My food-ordering app is already live on both the Apple App Store and Google Play. I will provide the complete Flutter front-end and Laravel back-end source, along with current store credentials. What I need now is a hands-on developer who can streamline the online payment flow—specifically, cut down the transaction time from the moment a customer taps “Pay” until confirmation appears—then produce fresh production builds and submit them to both stores. Scope of work • Review the existing Flutter checkout screens, Dart services, and the Laravel payment API. • Pinpoint and refactor any latency bottlenecks (network calls, serialization, DB look-ups, third-party SDK latency, etc.). • Where viable, introduce caching, parallel requests, or optimized queries so the entire payment round-trip feels markedly faster to end users. • Keep current payment gateways intact; no new integrations are required unless you see a quick win that shaves noticeable time. • Incrementally test with real and sandbox cards so we avoid any regressions in security or functionality. • Once satisfied, generate Release builds, pass both store reviews, and push the updates live. Deliverables 1. Optimized Flutter code and Laravel endpoints committed back to the repo. 2. Before-and-after timing report (ms) for each payment step. 3. iOS and Android release binaries successfully uploaded and approved. 4. One-page summary of changes for future maintenance. Tech stack keywords: Flutter 3.x, Dart, Laravel 10, PHP 8, REST, App Store Connect, Google Play Console, Xcode, Android Studio, Git. Acceptance criteria The new payment flow must complete, on average, at least 30 % faster than the current production build on both iOS and Android, with zero failed or duplicated transactions during a 100-order stress test. If you’re confident you can deliver measurable speed gains and manage the full publish cycle, I’m ready to share the repo and store access right away.