Field-service SaaS — offline-first iPad app
React Native + Expo + WatermelonDB. Field engineers work in basements with no signal; data syncs the moment they walk outside. 8 weeks from kickoff to first paying customer.
Mobile apps that ship in 4 weeks — and survive their first real user.
React Native + Expo for cross-platform, Swift / Kotlin for native-critical. We build offline-first, OTA-updatable, crash-instrumented apps with a real backend, real auth, and a real App Store submission.
Rate $70 – $90 USD / hour · fixed-fee and retainer available
What you get
- Reference architecture
- a written document with the data model, navigation, state management, and offline strategy.
- Auth & identity
- email/password, magic link, Apple / Google sign-in, MFA, secure token storage (Keychain / Keystore).
- Offline-first sync
- local SQLite / WatermelonDB, conflict resolution, background sync, retry policies.
- OTA updates
- Expo Updates / CodePush, so we can ship a fix without waiting for App Store review.
- Push notifications
- APNs / FCM, deep linking, segmentation.
- App Store submission
- icons, screenshots, listing copy, privacy nutrition labels, signed builds.
How we engage
- 01
Mobile scoping (1 week, fixed fee)
We wireframe the core flows, pick the stack, write a 4-week MVP plan with explicit acceptance.
- 02
MVP build (4–8 weeks)
One named engineer (or two), one named designer (via partner), daily builds, weekly TestFlight / internal track.
- 03
Post-launch retainer
10–20 hours a month for fixes, OTA updates, App Store responses, and feature additions.
Stack we work in
Cross-platform
React Native, Expo, Expo Router
Native iOS
Swift, SwiftUI, UIKit
Native Android
Kotlin, Jetpack Compose, Material 3
State
Zustand, Redux Toolkit, Jotai, Recoil
Local DB
WatermelonDB, SQLite, Realm, MMKV
Auth
Clerk, Auth0, WorkOS, Supabase Auth, custom
Backend
Supabase, Firebase, your existing API
Reference architectures
Anonymized patterns from real engagements. Client names omitted; details available under NDA.
Healthtech — HIPAA-compliant patient app
Native iOS + Android with encrypted local storage, MFA, secure API, and BAA-compliant push. Passed the security review on the first submission.
Consumer startup — 5-day MVP to App Store
Expo + Convex backend. From kickoff to live in the App Store in 5 working days. Featured by Product Hunt that week.
Questions we get asked
React Native or native?
RN/Expo for 80% of apps. Native (Swift + Kotlin) for the 20% that need platform-specific performance (camera, AR, real-time audio, custom hardware). We tell you which one.
Do you do the design?
We partner with a designer firm. You can use your own — we work with Figma exports, no problem.
How do you handle App Store rejections?
We write the privacy nutrition labels, the data-collection declarations, and the listing copy to the latest App Store Review Guidelines. If a rejection happens, we respond same-day with a written appeal.
Do you build the backend too?
Yes — most clients use Supabase, Convex, or Firebase. We also build custom backends in Node / Python / Go if you need more control.
Can you take over an existing app?
Yes. We start with a 1-week code review (no edits), and you get a written report of the technical debt, the security gaps, and a phased remediation plan.
Let’s scope it properly.
A 30-minute call. No deck, no pitch — we read your repo or your architecture diagram and tell you what’s realistic.