Senior Flutter Developer

About the role
We're building a mobile-first financial product from the ground up — a consumer fintech app where people deposit funds, get a Visa/Mastercard card, send money to each other and trade all in one place. It's an early-stage product with serious ambition and we want a senior Flutter engineer who has shipped complex high-stakes mobile apps and wants real ownership of how this one gets built.
This is hands-on engineering not a management seat. You'll own core flows end to end, make architecture calls and set the quality bar on a product where a bug can cost a user real money.

What you'll do

• Build and ship features across iOS and Android from a single Flutter codebase.
• Own critical flows: onboarding and KYC, wallet and deposits, card management, P2P transfers and the trading screens.
• Implement strong app-side security — secure storage, biometric login, certificate pinning and obfuscation.
• Integrate REST and WebSocket APIs for real-time balances, prices and order updates. • Set up a clean, testable architecture and a solid CI/CD pipeline for fast, safe releases. • Run A/B tests and staged rollouts so we ship changes based on data, not guesses.

Tech you'll work with

• Mobile: Flutter, Dart, Bloc or Riverpod, Clean Architecture (feature-based / modular), go_router.
• Networking & data: Dio + Retrofit, freezed / json_serializable, flutter_secure_storage, Hive / Isar / Drift.
• Security: TLS / certificate pinning, biometric auth (Face ID / fingerprint), AES-256, code obfuscation, Play Integrity / App Attest, 3D Secure.
• Payments & identity: Apple Pay / Google Pay, KYC/AML SDKs (Sumsub, Onfido, or similar), card-issuing and payment-gateway integrations.
• Real-time & charts: WebSockets, fl_chart / Syncfusion charts, push notifications (FCM / APNs).
• Experimentation & analytics: Firebase Remote Config + A/B Testing, feature flags, Firebase Analytics / Amplitude, Crashlytics / Sentry.
• CI/CD & testing: Codemagic or GitHub Actions, Fastlane, Shorebird (code push), unit / widget / integration tests.

What we're looking for

• 5+ years in mobile development, with strong, recent Flutter experience.
• At least one complex production app you can show us — ideally fintech, payments, betting or trading, but other real-money or high-traffic domains count too (betting, large-scale e commerce, etc.).
• A solid grasp of mobile security and handling sensitive user data.
• Real experience with state management, clean architecture and automated testing. • Comfortable owning features end to end in a small, fast-moving team.
• Good written English for async, remote work.

Nice to have: payments or KYC integrations, WebSocket-heavy real-time apps, trading/charting UIs and full App Store / Play Store release ownership.