Senior Mobile Engineer (Flutter + iOS)

Nix

European Union; LATAM; Ukraine (European Union, LATAM, Ukraine) Remote permanent

Posted: March 18, 2026

Required Skills

Job Description

N-iX is a global software development service company that helps businesses across the globe create next-generation software products. Founded in 2002, we unite 2,400+ tech-savvy professionals across 40+ countries, working on impactful projects for industry leaders and Fortune 500 companies. Our expertise spans cloud, data, AI/ML, embedded software, IoT, and more, driving digital transformation across finance, manufacturing, telecom, healthcare, and other industries. Join N-iX and become part of a team where your ideas make a real impact.

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.

We offer*:

• Flexible working format - remote, office-based or flexible

• A competitive salary and good compensation package

• Personalized career growth

• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)

• Active tech communities with regular knowledge sharing

• Education reimbursement

• Memorable anniversary presents

• Corporate events and team buildings

• Other location-specific benefits

*not applicable for freelancers

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