{"id":3039017,"url":"https://alion.io/job/xflow-flutter-developer","title":"Flutter Developer","company":{"id":4431640,"name":"Xflow","domain":"xflow.com","url":"https://alion.io/company/xflow-com","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"BambooHR","truth_index":null},"role":"Mobile","role_family":"Mobile","seniority":null,"employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":51000,"max_usd":95000,"period":"year","method":"role_country_seniority_unknown","sample_n":121},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Adaptive UI","optional":false},{"name":"Bloc","optional":false},{"name":"Clean Architecture","optional":false},{"name":"Dart","optional":false},{"name":"Flutter","optional":false},{"name":"State Management","optional":false}],"status":"live","first_seen_at":"2026-06-12T00:00:00Z","employer_posted_date":"2026-06-12","last_verified_at":"2026-10-24T02:26:10Z","board_verified":true,"closed_at":null,"days_open":134,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":134},"description":"X-FLOWis a mobile game development company established in 2018. We gained recognition after the release of Happy Color, the most popular digital coloring book and one of the most successful ad-driven mobile apps in the world.\nWe are looking for aFlutter Developerfor our flagship project, Happy Color,and for development of new projects.\nKey Responsibilities:\nDevelop and maintain high-quality Flutter applications with a focus on performance, stability, and clean architecture.\nImplement adaptive, responsive UI and complex animations with pixel-perfect precision.\nDesign modular and testable architectures.\nIdentify and fix performance bottlenecks (scrolling, rendering, rebuilds).\nCollaborate closely with designers and backend engineers to deliver smooth UX across iOS and Android.\nContinuously improve code quality through reviews, refactoring, and automated testing.\nRequirements:\n4+ years of Flutter/Dart experiencewith solid understanding of widget lifecycle, state management, and animation system.\nStrong knowledge ofFlutter SDK(animations, adaptive UI, rendering, performance tuning).\nProficiency inDart(async programming, isolates, generics, mixins).\nExperience buildingcustom UI components,pixel-perfect layouts, andsmooth 60/120 FPS animations.\nDeep understanding of Bloc / Cubit / Providerand clean architectural principles (SOLID, Clean Architecture).\nHands-on experience withFlutter DevToolsfor performance profiling and optimization (scroll, rebuilds, memory).\nAbility to integrateFirebase, analytics, in-app purchases, and push notifications.\nUnderstanding ofAndroid/iOS ecosystemsand platform channels for native integrations.\nExperience writing and maintainingunit and integration tests.\nRussian - 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