Strong Middle Flutter Developer

Madfish; United Kingdom; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A top-tier technology company in the United Kingdom is looking for an experienced mobile developer to take charge of the development and maintenance of cross-platform applications using Flutter. Candidates should have over 5 years of experience in Flutter and Dart, excellent knowledge of RESTful APIs, and a strong sense of ownership. You'll work closely with designers and backend developers to create cutting-edge applications while mentoring junior developers. This role offers a flexible schedule and a modern office in the city center.

Benefits

Flexible schedule

Modern office

No bureaucracy

Team events

Equal pay policy

Qualifications

• 5+ years of experience with Flutter and Dart in production.
• Upper-Intermediate English level.
• Deep understanding of BLoC and Cubit.
• Strong knowledge of app performance optimization.
• Hands-on experience with Firebase services.

Responsibilities

• Lead the development of cross-platform mobile applications.
• Collaborate with UI/UX designers and product stakeholders.
• Design and maintain scalable architecture.
• Integrate complex RESTful APIs and third-party services.
• Mentor mid-level developers and ensure code quality.

Skills

Flutter development

Dart programming

RESTful APIs

BLoC architecture

CI/CD systems

Unit testing

Performance optimization

JSON serialization

Dependency injection

Firebase services

Job description

Your responsibilities will include:

• Leading the development and maintenance of cross-platform mobile applications for iOS and Android using Flutter;
• Collaborating closely with UI/UX designers, backend developers, and product stakeholders to deliver features end-to-end;
• Designing and maintaining scalable architecture, writing clean, maintainable, and efficient Dart code following advanced best practices;
• Integrating complex RESTful APIs, third-party services, and SDKs (e.g., Firebase, authentication providers, payment services);
• Driving and participating in code reviews, architectural discussions, and technical decision-making;
• Profiling, debugging, and optimizing performance across a wide range of devices;
• Setting up and improving CI/CD workflows, automated build processes, and deployment pipelines;
• Preparing and submitting builds to the App Store and Google Play, ensuring compliance with platform requirements;
• Mentoring mid-level developers, supporting feature design, and improving team code quality;
• Writing and maintaining unit, widget, and integration tests to ensure code reliability.

What we expect from you:

• 5+ years of experience with Flutter and Dart in production;
• Upper-Intermediate+ English level;
• Deep understanding and practical experience with BLoC, Cubit, dependency injection, and layered architecture;
• Strong experience working with RESTful APIs, JSON serialization, and advanced API integration patterns;
• Confident experience with navigation packages such as auto_route or go_router, including nested and guarded flows;
• Proven experience delivering mobile applications from concept to release on both the App Store and Google Play;
• Strong knowledge of app performance optimization, memory management, and rendering behavior;
• Hands-on experience with Firebase services (Auth, Messaging, Analytics, Crashlytics) and other third-party SDK integrations;
• Experience integrating payment services and handling secure transactional flows;
• Experience working with WebView-based flows, JavaScript handlers, and hybrid navigation scenarios;
• Confident experience working with device capabilities: permissions, camera, file storage, contact access, and platform-specific APIs;
• Strong understanding of deep linking, referral flows, and dynamic navigation through external links;
• Experience working with CI/CD systems, automated testing, code generation, and build pipelines;
• Ability to conduct thorough code reviews, lead architectural improvements, and mentor other developers;
• A strong sense of ownership, ability to work independently, and readiness to communicate directly with stakeholders.

We offer:

• Work in a Top-employee company (according to DOU 2025);
• Projects that will challenge and inspire you — both professionally and personally (and bring our win closer );
• A team of creative, empathetic, and proactive people who love what they do;
• Flexible schedule and full-time workload — we value results, not clocks or locations;
• A cozy and modern office in the city center (Chykalenka str) with generator & battery backup, and the freedom to work from home when needed;
• No bureaucracy. Just people who care and give feedback;
• Equal pay policy;
• Trial period (usually ~2 months — but it’s up to you how fast you fly through it );
• Events, hangouts, online fun, and good vibes.