Senior Flutter Developer

Job Description: Senior Flutter Developer
Experience: 5–8 Years (with strong hands-on Flutter experience)

Xtrm is a global fintech payments company.

We’ve built a next-generation platform and embedded payment API designed around an intelligent wallet architecture that allows businesses of all kinds to receive, manage, exchange and send money all over the world. Xtrm operates using a fully distributed team spanning many countries. We are a high growth company, with over 25,000 global customers.

We are looking for an experienced Senior Flutter Developer to lead the development of our cross-platform mobile application for Android and iOS, serving remitters and beneficiaries across different countries.
The ideal candidate should have strong expertise in Flutter and Dart, hands-on experience with native Android and iOS integrations, and a good understanding of mobile application security, performance optimization and fintech application development.

Key Responsibilities

• Lead the architecture, development and maintenance of cross-platform mobile applications using Flutter and Dart.
• Design and develop secure, scalable, responsive and high-performance mobile applications for Android and iOS.
• Build and maintain reusable UI components and ensure a consistent user experience across platforms.
• Integrate RESTful APIs and backend services to support wallet management, money transfers, beneficiary management, transaction tracking and payment notifications.
• Integrate third-party SDKs for KYC verification, identity verification, document capture, face verification and liveness detection.
• Implement secure authentication, biometric authentication and secure data storage.
• Implement mobile application security practices, including certificate pinning, device integrity checks and protection against rooted or jailbroken devices.
• Develop and maintain native integrations using Swift (iOS) and Kotlin (Android) through Flutter platform channels and custom plugins.
• Manage application builds, testing, deployment and releases to Google Play Store and Apple App Store.
• Optimize application performance, troubleshoot technical issues and ensure compatibility across different devices and operating system versions.
• Collaborate with backend developers, Angular web developers, UI/UX designers, QA engineers and product teams.
• Conduct code reviews, establish coding standards and mentor junior developers.
• Work with CI/CD pipelines and support continuous integration and delivery processes.

Required Skills and Qualifications

• Strong hands-on experience in Flutter and Dart development.
• Proven experience developing and publishing mobile applications on both Google Play Store and Apple App Store.
• Strong understanding of mobile application architecture, design patterns and state management solutions such as BLoC, Provider or Riverpod.
• Experience integrating RESTful APIs, JSON and third-party services.
• Hands-on experience with native Android development using Kotlin and iOS development using Swift.
• Experience developing Flutter platform channels and custom native plugins.
• Strong knowledge of mobile application security, authentication, encryption and secure data handling.
• Experience with secure storage solutions, biometric authentication and mobile application protection.
• Experience with Firebase, push notifications and application performance optimization.
• Familiarity with Git, CI/CD pipelines, debugging tools and mobile application testing.
• Strong problem-solving, communication and collaboration skills.
  

Good to Have

• Experience in fintech, banking, payment processing, digital wallets or money transfer applications.
• Experience integrating KYC, identity verification, payment gateway and document verification SDKs.
• Knowledge of Apple App Attest and Google Play Integrity.
• Experience with certificate pinning, root detection and jailbreak detection.
• Familiarity with Android Keystore and Apple Keychain for secure data storage.
• Understanding of Angular, TypeScript and web application development.
• Experience working with Angular-based web platforms and integrating mobile applications with shared backend APIs.
• Familiarity with OpenAPI specifications and API client generation.
• Understanding of localization, multi-currency applications and international payment workflows.
• Experience with cloud-based mobile device testing platforms.

Preferred Candidate Profile

• Experience building and maintaining production-grade cross-platform mobile applications.
• Ability to independently handle mobile application architecture and technical decision
• Comfortable working with both Flutter and native Android/iOS technologies.
• Experience handling mobile application security and third-party SDK integrations.
• Ability to collaborate with cross-functional teams and mentor junior developers.