flutter mobile app developer-Background GPS & Geofencing ios + android

ZONE PAY ALERT — FLUTTER MOBILE APP DEVELOPER NEEDED iOS + Android | Background GPS | Fixed Price Project --- OVERVIEW I am looking for an experienced Flutter developer to build a mobile app called Zone Pay Alert for both iOS and Android. This is a fixed-price project with clear milestones. All intellectual property belongs to me. I need someone who has specifically built apps with background GPS and geofencing before — not someone who will learn on my project. --- WHAT THE APP DOES Zone Pay Alert is a utility app for union trade workers. Workers set up their own zone configuration (reference point address, zone distances, and pay values). The app then: 1. Calculates straight-line distance (as the crow flies) from the reference point to any jobsite address 2. Returns the worker's zone classification instantly 3. Runs live GPS in the background during the morning commute and sends a push notification each time the worker crosses a zone boundary 4. Calculates total zone pay earned based on days worked per zone --- CORE FEATURES REQUIRED - Google Places address autocomplete for jobsite lookup - Haversine formula straight-line distance calculation - User-configurable zone setup (up to 5 zones, custom distances and pay values) - Live background GPS geofencing with push notifications at each zone boundary crossing - Home address exclusion — no alerts when driving locally - Pay calculator — days per zone, total zone pay earned - Shareable zone configurations between users - Annual subscription via App Store and Google Play ($9.99/year) - ZERO data collection — all location processing on device only, nothing transmitted to any server ever --- TECHNICAL REQUIREMENTS - Built in Flutter (single codebase for iOS and Android) - Background GPS must survive full commute on both platforms — developer must handle iOS background location permissions and Android battery optimization exceptions specifically - Google Places API integration - Push notification system - In-app subscription via RevenueCat or similar - Privacy-first architecture — no backend user data storage of any kind - Clean, dark UI — blue collar, functional, no fluff --- DELIVERABLES - Complete Flutter source code (I own all IP) - Working iOS build submitted to Apple App Store - Working Android build submitted to Google Play - Documentation for ongoing maintenance - 30 days post-launch bug support --- MILESTONES (suggested) Milestone 1 — Core zone lookup and calculator working on both platforms — 25% Milestone 2 — Background GPS geofencing and push notifications working on both platforms — 35% Milestone 3 — Google Places autocomplete, subscription integration, full UI complete — 25% Milestone 4 — App Store and Google Play submission, approved and live — 15% --- BUDGET $3,000 — $6,000 fixed price depending on experience and timeline. I will not pay hourly. Fixed price only. Milestones only. No exceptions. --- TIMELINE 6-8 weeks from start to App Store submission. --- WHO I AM LOOKING FOR - Demonstrated Flutter experience — show me apps you have built and published - Must have specifically built background GPS or geofencing apps before — show me examples - Strong communication — weekly updates minimum - Fluent English - Available to start immediately --- WHO I AM NOT LOOKING FOR - Developers who will subcontract this work - Developers learning Flutter on my project - Hourly billing - Vague timelines --- TO APPLY Tell me specifically about a background GPS or geofencing app you have built and published. Include a link to the app in the store. Applications without this will not be considered. --- CONFIDENTIALITY I will require a signed NDA before sharing full project details. This is a proprietary product concept.