Senior Mobile App Developer
Build, stabilize, or scale mobile software with senior engineering across iOS, Android, React Native, SwiftUI, Kotlin, Unity/C#, Firebase, backend APIs, BLE, WatchOS, AI features, App Store and Google Play releases, and product architecture.
A mobile app is rarely just screens. It usually includes authentication, backend data, permissions, notifications, payments, media, analytics, admin workflows, app store releases, and long-term maintenance. This page is for buyers who need a senior developer involved directly in those decisions and in the implementation.
Build a focused first version for iOS, Android, React Native, or Unity with clear scope and a realistic release path.
Replace a fragile, abandoned, or unfinished app with a cleaner implementation and better technical foundation.
Fix crashes, state bugs, performance issues, Firebase problems, technical debt, and release blockers.
Use Firebase Auth, Firestore, Storage, Cloud Functions, push notifications, security rules, analytics, and admin workflows with better structure.
Add AI workflows, summaries, search, assistants, or automation features inside real mobile products.
Support TestFlight, App Store release, crash fixes, user feedback, and post-launch feature work.
Delivered a SwiftUI/Firebase social app for creators with AVKit/Nuke media handling, GIF previews, curated feeds, push notifications, Cloud Functions, BigQuery analytics, and a React dashboard.
View ProofStabilized and shipped a cross-platform iOS/Android AR app experience built with Unity and AR Foundation for NASA's STEM program.
View ProofDelivered React Native/Expo, SwiftUI, Kotlin, Flutter, BLE, WatchOS/HealthKit, and native share-extension work across field-service, science, fitness, hardware, and media apps.
Handled updates and rescue work for apps including Cellf Defense, Stupid Simple Macro Tracker, SmoothSpeak, WaterSprout, Pickleball Match, and other client codebases.
Portfolio includes Eureka Canvas, Planet XR, ModaVision, CRAFT, Soul and Form, WeatherSats AR, and other published or TestFlight-distributed mobile projects.
View ProofBuild native iOS apps with SwiftUI, UIKit, Combine, StoreKit, AVKit, MapKit, WatchKit, HealthKit, Vision, App Store readiness, and maintainable structure.
Use React Native, Expo, TypeScript, Kotlin, Flutter, or Unity when it fits the product, and avoid cross-platform shortcuts when native control matters more.
Connect mobile features to Firebase, custom APIs, storage, authentication, notifications, dashboards, and operational systems.
Review existing mobile codebases and find the shortest practical path to a stable app, release, or rebuild.
The right answer depends on features, budget, timeline, team, performance needs, and long-term maintenance.
Yes. The usual first step is a codebase, backend, architecture, and release-process review.
Yes. Mobile work often includes Firebase, Node.js APIs, storage, notifications, admin tools, and data modeling.
Native iOS consulting for SwiftUI apps, Firebase systems, and App Store launches.
View ServiceCross-platform consulting for React Native apps, MVPs, and rescue projects.
View ServiceAI feature integration for mobile apps, workflows, internal tools, and backend systems.
View ServiceContact me about an iOS app, Android app, React Native app, Firebase-backed MVP, AI mobile feature, app rebuild, or technical rescue project.
Contact Me About Your Mobile App
Verified reviews from real projects
“Amazing in communication.”
Client · iOS App (Swift & Firebase)
“Went above and beyond.”
Client · Firebase Integration Revamp
“It was great working with Bill! Very pleasant and knowledgeable.”
Client · Language Learning App