Senior Flutter Developer

Senior Flutter DeveloperLocation: RemoteContract: PJ (full-time)Level: SeniorWe're building a virtual office platform for remote and hybrid teams.It brings together persistent rooms, real-time presence, audio/video (WebRTC), chat, screen sharing, collaborative boards, and immersive spaces to boost connection, productivity, and team cohesion — all in one place.The RoleWe're looking for a Senior Flutter Developer focused on macOS Desktop to build and evolve our desktop client.You'll ship a high-performance, stable, and well-instrumented app that integrates video/audio, real-time features, and collaborative tools—while keeping top-tier code quality, testing, and documentation.Secondary scope: help maintain Android and iOS builds (feature parity, fixes, and releases).What You'll Do- Design, build, and maintain the Flutter macOS app with clean architecture, modular layers, and reliable state management.- Integrate RESTful APIs and real-time services (e.g., WebSockets/Streams).- Implement A/V features (e.g., flutter_webrtc): device selection, camera/mic permissions, I/O routing, and stability under variable networks.- Ensure observability end to end: instrument product events/metrics; triage errors with Sentry; capture UX signals with Microsoft Clarity (session replay/heatmaps) where applicable (web/embedded views); analyze performance traces and dashboards.- Own quality: unit, widget, and integration tests; CI checks; code reviews; technical docs.- Handle macOS distribution: code signing & notarization, entitlements, Hardened Runtime, App Sandbox, Keychain; package DMG/PKG; manage auto-update (e.g., Sparkle).- Collaborate with Product/Design/QA to refine requirements, edge cases, and acceptance criteria; keep specs tidy in Confluence and PRs clear.- Team rituals & reporting:- Attend daily standups in English and other ceremonies (planning, grooming, demos, retros).- Keep Jira up to date (status, links, attachments) and log time entries (work logs) per task.- Submit an end-of-day (EOD) daily report in English including: hours worked (per task), what was completed, current task & ETA, blockers, and plan for tomorrow.- Secondary (Android & iOS): maintain parity when applicable, fix platform-specific issues, help with CI/CD and store releases, monitor crashes/perf via Sentry and review UX insights with Clarity when relevant.CPU & GPU Optimizations (primary focus)CPU- Minimize rebuilds: effective state selection (BLoC/Riverpod/Provider), const constructors, proper Keys, split large widgets.- Cut redundant layout/work: avoid heavy logic in build, cache computed values, reduce intrinsic measurements, coalesce events, debounce/throttle streams.- Move heavy tasks off the UI thread: isolates (compute/custom), lazy JSON parsing, incremental work units.- Frame scheduling discipline: prevent setState loops; render only when state actually changes.GPU- Reduce overdraw/repaints: place RepaintBoundary wisely; optimize CustomPainter (shouldRepaint); avoid large Opacity on complex subtrees.- Avoid expensive effects: minimize saveLayer, heavy blurs/gradients and big shadows.- Use right-sized images & filterQuality (low/none when acceptable); limit transforms on large layers.- Shader jank control: warm up shaders / capture SkSL where applicable; keep fragment shaders simple.- Pause/disable animations when off-screen; keep animation count/area minimal.Measurement & Guardrails:- Profile with Flutter DevTools (CPU/GPU/frame timeline) and add perf budgets (avg CPU%/GPU frame time) to CI gates.- Track before/after metrics per feature; regressions must be fixed before release.Must-Haves- Fluent English (spoken and written): comfortable in daily English standups and writing EOD reports.- Strong experience with Flutter and Dart building Desktop apps (preferably macOS).- Proven work reducing CPU/GPU usage in Flutter apps (ideally desktop/macOS) with measurable before/after results.- Solid grasp of architectural patterns (MVC/MVVM/Clean), DI, and state management (BLoC/Riverpod/Provider).- Hands-on with RESTful APIs, WebSockets/Streams, async/isolates, and robust error handling.- Firebase (Auth, Firestore, Analytics) or equivalent, Microsoft Clarity (for UX/session insights in web-embedded contexts), and Sentry for error/performance monitoring.- Git proficiency, code reviews, CI (e.g., GitHub Actions/GitLab CI), and Jira work logs/time tracking.Nice to Have- Deep macOS expertise: signing, notarization, App Sandbox, entitlements, Keychain, packaging, and updater pipelines.- Practical WebRTC experience; spatial audio; jitter/latency tuning.- Android/iOS publishing (fastlane or equivalent), push notifications, and in-app review flows.- Docker, CDN, and networking basics for real-time apps.- Accessibility (VoiceOver/TalkBack) and internationalization.Benefits & Environment- Remote-first, flexible hours, and competitive market range.- Fast feedback loops, ownership, and a product with real impact on how teams work every day.- Support for learning, events, and continuous improvement.