BOSS Revolution helps millions of people across the world stay connected with family and friends — through international calling, mobile top-up, and money services. As a Senior Flutter Developer on our DTC Calling team, you'll build and evolve the flagship BOSS Revolution app: a large-scale Flutter product with a deep native calling stack (SIP/VoIP on Android and iOS) at its core.
You'll work in one of the largest Flutter codebases in production — a monorepo of 100+ internal packages, feature-first clean architecture, and a strong engineering culture around code quality, testing, and automation.
What You'll Do:
Hybrid development: Design and build high-performance features in Flutter/Dart, while maintaining and extending the native calling stack — SIP clients, audio handling, CallKit/ConnectionService integration — in Kotlin and Swift, connected via platform channels.
Own features end-to-end within our feature-first clean architecture: Bloc/Cubit state management, repositories, immutable state, and 90%+ unit-test coverage on business logic.
Work at real scale: a melos-managed monorepo with 100+ packages, strict dependency hierarchy, code generation (freezed / json_serializable), and shared design system.
Ensure reliability of a real-time product: monitor releases with Crashlytics and analytics pipelines, investigate call-quality and stability issues, and drive performance optimization.
Contribute to the overall architecture and technical strategy of our mobile platform — from package design to migration of legacy patterns to the current architecture.
Collaborate closely with product managers, backend engineers, QA, and designers as part of a cross-functional product team.
Improve our engineering toolchain: GitHub Actions CI/CD, automated store/TestFlight releases, diff-coverage gates, and code-quality automation.
We're Looking For:
5+ years of experience building large-scale mobile apps, including 3+ years with Flutter.
Strong proficiency in Flutter/Dart with deep understanding of the ecosystem: Bloc/Cubit (or comparable state management), asynchronous programming and isolates, code generation, and dependency injection.
Hands-on experience with native mobile development (Kotlin/Android and/or Swift/iOS) and integrating native code with Flutter via platform channels.
Solid understanding of mobile architecture patterns (clean architecture, modularization), performance optimization, and security best practices.
Strong testing culture: unit and bloc testing with mocked collaborators, deterministic tests, working under coverage gates.
Experience with the full mobile app development lifecycle — from concept to production and post-release monitoring — including Git, CI/CD pipelines (e.g., GitHub Actions), code signing, and deployment automation to the App Store and Google Play.
English: Upper-Intermediate or higher.
It Would Be a Plus:
Experience with VoIP/real-time communication: SIP, WebRTC, CallKit / Telecom framework, push-triggered call handling, audio session management.
Experience working in large monorepos (melos, Mason, or similar tooling).
Knowledge and experience beyond the mobile stack (backend, infrastructure, observability).
Domain experience in telecom, fintech, or other regulated consumer products.
