Senior Flutter Developer

ZUS COFFEE; Selangor; Presencial; MYR 120.000 - 180.000; Jornada completa

Descripción de la vacante

ZUS COFFEE seeks a Senior Flutter Developer to own the design, development, and delivery of features for our consumer mobile app on iOS and Android from a single Flutter codebase.

You will shape requirements into robust, scalable implementations, maintaining high code quality while mentoring peers and driving platform integrations, performance, and reliable releases.

Formación

• 6–10 years of software engineering experience, with 4+ years building production Flutter applications.
• Track record of owning significant features end-to-end, not just contributing to them.
• Experience in product-driven or startup environments with evolving requirements.
• Strong proficiency in Dart and Flutter with production-grade apps shipped to both iOS and Android.
• Experience with RESTful API integration, serialization, error handling, and offline/caching strategies.
• Hands-on experience with production monitoring, crash reporting, and analytics.

Responsabilidades

• Feature development and implementation on the Flutter app, from requirements through production on both App Store and Play Store
• Architecture decisions within the Flutter layer: module boundaries, state management, navigation, and data flow
• Integration with backend APIs — including shaping contracts with backend engineers before implementation begins
• Platform integration where Flutter alone is not enough: platform channels, native SDKs, and plugin maintenance
• App performance and reliability: crash-free rate, frame rendering (jank), startup time, memory and battery efficiency
• Release health across both stores: signing, build flavours, environment management, TestFlight and Play Console tracks, staged rollouts, and hotfixes
• Production incident ownership: root-cause analysis to lasting fixes
• Continuous improvement of the codebase: refactoring and paying down tech debt
• Code review, mentoring of mid-level engineers, and contribution to Flutter engineering standards

Conocimientos

Flutter ownership

End-to-end ownership

Code quality

Mentoring

Herramientas

Dart

Flutter

REST APIs

Descripción del empleo

We are looking for a Senior Flutter Developer to own the design, development, and delivery of features on our consumer mobile application, shipped to both iOS and Android from a single Flutter codebase.

This is not a "build to spec" role. This is a senior feature ownership role where you take product requirements and translate them into a reliable, polished experience on both platforms — and raise the quality bar of the codebase while you do it. You will be the person who thinks past the ticket — designing implementations that hold up under real-world conditions, across a wide range of devices and OS versions, and that other engineers can confidently build on.

• Feature development and implementation on the Flutter app, from requirements through production on both App Store and Play Store
• Architecture decisions within the Flutter layer: module boundaries, state management, navigation, and data flow
• Integration with backend APIs — including shaping contracts with backend engineers before implementation begins
• Platform integration where Flutter alone is not enough: platform channels, native SDKs, and plugin maintenance
• App performance and reliability: crash-free rate, frame rendering (jank), startup time, memory and battery efficiency
• Release health across both stores: signing, build flavours, environment management, TestFlight and Play Console tracks, staged rollouts, and hotfixes
• Production incident ownership: leading diagnosis of crashes, ANRs, and defects through root cause analysis to lasting fixes, not just patches
• Continuous improvement of the codebase: refactoring, modernising legacy modules, and paying down tech debt as part of regular delivery, not as a separate project
• Code review, technical mentoring of mid-level engineers, and contribution to Flutter engineering standards

Qualifications & Education

• 6–10 years of software engineering experience, with 4+ years building production Flutter applications
• Demonstrated experience owning significant features or modules end-to-end, not just contributing to them
• Track record of improving a codebase — reducing crashes, paying down tech debt, or introducing standards others adopted
• Experience working in product-driven or startup environments with evolving requirements
• Strong proficiency in Dart and Flutter with production-grade apps shipped to both iOS and Android
• Deep, hands-on experience with at least one state management approach at scale (Bloc/Cubit, Riverpod, or equivalent) — and a clear view on the trade-offs between them
• Strong understanding of Flutter architecture patterns (Clean Architecture, feature-based modularisation, dependency injection)
• Solid understanding of the Flutter rendering pipeline: widget rebuilds, keys, isolates, and diagnosing jank with DevTools
• Experience writing platform channels or integrating native SDKs, with working knowledge of Swift/Kotlin when the problem demands it
• Experience with RESTful API integration, serialisation, error handling, and offline/caching strategies
• Practical experience with automated testing in Flutter (unit, widget, and integration/golden tests) and mobile CI/CD (Codemagic, Fastlane, GitHub Actions, or equivalent)
• Hands-on experience with production monitoring, crash reporting, and analytics (Crashlytics, Sentry, Datadog RUM, or equivalent) — using the data to prioritise fixes and decide what stays
• Solid grasp of mobile security: secure storage, certificate pinning, token handling, and protecting personal data on device

Engineering Collaboration Skills

• Ability to review and shape API contracts with backend engineers before implementation begins
• Strong written communication across distributed, cross-functional teams — your technical decisions should be legible to both Product and Engineering
• Ability to work with Design to surface implementation constraints early — not after a feature has been built the wrong way
• Ability to work with QA on test strategy and edge cases before release, not only when fixing reported bugs
• Willingness to mentor — reviewing code to teach, not just to approve

Nice to Have

• High-transaction consumer apps in F&B, e-commerce, logistics, or similar (ordering, loyalty, delivery), including payment gateway integration and payment flows (3DS, redirects, failure/retry states)
• Experience building apps that support multiple regions: localisation, currencies, region-specific configuration and feature availability
• Experience with offline-first architectures or complex local/remote sync patterns
• Experience shipping features behind feature flags or A/B tests
• Experience with super app patterns, modular Flutter packages, or add-to-app integration
• Experience building custom native modules beyond basic platform channels (e.g. WidgetKit, CoreLocation, Live Activities on iOS; custom Android SDKs or background services)
• Effective use of AI-assisted development tools, with the judgement to review and own what they produce