Matej Bednar

Built 3 React Native apps from scratch. The customer and business apps are live on the App Store and Google Play, and the internal admin dashboard is distributed through TestFlight. I handled the code, payments, deployment and infrastructure, as well as the App Store and Google Play reviews and listings. Tagly: Share and Earn peaked at number 1 in the Lifestyle category on the Czech App Store on 15 August 2026.

Designed the double-entry ledger behind every balance on Tagly. The ledger has 16 transaction kinds, covering deposits, withdrawals, refunds, payments, locks, unlocks, referral bonuses and adjustments. Customers, businesses and the platform each have an available and a reserved balance. Every movement of money is one row that can't be edited, and every row write goes through a single helper.

Set up three environments for the whole Tagly ecosystem: development runs locally, and staging and production run on AWS. The three apps come to nine builds, and all nine install side by side on one phone. Any environment can be tested on a real device without touching production data. Staging and production are fully separated, each with its own database, cache and storage, across 13 AWS services in total.

Built the engine that decides how much a customer is paid for posting about a business. The engine prices each post from 9 factors. Three of the factors:

For Tagly to work, we first had to pass Meta App Review, and passing it requires a full product, so Tagly couldn't ship as an MVP. Tagly also moved real money in both directions, which left no room for error. There's still a lot I decided against building:

Designed the screens of Tagly's three React Native apps. The theme is built for Tagly's core audience, women aged 18 to 35: warm coffee and beige tones, with butter yellow and baby blue accents. All three apps share that palette and one set of components. Below are some of the screens.