Senior Test Automation Engineer / SDET (Remote)

Senior Test Automation EngineerAs a Senior Test Automation Engineer, you will build the test infrastructure of a crypto payment platform: custody, AML and transaction screening, stablecoin settlement. This is a horizontal engineering role serving all development squads, covering both our current platform and the new platform we are building. Your product is the infrastructure that makes testing cheap for every engineer: 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.Key ResponsibilitiesDesign and build stateful mocks and simulators of third-party vendor APIs (custody, KYC/KYB, screening providers), serving both the current and the new platformImplement contract tests that run on schedule against real vendor sandboxes and catch unannounced API changes before they reach productionBuild test data and environment tooling: one-command environments with meaningful stateOwn the CI test pipeline: fast feedback on every pull request, heavier integration suites nightly and pre-release, parallelizationEliminate flaky tests: quarantine, statistics, root-cause analysis, so the team trusts a red buildCreate test-writing scaffolding (helper libraries, fixtures, object builders) and well-documented test patterns that also serve as templates for AI-assisted test generationCoach engineers on writing effective tests through reviews and pairing, so that each team owns the quality of its own codeBuild production-adjacent checks: post-deploy smoke tests, synthetic transactions, automated verification before traffic is switched to a serviceRequired Qualifications5+ 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 TypeScriptExperience building test frameworks and harnesses from scratch, not only writing tests on top of existing onesHands-on experience with a modern automation framework, i.e. PlaywrightExperience designing test stages in CI/CD pipelines (e.g. GitLab CI), including parallelization and selective test executionAPI testing and mocking/stubbing of third-party servicesProficient daily use of AI coding tools, with the ability to review AI-generated code quickly and criticallyPrior 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 roleHigh agency: this is a horizontal role without daily supervision; you find testing friction yourself, decide what to build, and defend its priorityStrong written and verbal communication in EnglishPreferred ExperienceFintech, payments, or crypto domain; understanding of testing money flows: idempotency, reconciliation, state machinesContract testing tooling (e.g. Pact or similar)Performance and load testingExperience working in a regulated environment (financial services, healthcare)Test management tooling such as TestRailReporting StructureReports to: Engineering Manager. You will align testing strategy with our QA Lead.Why This RoleBuild the test infrastructure of a crypto payment platform from scratch, with a greenfield platform as your first adopterYour framework multiplies the output of every engineer in the organizationAI-first engineering culture: your test patterns directly power AI-assisted developmentLocationRemote. EU, USA, Argentina, Brazil. A minimum of 4 hours of daily overlap with Central European working hours is required.Compensation and BenefitsAs an independent contractor, you'll enjoy the flexibility to determine how and when you deliver your work, while partnering closely with our team to meet agreed milestones and business objectives. Compensation and engagement terms will be outlined in your contractor agreement.Additional BenefitsCompany issued laptopTechnology AccessoriesAnnual In-Person Full-Team Meetup Cyclops Inc