Mobile Development/Expert/4 hours ago
Our grocery delivery app (about 40k MAU, React Native 0.73) has developed noticeable jank: the product catalog drops frames on mid-range Android devices and cold start takes 6+ seconds. We've profiled enough to suspect over-rendering in our list screens and a bloated startup bundle, but we need someone who has fixed this exact class of problem before.
You would spend roughly three weeks profiling, fixing, and documenting. Concrete targets: cold start under 3 seconds on a Pixel 6a, 60fps scrolling on the catalog screen, and a written summary of the changes so our two in-house devs can keep it fast. The codebase is TypeScript with a GraphQL API via Apollo.
Async-first team, everything in Linear and Slack, one 30-minute sync per week. Timezone flexible.
React NativeTypeScriptGraphQL
Mobile Development/Intermediate/1 day ago
Small nonprofit with a finished React Native app (volunteer shift scheduling for animal shelters) that has lived in Expo Go for six months because nobody on the team has shipped to the stores before. We need someone to carry it over the finish line.
Tasks: production builds via EAS, app signing, store listings (we supply copy and screenshots), privacy questionnaires, push notification certificates, and one round of fixes if either review rejects us. The codebase is TypeScript, small and tidy - about 25 screens, no native modules beyond notifications.
This should be a one-to-two week job for someone who has done it a dozen times. Happy to write a testimonial and refer you to other nonprofits in our network.
React NativeTypeScript
$400.00 - $800.00 fixed price0 bids
Mobile Development/Expert/3 days ago
We run four pilates and strength studios in the Denver area and are replacing our white-label booking app with something we actually own. The current one, built on a franchise platform, is slow, generic, and takes a cut of every transaction.
Scope: a Flutter app for iOS and Android covering class schedules, booking and waitlists, membership purchases and renewals via Stripe, and push reminders two hours before class. Our backend contractor will expose a REST API; you own everything client-side plus the Stripe checkout flow. Figma designs are about 80% done and we can finish the rest with your input.
Working style: a weekly demo call on Thursdays and TestFlight/internal-track builds from week 3 onward. Please share at least one shipped Flutter app with in-app payments when you apply.
FlutterStripe IntegrationUI Design
$4,500.00 - $6,500.00 fixed price0 bids
Mobile Development/Intermediate/3 days ago
An existing React Native app (news reader for a media client) needs two features: robust offline reading and push notifications with topic subscriptions.
Offline mode should download the day's articles and images for flight mode reading, with sensible cache eviction. Push uses Firebase Cloud Messaging; the backend endpoints exist already. The codebase is TypeScript, well tested, around 30k lines.
We will onboard you with a walkthrough call and a staging environment. Please mention similar offline-sync work in your proposal.
React NativeTypeScript
$1,800.00 - $3,000.00 fixed price4 bids
Mobile Development/Expert/9 days ago
Third-generation industrial supplies distributor here, based in Ohio, finally retiring paper pick lists. We need a native Android app that runs on the Zebra TC52 scanners our warehouse crew already carries.
The app needs barcode scanning tied to pick lists, quantity confirmation with over/short flags, offline queueing (our warehouse wifi has dead zones), and sync to our ERP through a REST layer an IT contractor is building in Node.js. Roughly 30 screens per the wireframes - nothing fancy visually, but it has to be fast and fat-finger-proof with gloves on.
Fixed scope, fixed price. A test device ships to you in week 1. Milestones every two weeks with payment on acceptance.
KotlinNode.js
$6,000.00 - $8,000.00 fixed price0 bids
Mobile Development/Intermediate/9 days ago
Bluepeak Media is building a fitness MVP for a consumer brand client. The app tracks workouts, streaks and a simple social feed. We have full designs and a Firebase backend already set up by another contractor.
Scope for the MVP: onboarding, workout logging with templates, streak calendar, push notifications and the feed (read-only for v1). Both iOS and Android from one Flutter codebase.
We care about smooth animations and offline tolerance; gym basements have terrible reception. Store submission support is part of the final milestone.
FlutterUI Design
$4,000.00 - $7,000.00 fixed price2 bids
Mobile Development/Intermediate/17 days ago
Bloom Ledger is a guided journaling app for people managing anxiety - structured prompts, mood tracking, and gentle streaks rather than gamified pressure. The founder (me) is a clinical psychologist; I have the prompt library, the content, and complete Figma files, but no engineer.
Deliverables for v1: onboarding flow, daily prompt engine, mood check-ins with a simple trend view, local-first storage with iCloud sync, and App Store submission. No accounts and no backend for now - everything stays on device. I estimate ten weeks at a part-time pace.
I'm hands-on with product decisions but won't second-guess technical ones. A short weekly Loom walkthrough works better for me than meetings.
SwiftUI Design
$5,000.00 - $7,500.00 fixed price0 bids
Mobile Development/Intermediate/24 days ago
Two of us are bootstrapping a peer-to-peer tool lending app - borrow a pressure washer from someone three blocks away, with deposits held in escrow. We validated demand through a Facebook-group pilot (400 members, about 60 loans a month coordinated by hand) and now need a real product.
MVP scope: listings with photos, search by distance, a request/approve flow, in-app chat, and deposits via Stripe with manual release. Clickable Figma prototypes exist for every screen. Backend can be Firebase or a thin Node.js API - your call, we will defer to your judgment.
Honest expectations: the budget is tight, the timeline is not. We'd rather you take eight relaxed weeks than five crunchy ones.
FlutterStripe IntegrationNode.js
$2,800.00 - $4,200.00 fixed price0 bids