Senior Flutter Engineer - Fintech Trading Apps

On The Spot Development; Warszawa; On-site; PLN 300,000 - 420,000; Full time

Benefits offered by this job

Paid vacation 20 days

Sick leave 10 days paid (up to 10 days

5 sick days per year

Luxmed health insurance

Educational costs support

English classes twice a week

Legal and accounting support in Poland

Job summary

Finonex is seeking a senior Flutter Developer to join our Mobile R&D team and help build cutting-edge trading applications across Android and iOS. You will work within a multi-flavor architecture, delivering high-quality features and maintaining code quality in a fast-paced, regulated financial environment.

The role requires strong ownership, clean code, and daily English communication with the Israel-based team, with Sunday-Thursday work alignment.

Qualifications

• 5+ years of professional software development experience.
• 4+ years of hands-on Flutter development on production applications (Flutter as a primary, day-to-day skill).
• Strong command of Dart and modern state management (BLoC, Riverpod, and Provider).
• Solid working experience within multi-flavor / multi-environment Flutter apps.
• Working knowledge of native Android and iOS - build configuration and platform-channel / SDK integration.
• Experience with REST APIs and real-time communication (WebSocket or similar).
• Strong ownership, autonomy, and problem-solving skills.
• Excellent written and verbal English - a must (daily communication with the Israel-based team).
• Availability to work Sunday-Thursday, aligned with the Israeli team - a must.

Responsibilities

• Design, develop, test, and maintain features for Android and iOS in Flutter.
• Write clean, well-structured, testable code following architecture and standards.
• Contribute to integrations such as real-time market data, charting, analytics, and third-party SDKs.
• Work within the multi-flavor / multi-brand build and release process.
• Troubleshoot production issues and keep apps performant and stable.
• Participate in code reviews and write unit/widget/integration tests.
• Collaborate with Product, Design, Backend, and QA to deliver business goals.

Skills

Flutter development

Dart

State management (BLoC/Riverpod/2)

Tools

Firebase suite

ChartIQ

Braze

Mixpanel

AppsFlyer

GitLab CI

Job description

Finonex is seeking a senior Flutter Developer to join our Mobile R&D team and help build cutting-edge trading applications across Android and iOS. You will work within a multi-flavor architecture, delivering high-quality features and maintaining code quality in a fast-paced, regulated financial environment.

The role requires strong ownership, clean code, and daily English communication with the Israel-based team, with Sunday-Thursday work alignment.