Flutter Developer (Expert Fixer Needed) — Paid Probation Contract → (Long-Term + Partnership) Path - Contract to Hire

We’re a fast-growing, logistics-centric on-demand app in Saudi Arabia : customers order services in the app, and our own fleet goes out to pick up, deliver, and serve them. The product is live, customers are using it, and we’re scaling fast. We have a lot of features to build — but not yet. Right now we don’t need a “feature factory.” We need a fixer ; someone who can stabilize, speed up, clean up, and ship with real ownership. Once the foundation is solid (performance, crashes, reliability), we’ll switch into feature factory mode ⚡ and start expanding aggressively. This starts as a paid probation contract (trial phase on Upwork) ✅. If you perform, this can convert into a long-term engagement and potentially full-time + ownership (for top performers who consistently deliver and take ownership). What you’ll fix / own - App performance (startup time, jank, memory leaks) - Crash reduction and production stability - Maps reliability (markers/polylines, location accuracy, tracking edge cases) - Clean architecture + maintainability (less spaghetti, more structure) - Faster shipping with fewer regressions - Pixel-perfect UI implementation from Figma ; faithfully matching designs and ensuring layouts look correct across all phone sizes and devices (responsive, consistent spacing/typography, no UI breakage) Responsibilities - Build and maintain Flutter (Dart) features with production-quality standards - Implement and harden Google Maps flows: markers, polylines, real-time location tracking - Improve navigation + route optimization and execution logic to reduce errors in real-world usage - Work with Firebase (Auth, Firestore/Realtime DB, Cloud Functions, Push Notifications) - Implement Mixpanel for in-app user tracking (events, funnels, drop-offs) to improve conversion and retention - Implement AppsFlyer and integrate it with Mixpanel to track acquisition sources (campaign attribution/deep links) so we can optimize marketing spend and ROI - Debug fast, write clean fixes, and prevent repeat issues with sensible patterns - Collaborate with backend/design to deliver smooth, consistent UX Requirements (non-negotiable) - Strong Flutter/Dart production experience - Solid Google Maps + location services experience (real-world, not toy demos) - Firebase integration experience and good architectural judgment - Can diagnose performance problems (profiling, rendering, memory) and actually fix them - Writes maintainable code and communicates clearly (what you found, what you changed, what you’ll do next) - Logistics / delivery / real-time tracking apps experience - State management: Riverpod / Bloc / Provider - Crash/perf tooling experience (Crashlytics, structured logging) Paid probation (how we start) ✅ We’ll begin with a short paid probation scope (milestone-based). If you prove you can stabilize + improve the app quickly, we’ll expand scope and discuss a long-term & ownership path . To apply Send 2–3 examples of Flutter apps you’ve shipped + a short note on the hardest performance/stability problem you fixed (what it was, how you diagnosed it, and the result). Apply tot his job