Shirt Squad
Client app · 2024
Brand, design, build, ASO
- React Native
- Figma
Catalogue and collection tracker for 84,000+ football shirts.
ResultAt or near #1 for football shirt searches on both stores.
Onnit Studio · iOS, Android & web apps
Turn your idea into a real app.
I design, build and launch iOS, Android and web apps for founders, small businesses and teams that need an extra developer. You work with me directly from start to finish.
- Status
- Taking on new projects
- Platforms
- iOS, Android & web
- Based in
- Liverpool, UK · remote
Selected work
Combat Connect
Client platform · 2026
Full-stack build
- Next.js
- Supabase
- Stripe
Platform for martial-arts organisations to list their events, so people can browse and find them easily.
ResultLive now.
GreenCart
VeChain · 2025-2026
Contract work
- React Native
- Expo
- TypeScript
Receipt-scanning rewards app. I joined the team to build out the app side, worked to implement a new design, audited the codebase, fixed what needed fixing, redesigned the onboarding and ran ASO across six regions.
Result#1 for “cashback card” in several countries.
Circlo
Linfa · 2026
Contract work
- React Native
- Expo
- TypeScript
Took over an app a previous team had left broken and slow. Went through every problem with the lead developer, fixed them and shipped it.
ResultRunning smoothly in production.
Japanese Whisky Yoru
Client app · 2025
Design, build, launch
- React Native
- Scraper
Portfolio tracker for whisky collectors, with live prices pulled from retailers and a price history for every bottle.
ResultLive on iOS and Android.
Bamos
Client app · 2025
Brand, design, build, launch
- React Native
- Chat
Meet people nearby who share a hobby and are free at the same time.
ResultLive on iOS and Android.
Got an app in mind?
What I do
New apps
iOS, Android or web. I design it in Figma, build it, and get it live. We agree the price before I start, so there are no surprises later.
Existing apps
Slow, buggy or stuck? I go through the code, tell you straight what's wrong, and fix it.
Contract work
Need another React Native developer on the team? I work remotely and I'm flexible on how long for.
How a build works
- 01
Call
A 30-minute chat about your idea. You leave with a plan and a fixed quote, whether we end up working together or not.
- 02
Design & build
You see the designs before anything gets built. Then a few rounds of building and feedback until it feels right.
- 03
Launch
I handle the App Store and Google Play submissions, or put your web app live.
Keep it running. Get it found.
Launch is the start. If you want, I stay on to keep the app healthy and help people find it.
Support plans
Plans start from around £65 a month and cover:
- Hosting and monitoring
- Bug fixes and small improvements
- App Store and Google Play housekeeping
- Keywords, listing copy, screenshots and review replies
What is ASO?
It's SEO for the app stores. The keywords, description, icon and screenshots decide whether your app shows up in search, and whether people tap install when it does.
It works. Shirt Squad sits at or near #1 for football shirt searches, with around 130k Google Play impressions a month. GreenCart is #1 for “cashback card” in several countries, at around 34k a month.
What clients say
Sebastian was responsive, solutions-focused, and genuinely invested in getting the details right. He helped turn a complex idea into a clean, functional app without unnecessary complexity.
Communication is on point and exceeds my expectations with every new feature or update. I couldn’t be happier.
Did more than make my idea come to life, it improved it by injecting genius ways.
Questions
It depends on what the app needs to do. After a short call I give you a fixed price before any work starts. If the budget is tight, a no-code or low-code build can bring the cost down, and I'll tell you if that's the better route.
Most apps take 4 to 8 weeks from kickoff to launch. You get a timeline on the first call.
React Native for iOS and Android, Next.js for the web, and Supabase, Firebase or Node on the backend. You own all the code. For tighter budgets I also build with no-code and low-code tools.
Yes, that's a good chunk of what I do. I start with an audit so you know exactly what's wrong and what it will take to fix, before I change anything.
Yes. Remote, and I'm flexible on how long for. Recent contracts were with VeChain and Linfa.
Bug fixes right after launch are included. After that there are optional monthly plans for updates and App Store Optimisation.
Tell me about your app
I read every message myself and reply within a day.
- Call
- Book 30 minutes
- Sebastian Salata