React Native apps shipped fast, built to scale.
iOS and Android from a single codebase. MVP development for funded startups — App Store submission, push notifications, auth, and payments.
No commitment. Response within 24 hours. Clients in USA, UK & Australia.
React Native · iOS · Android
✓ App Store & Play Store — 10+ yrs verified
Why Most Mobile App Projects Fail Before They Ship
You Got a Demo, Not a Product
You hired a development shop and 6 months later, you have a demo — not a product. Most mobile app development companies separate design, development, and QA into different teams, different timelines, and different invoices.
The Quote Was Never the Final Price
The quote looked reasonable. Then came the change requests, the platform-specific rewrites, and the maintenance charges. Building native iOS and Android separately doubles your cost — and your headaches.
8 Months of Process. Zero Product.
You're a founder. You need a working MVP in 8 weeks, not a project plan that runs for 8 months. Offshore agencies take your brief, then disappear into a process you can't see or steer.
The App Launched. Nobody Noticed.
You built the app. Nobody downloaded it. Most app making companies stop at launch. Nobody told you about ASO, performance marketing, or what happens after you hit "publish" on the App Store.
Full-Cycle Mobile App Development Services
React Native Cross-Platform Apps
One codebase. iOS and Android. React Native cross-platform mobile app development services that cut your build time by 40% without compromising on performance or user experience.
iOS App Development
Native and React Native iOS app development services — built for App Store approval, smooth performance, and the standards your US and UK users expect from day one.
Android App Development
Android app development built for real-world conditions — fragmented devices, OS versions, and the Google Play standards that separate approved apps from rejected ones.
MVP Development for Startups
Funded startup with a deadline? We build testable MVPs in 6–10 weeks — a working product investors can see and early users can stress-test. Scope-locked. Timeline-committed. No surprises.
App Maintenance & Scaling
Your app shipped. Now what? OS updates, performance optimisation, feature additions, and scaling infrastructure — so your product doesn't decay the moment it's live.
UI/UX Design for Mobile
Design is conversion. Every screen we design follows mobile UX best practices for App Store ratings, session depth, and user retention. Prototypes before a single line of code.
From Idea to App Store. Here's Exactly How We Work.
Discovery & Scoping
We start with a free consultation call to map your idea, your users, and your constraints. Within 48 hours, you get a scope document: features, tech stack, timeline, and fixed price. No surprises.
Build & Iterate
Development starts in week 1. You get a working build every 2 weeks — not a progress report. You test on real devices, give real feedback, and we ship real updates. Our AI-augmented development workflow ships 3× faster than traditional agency timelines.
Launch & Beyond
We handle App Store and Google Play submission, rejection resolution, and launch-day monitoring. Post-launch, we're your ongoing development partner — not a vendor who disappears after the invoice.
Our Mobile App Technology Stack
We default to React Native for most projects — one codebase, 90%+ of native performance, deployed to both App Store and Google Play simultaneously. When a client genuinely needs platform-specific capabilities, we build native. We tell you which before a single line of code is written.
Why Funded Startups Choose BillionX Over Local Agencies
3× Faster Delivery
Our AI-augmented development workflow — Claude Code + a full AI toolchain — means your MVP ships in weeks, not months. We've built production-ready React Native apps in under 8 weeks. Verifiable on request.
Dev + Growth Under One Roof
Most mobile app development agencies hand you an app and leave. BillionX combines development with performance marketing, ASO, and conversion rate optimisation — so your app doesn't just exist, it grows.
You Work With Dushyant Directly
Not account managers. Not offshore sub-teams you never meet. Dushyant leads every project personally — 10+ years on Upwork, 50+ apps shipped. Your brief goes to the person building it.
60% Lower Cost. Same US/UK Standards.
India-based means your budget stretches further without quality compromise. We're Upwork Top Rated with a 10-year verified track record serving clients in the USA, UK, and Australia. The best mobile app development agency in India for Western market standards.
Numbers That Aren't Made Up
App + Ads + CRO. One Sprint. $300K+. 60 Days.
We built the Shopify eCommerce platform, ran Meta Ads, and managed CRO simultaneously — for a single client, in a single sprint. ROAS went from 1.8x to 8x. $300K+ in revenue generated within 60 days of launch. That's what full-funnel delivery looks like.
See Full Case Study →Built for Founders and Growth Teams Who Ship, Not Pitch
Funded Startups
You have a round and a roadmap. You need a mobile app that investors can see in Q1 and users can stress-test in Q2. We build validated MVPs on fixed scopes — no scope creep, no moving goalposts.
Scaling Businesses
Your web product works. Now your customers want mobile. We build the iOS and Android extension of your existing business — connected to your CRM, your auth system, and your backend from day one.
We also build the web backend→Agencies (White Label)
Your client needs a mobile app. You don't have a mobile team. We deliver under your brand — design, development, testing, and launch. You invoice. Your client never needs to know.
See our white-label services→Mobile App Development Questions Answered
A mobile app development agency is a company that designs, builds, and launches mobile applications for iOS, Android, or both platforms. Services typically include UI/UX design, front-end development, backend API integration, App Store submission, and ongoing maintenance. A full-service agency like BillionX Software also handles post-launch growth — including performance marketing and app store optimisation.