Mobile App Development · London

Mobile App Development
in London

iOS and Android from one engineer, in your stores in weeks.

We build iOS and Android apps for founders in London — usually React Native, native when the use case requires it. One engineer owns the app, store accounts, and the first build in TestFlight inside three weeks.

Get a Mobile App Development quote London overview

Engagement shape

From

$10,000

Flat price, quoted after 30-min call

Timeline

3–6 weeks to TestFlight

First production deploy

Senior engineer, named

Day 1

Code in your GitHub

Retainer, equity, lock-in

How this works

One AI-native engineer.
The output of a team.

One senior engineer plus AI agents now ships mobile app development that used to need a four-person team. Same code quality, half the cost, three-week timelines instead of three months. Built for pre-seed to Series A founders in London who need to ship before the next round closes.

The local read

Why mobile app development is hard in London

London founders have access to deep fintech and gov-tech talent but the hiring cycle is brutal. Senior offers in the City clear £100K base plus equity that competes with Revolut and Wise. Local dev shops mostly serve enterprise — slow procurement, multi-quarter contracts, agency-of-record billing.

Different model: one senior engineer ships your build in two weeks, four-to-five-hour overlap with our working hours, billed in USD. Open Banking via TrueLayer or GoCardless for fintech. Next.js + NestJS + Postgres for SaaS. Flat-price quote in 24 hours. Code in your GitHub from commit one.

Hiring one senior engineer here is a ~$200K year-one outlay and a 60–90 day search. Our mobile app development engagement starts at $10,000 with a first deploy in 3–6 weeks to TestFlight.

Did you know · London

London is the third-largest tech hub on earth — after the Bay Area and Beijing.

Time zone

--:--:--

GMT

GMT/BST. We overlap with your morning, you ship by your evening. Async workflow built for the gap.

Sectors in London

FintechAIClimate techCryptoB2B SaaS

Stack we use

React Native (Expo)TypeScriptTamagui or NativeWindSupabase / FirebaseSentry

What you actually get

Concrete deliverables.
Live in 3–6 weeks to TestFlight.

No discovery phase that bills for itself. No Figma-only delivery. Every item below is something you can open, click, and ship to a user.

Single codebase for iOS + Android — Expo prebuild for native modules when needed

Authenticated user flow with push notifications and offline-first storage

TestFlight build before week three; App Store + Play Store submission included

OTA updates via Expo Updates so you ship fixes without a store review

App store listings (screenshots, copy, privacy nutrition labels) handled

Why us

Why founders in London pick us for this

Senior engineer who has shipped both stores — store submission isn't a learning experience here

We pick React Native vs native based on the actual feature list, not a default

Performance-aware: list virtualization, image caching, JS-thread budget — measured, not hoped

Push, analytics, crash reporting, deep links, OTA — wired correctly first time

Mobile App Development we've shipped

Founders we shipped mobile app development with

Real founders, real product, real testimonials. The kind of mobile app development work we'd do for you in London.

Affiliate Marketing Platform · 2025

OLSP System

All-in-one affiliate marketing platform with training, traffic tools, and pre-built funnels under a single tracking pixel. Members learn lead generation and earn commissions promoting OLSP's bundled digital products.

Visit the product

Health Platform · 2023

Brain.fm

Music platform designed to help focus, relax, and sleep better. AI-generated music optimized for cognitive performance and mental wellness.

Visit the product

“Working with Start Matter has been a fantastic experience. When we brought Start Matter into the Brain.fm project, we were looking for more than just developers — we needed a team that could think with us, help shape the product, and execute at a high level. Start Matter did exactly that and more. From early iterations to complex feature development, the team showed deep technical expertise, strong problem-solving skills, and a clear focus on delivering value. Communication was always open and honest, and they were great about adapting to changes and challenges without missing a beat. What really stood out was their ability to integrate seamlessly with our internal team and match our pace. They consistently delivered high-quality work and made sure we felt supported at every step. I'm very grateful for their professionalism, creativity, and commitment to excellence. I would highly recommend Start Matter to anyone who wants a reliable, skilled, and thoughtful development partner.”

Daniel Clark

Co-founder, Brain.fm

FinTech App · 2023

getquin

Investment portfolio tracking app with social features for modern investors. Real-time portfolio analytics, dividend tracking, and a community of 500K+ investors sharing insights.

Visit the product

“I had the pleasure of working with Start Matter while building Getquin from the very first idea stage. At the beginning, Getquin was just a concept. Start Matter helped us turn that concept into a real, scalable product. From product discovery and architecture to development and early iterations, the team was deeply involved and consistently proactive. They didn’t just execute tasks, they thought like product partners and helped us make the right technical and strategic decisions early on. What impressed me most was their ability to move fast without sacrificing quality. The foundation they built allowed us to validate the idea quickly, iterate confidently, and ultimately reach a stage where we successfully raised investment. Start Matter played a key role in transforming our idea into an investor-ready product. Their professionalism, technical expertise, and founder-level mindset made a real difference for Getquin's early success. I would strongly recommend Start Matter to founders who are looking to build a product from scratch and need a reliable, experienced team they can truly trust.”

Christian Rokitta

Co-founder, getquin

Deeper reads

Common questions about mobile app development
in London

How fast can you start?

Most builds begin within seven days of the first call. We don't sell discovery — we go from problem statement to first deploy on the same day-one timeline.

Is the price really flat?

Yes. After a 30-minute call we send a single number and a scope you can accept or reject. No hourly billing, no change-order games. If we underestimate, we eat it.

React Native or native (Swift/Kotlin)?

React Native by default — 90% of features are identical and you ship to both stores at once. Native if you have hard requirements (live activities, complex camera, low-level audio, watch app).

Do you handle App Store submission?

Yes — Apple Developer + Google Play account setup (or working in yours), screenshots, privacy declarations, review responses if rejected. Most apps clear review in 24–72 hours.

Who owns the code?

You do, from commit one. The repository is created in your GitHub org. Infrastructure is provisioned in your cloud account. We don't host your stack on ours and we don't lock you in.

More questions → /faq/tech · /faq/timeline · /faq/cost

Got a question about mobile app development in London?

Ask me anything.
Right now.

Real chat. Real answers from our FAQ. If I don't have a clean match, I'll email you back within a day.

Valery Satsura

CEO · Start Matter · usually replies in minutes

Hey, I'm Valery. Ask me anything about working with us from London.

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Mobile App Development elsewhere

We ship mobile app development for founders in

Ready when you are

Ship mobile app development in London
in 3–6 weeks to TestFlight.

30-minute call → flat-price quote in 24 hours → first deploy inside two weeks.

Start the call See London overview

Mobile App Development
in London

One AI-native engineer.
The output of a team.

Why mobile app development is hard in London

Concrete deliverables.
Live in 3–6 weeks to TestFlight.

Why founders in London pick us for this