{"id":650204,"url":"https://alion.io/job/trading-212-senior-frontend-engineer","title":"Senior Frontend Engineer","company":{"id":51399,"name":"Trading 212","domain":"trading212.com","url":"https://alion.io/company/trading-212","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":80,"open_postings":10,"ghost_share":0,"stale_share":0.8,"repost_share":0,"time_to_fill_p50_days":27,"computed_at":"2026-10-14T06:34:16Z"}},"role":"Frontend","role_family":"Frontend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":["ES"],"hiring_countries_total":1,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Detox","optional":false},{"name":"Jest","optional":false},{"name":"Playwright","optional":false},{"name":"pnpm","optional":false},{"name":"React Native","optional":false},{"name":"State Management","optional":false},{"name":"TypeScript","optional":false},{"name":"Zustand","optional":false},{"name":"JavaScript","optional":true},{"name":"React.js","optional":true}],"status":"live","first_seen_at":"2026-08-25T15:49:22Z","employer_posted_date":"2026-08-25","last_verified_at":"2026-10-15T04:57:58Z","board_verified":true,"closed_at":null,"days_open":50,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":50},"description":"Our mission is to enable everyone to build wealth\nWe reinvent how trading and investing work by creating exceptional products people love.\nThat takes high standards, high velocity and engineers who own what they ship.\nToday, we serve over 6 million clients, with more than €38 billion in assets under management. At that scale, frontend performance, correctness and clarity are part of the product.\nOur frontend platform spans web and mobile: TypeScript, React, React Native and React Native Web in an Nx and pnpm monorepo, with TanStack Query, Zustand, Playwright, Detox and Jest. Around 95% of our code is reused across web and mobile.\nAbout the role\nSenior Frontend Engineers work across our product domains. Your team match will reflect your strengths, interests and where you can contribute most.\nAcross every team, the model is the same: small, autonomous groups, a weekly release cycle and ownership from problem definition through production.\nWhat you’ll do\nOwn complex frontend features end to end across web and mobile.\n\nDesign and evolve React and React Native systems, shared libraries and durable abstractions.\n\nIdentify and resolve rendering, state-management, bundle and runtime-performance bottlenecks.\n\nUse TypeScript to make behaviour explicit and prevent defects rather than suppressing type errors.\n\nWork closely with product, backend engineering and QA to turn complex requirements into simple user experiences.\n\nKeep quality high through code review, unit, end-to-end and visual-regression testing.\n\nShare knowledge, mentor colleagues and raise the frontend engineering standard.\n\nWhat you need to have\nProven ownership of production frontend systems built with React or React Native and TypeScript.\n\nStrong knowledge of React rendering, component boundaries, data flow and state management.\n\nA track record of designing maintainable frontend architecture and reusable abstractions.\n\nPractical experience diagnosing performance problems in complex web or mobile products.\n\nSound testing judgement across unit, end-to-end and visual-regression coverage.\n\nClear, structured problem-solving and the ability to explain technical decisions and trade-offs.\n\nStrong engineering fundamentals, product judgement and confidence learning unfamiliar technologies.\n\n Depth in one frontend ecosystem and sound tool choice matter more than familiarity with every technology listed.\nWhat to expect\nRecruiter conversation\n\nCode Review\n\nExperience Deep Dive\n\nManagerial interview\n\nYour recruiter will explain each stage clearly and follow up after every conversation.\nBring your ambition to Europe’s fastest-growing mobile 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