviews and pairing, so that each team owns the quality of its own code
Build production-adjacent checks: post-deploy smoke tests, synthetic transactions, automated verification before traffic is switched to a service