QA Engineer

Ostium is on a simple mission: make it possible for anyone with a digital wallet to trade stocks, commodities, currencies, and crypto with full transparency. No brokers, no freezes, no hidden spreads. We're replacing the opaque, offshore brokerage model with a transparent, permissionless trading stack built onchain. Every trade, deposit, and withdrawal is verifiable through open, auditable code. We've raised $27.9M+ from General Catalyst, Jump, LocalGlobe, Susquehanna (SIG), GSR, Alliance DAO, Soma Capital, Balaji Srinivasan, Meltem Demirors, and others.QA Engineer (Remote / Full-Time)We're hiring a QA engineer (2-4 years experience) who understands DeFi. You'll own quality across our web and mobile frontends, not just running test cases, but thinking like a user who has real money on the line. You need to understand how perpetual trading works, what leverage means, how wallets connect, how transactions flow and where all of that can break.ResponsibilitiesOwn quality across web and mobile frontendsThink like a real user with money on the line - hunt for edge cases, broken flows, and UX frictionWrite and maintain automated test suites for the web app (Cypress, Playwright, or similar)Test DeFi-specific flows - wallet connections, approvals, order types, transaction states, network switchingFile detailed, actionable bug reports with reproduction steps engineers can immediately act onUse browser dev tools and logs to investigate issues beyond surface-level symptomsWork with engineering to verify fixes, catch regressions, and validate releases before they shipHelp build and improve CI-integrated test pipelines over timeRequirementsSolid experience testing web and mobile applications.Familiar with DeFi primitives like wallets, approvals, order types, on-chain vs off-chain flows, network switching, transaction states.You should be able to look at a trading interface and intuitively know what edge cases to hunt for.Experience with automation testing on web apps (Cypress, Playwright, or similar), writing and maintaining test suites, not just manual passes.Comfortable reading logs, using browser dev tools, and filing bugs that engineers can actually act on.Nice to haveExperience testing across multiple chains or L2s.Familiarity with mobile testing frameworks (Detox, Appium).Basic scripting ability (JS/TS or Python).Experience with CI-integrated test pipelines.BenefitsCompetitive compensation packageOpportunity to work with cutting-edge blockchain technologyCollaborative environment with highly skilled team membersFlexible work arrangementsProfessional development opportunitiesYou're the person who finds the bug everyone else missed because you actually used the product like a real user would. You take ownership of quality and not just flagging issues but following them through to resolution. You're curious about how things work under the hood, even if you're not writing the code. High agency while obsessed with getting the details right.