Senior Full-Stack Flutter Engineer

CodeLions is hiring a Senior Full-Stack Flutter Engineer to own mobile app development with Flutter, backend services with Node.js/NestJS, and web dashboards with React/Next.js. The role involves building cross-platform apps, integrating native features, and reviewing code. The team is international with engineers from Ukraine and client-side specialists.

• Build and maintain high-quality cross-platform apps for iOS and Android with Flutter
• Design, build, and maintain backend services, APIs, and databases
• Develop dashboards, admin panels, and client-facing web apps
• Integrate native Android and iOS features
• Review code and set engineering best practices

• 5+ years of commercial software development experience
• Experience delivering products across mobile, backend, and web
• Upper-Intermediate English or higher
• LLM integration experience (OpenAI, Anthropic, LangChain) or RAG
• Daily use of AI-assisted development tools (Cursor, Claude Code)
• 4+ years with Flutter and Dart, with apps shipped to App Store and Google Play
• Strong experience with Bloc and reactive programming (Streams, RxDart)
• Clean Architecture and code generation (Freezed, json_serializable)
• Native integration through Platform Channels, with solid Kotlin or Swift knowledge
• Push notifications (FCM, APNs, or OneSignal), deep links, and background tasks
• Local storage and offline-first apps (SQLite, Drift, or similar)
• Unit, widget, and integration testing
• 3+ years building backend services with Node.js and TypeScript (NestJS or Express)
• API design with REST and GraphQL, plus real-time communication through WebSockets
• Strong PostgreSQL skills: schema design, query optimization, indexing, migrations
• Redis for caching, pub/sub, and queues
• Experience with NoSQL databases (Firestore, DynamoDB, or MongoDB)
• Authentication and authorization (JWT, OAuth, Firebase Auth, or Cognito)
• Background jobs and message queues (SQS, Kafka, BullMQ, or similar)
• Backend testing with Jest or similar
• 2+ years with React and TypeScript
• Next.js (SSR, routing, API routes)
• State and data management (Redux Toolkit, Zustand, or React Query)
• Responsive, mobile-first layouts
• Building dashboards, including real-time data visualization
• Nice to have: AWS or Firebase/Google Cloud
• Nice to have: Docker and CI/CD (GitHub Actions, Codemagic, or Fastlane)
• Nice to have: Background location tracking, geolocation services, and Google Maps
• Nice to have: Bluetooth, NFC, or QR scanning integrations
• Nice to have: A background in native Android development (Kotlin, Jetpack)
• Nice to have: Microservice architecture and high-load systems
• Nice to have: Infrastructure as Code (CloudFormation, Terraform)
• Nice to have: Dart on the backend (Serverpod, Dart Frog)