Senior Mobile Engineer (Flutter + iOS)

Our client is a leading, fully regulated US-based digital asset trading platform. They provide secure, low-latency access to cryptocurrency markets, acting as a bridge between traditional finance and the Web3 ecosystem.

The Senior Software Engineer will play a pivotal role in transitioning the core mobile platform from native environments to a unified Flutter/Dart codebase. You will maintain the stability of the existing production iOS app while architecting and developing robust, scalable cross-platform features, ensuring a seamless migration process.

Key Responsibilities:

• Maintain, enhance, and support our production native iOS application written in Swift.
• Collaborate on the design and development of a new Flutter/Dart codebase, ensuring performance and scalability.
• Build cross-platform mobile features in partnership with Android engineers, backend developers, and product teams.
• Contribute to shared tooling, CI/CD pipelines, and deployment workflows.
• Uphold high engineering standards and best practices throughout the hybrid mobile migration.
• Troubleshoot and resolve integration, compatibility, and performance issues in both native and cross-platform stacks.
• Provide mentorship to fellow mobile engineers, especially on iOS and native integrations.

Required Qualifications:

• 5+ years of professional mobile development experience, including 3+ years of iOS development using Swift.
• At least 1-2 years of hands-on experience with Flutter/Dart or demonstrated ability to adopt new cross-platform technologies.
• Experience supporting production iOS apps through multiple OS cycles.
• Understanding of platform interoperability, including Flutter platform channels and native SDK integration.
• Proficiency in CI/CD and release workflows: Fastlane, App Store Connect, TestFlight.
• Familiarity with performance monitoring tools like Xcode Instruments, Flutter DevTools, and Firebase.
• Strong architectural judgment, especially in platform migrations or codebase rewrites.

Preferred Qualifications:

• Exposure to Android development (Kotlin) and full cross-platform transitions.