Mobile applications
Cross-platform iOS & Android apps built with React Native and Expo — fast, native-feeling, and ready for the App Store and Google Play.
- iOS & Android
- React Native / Expo
- Store submission
Velfi s.r.o. · Software studio
We design and build mobile & web apps — end to end.
Velfi is a software studio specialising in mobile and web application development — from the first sketch to a published app on the App Store and Google Play.
- iOS + Android
- Native-grade apps
- End to end
- Idea → store
- Contractor
- Work directly with me
Everything your app needs, from one partner.
Velfi builds the product, not just the code. Mobile, web, and the glue in between.
Web applications
Modern, fast web apps and marketing sites with React. Server-rendered or static, accessible, and tuned for performance.
- React & TypeScript
- SSR / static
- Performance-first
End-to-end delivery
One partner from idea to launch: product thinking, UI, development, deployment, and ongoing maintenance — no hand-offs.
- Product & UI
- Backend & APIs
- Maintenance
Apps I've helped bring to life.
A look at products I've built and contributed to as a contractor.
Mobile app contributor
kegg — Lady Technologies
kegg is a fertility-tracking sensor and companion app. I contributed to building the cross-platform mobile application used by women worldwide to track their cycle.
React NativeiOS & AndroidHealth
kegg.techFull product build
Montio
Designed and developed the entire Montio mobile application end to end — from architecture and UI to release. The complete build was delivered solo.
End-to-endMobileSolo build
montio.euA direct, no-hand-off way of working.
You work directly with Pavel Filo — the person designing and writing the code. That means fewer layers, clearer decisions, and an app shipped the way you intended.
- 01
Understand
We start with your goal, users, and constraints — so the build solves the real problem, not a guessed one.
- 02
Design & build
Clean, maintainable code and interfaces that feel right. You see progress early and often, never just at the end.
- 03
Ship & maintain
From store submission to post-launch fixes and improvements — I stay involved after the app goes live.
Contact
Have an app in mind?
Tell me a little about your project and I'll get back to you. Whether it's a fresh idea or an existing app that needs a hand — let's talk.