--- title: "Mobile App Development" description: "Ship mobile apps you can maintain. Senior engineers, app-store hardened, full source ownership at handoff. We work in Flutter, React Native, Expo, Swift, or Kotlin, and we pick the right tool for the job. Eight weeks from concept to live." source: "https://www.kensink.com/mobile-app/" canonical: "https://www.kensink.com/mobile-app/" --- ★ Mobile Lab · iOS + Android Lab open · 2 slots Q3 5 stacks · one team Full source at handoff MOBILE APP LAB · EST. 2024 # Ship mobile apps you can maintain. Senior engineers, app-store hardened, full source ownership at handoff. We work in Flutter, React Native, Expo, Swift, or Kotlin, and we pick the right tool for the job, then hand you a codebase your team can extend. Eight weeks from concept to live in the store. [Start your own project →](https://www.kensink.com/contact) [View shipped work →](https://www.kensink.com/cases) Cycle 8 weeks · MVP to store Stack Yours · we pick the right tool Output App + source + runbook Warranty 90 days post-handoff \[WHY KENSINK · 03 PILLARS\] ## Three things hold the mobile lab up. We do three things, and we are honest about what they are. Pick a lab that delivers the one closest to your blocker. P-01 / 03 ### Senior engineers, no junior AI. Every line in your codebase is written by an engineer who has shipped to App Store and Play Store more than once. We don't learn on your project. P-02 / 03 ### App-store hardened. We've been through hundreds of submissions across iOS and Android review. We know what gets rejected, what the screenshots need to say, and how to ship to both stores on the same day. P-03 / 03 ### Maintainable by your team. What we hand off is what your team will extend. Documented architecture, typed surfaces, no clever indirection. The codebase reads like a manual. ★ AGENTHOST · BY KENSINK LABS · LAB PRODUCT ### Your 24/7 developer-AI. Self-service monitoring, triage, and PR drafting. Looking after your apps while humans sleep. Built into every Kensink mobile build. Agenthost watches the production app, takes the easy work off your engineers’ plates, and escalates only the incidents that actually need a human at 3 a.m. [Get early access →](https://www.kensink.com/contact) [Talk to the lab](https://www.kensink.com/contact) WHAT AGENTHOST DOES - 01 24/7 crash + performance monitoring on iOS and Android. - 02 Auto-triage incoming incidents against severity rules you set. - 03 Drafts PRs against your codebase for low-risk fixes. Your engineers review and merge. - 04 Pages humans only when a human is actually needed. No alert fatigue. \[FIVE STACKS · ONE TEAM\] ## Pick the right tool. We’ll bring the team. Every stack below is the right answer for some products and the wrong one for others. We’ve shipped to all five, and that’s how we know when to recommend which. STACK · 01 / 05 Dart Flutter Best for Cross-platform products where design is the differentiator. We ship - One codebase, native-compiled performance on iOS + Android - Riverpod or Bloc state, Dio HTTP, GoRouter navigation - Theming system that mirrors your design tokens 1:1 - Firebase Crashlytics + Sentry for production observability Dart Flutter Firebase Riverpod STACK · 02 / 05 TypeScript React Native Best for Web teams going mobile. Share TypeScript across the stack. We ship - Strict TypeScript, no \`any\` in your handoff - Reanimated 3 for 60fps gesture-driven UI - React Navigation typed routes, deep links, modal stacks - Native module bridge when you need iOS/Android-specific work TypeScript React Native Reanimated Navigation STACK · 03 / 05 TypeScript Expo Best for Fastest MVP iteration. Over-the-air updates without a store review. We ship - Expo SDK 50+ with managed workflow - EAS Build pipeline → both stores in one command - OTA updates for non-native changes, so you ship fixes in hours, not days - Expo Router file-based navigation, typed end-to-end TypeScript Expo EAS Build Expo Router STACK · 04 / 05 iOS native Swift Best for iOS-first markets, premium UX, deep integration with Apple silicon. We ship - SwiftUI + UIKit interop where it makes sense - Swift Concurrency (async/await + actors) for safe data flow - ARKit, HealthKit, Core ML, Vision: Apple frameworks done right - Modular feature architecture: each screen is its own Swift package Swift SwiftUI Combine Core Data STACK · 05 / 05 Android native Kotlin Best for Android-first markets (BD, India, MENA), tight hardware integration, Material You. We ship - Jetpack Compose for declarative UI - Coroutines + Flow for structured concurrency - Hilt for dependency injection at scale - Room persistence with type-safe migrations Kotlin Compose Coroutines Room \[WHAT WE BUILD · FOUR SHAPES\] ## Four shapes of mobile engagement. Every mobile project sits in one of four shapes. The fastest way to scope is to tell us which one you’re in. 01 · MVP · 8 WEEKS ### From idea to App Store in eight weeks. You have a product hypothesis. We have eight weeks. By week 8 you have a real app in real stores with a real install button. Eval suite for the AI pieces if there are any. Best fit: founders raising on traction, not on slides. 02 · CONSUMER · MASS-MARKET ### Consumer apps that survive App Store review. Onboarding flows that activate, push notifications that don't get muted, in-app purchases that don't get rejected, deep links that actually deep-link. We've shipped consumer apps to multi-million-user audiences. Best fit: B2C products where store ratings move revenue. 03 · B2B · FIELD + SALES ### B2B mobile that field teams won't abandon. Field-service apps, sales-enablement, internal operations. Offline-first because warehouses + trucks + customer sites don't have wifi. Sync conflicts handled at the data layer, not in the support queue. Best fit: SaaS extending into mobile-first field workflows. 04 · INTERNAL · EMPLOYEE ### Employee apps that don't need an IT ticket. Side-loaded enterprise builds, MDM-distributed, SSO-integrated. Single sign-on against your IdP (Okta, Azure AD, Google Workspace). Auto-update channel separate from public store releases. Best fit: enterprises with 100+ field employees on company devices. \[PROCESS · EIGHT WEEKS\] ## Four phases, eight weeks, one live app. The eight-week timeline is non-negotiable for MVPs. Bigger engagements run the same shape with more iteration in build. WK 01–02 01 / 04 DISCOVERY ### Product brief, signed off. Two-week scope sprint. Stakeholder interviews, user-research recap, stack decision, scope cuts, eval framework if AI is in the build. Signed brief · cost band · timeline WK 03 02 / 04 DESIGN ### UX flow + design system. Wireframes for the critical-path screens, a design system you own, and clickable prototypes that we test on actual devices before code touches them. Figma file · device-tested prototype WK 04–07 03 / 04 BUILD ### Weekly demos, shipping the whole time. Every Friday a working build lands on TestFlight + internal Android track. We don't build in the dark. You see the app come together week by week. TestFlight + internal-track builds, weekly WK 08 04 / 04 SHIP ### Store submission + handoff. App Store + Play Store submission with the metadata we know works. Full source repo transferred. Architecture runbook + 90-day post-launch warranty included. Live in both stores · source + runbook handed over BY THE NUMBERS ## Apps in stores. Numbers we can show. Updated quarterly across the apps we’ve shipped that publish their numbers. Self-reported by client teams. TO APP STORE + PLAY STORE ACROSS THE LAB'S HISTORY 12 \+ apps shipped to App Store + Play Store across the lab's history. ACROSS THE APPS WE'VE SHIPPED THAT PUBLISH THEIR NUMBERS 4.7 ★ avg rating across the apps we've shipped that publish their numbers. FROM KICKOFF TO INSTALL BUTTON 8 wk · MVP to live from kickoff to install button. Once a quarter we hit 6. EVERY ENGAGEMENT ENDS WITH FULL SOURCE HANDOVER 0 retainers held every engagement ends with full source handover. You own everything. START YOUR OWN PROJECT ## Bring a real product. We’ll bring code on day one. Eight weeks from concept to install button. Source handed over. 90-day warranty after launch. Two slots open this quarter. [Start your own project →](https://www.kensink.com/contact) [Book a 15-min intro](https://www.kensink.com/contact)