Full-Stack Developer
Full-stack developer across React, Node.js and MongoDB, with Flutter on mobile. Ten products delivered in under a year on web, iOS, Android and Windows, from the first commit to the live store listing. Co-founder and active developer of RutaLive, a courier-logistics SaaS in production against Onfleet and Track-POD. Four of the ten run entirely in the browser, with no backend at all.
RutaLive—Link · Bratislava, Slovakia
Multi-tenant courier logistics SaaS competing with Onfleet, Track-POD, and Digital Waybill.
Calorie tracker with an AI assistant: a meal is logged from a sentence, a voice note or a photo, and the week gets a review. Flutter app on its own Fastify and PostgreSQL back end; the diary works offline, and model keys never reach the phone. When a store webhook goes missing, the server asks RevenueCat itself, so a paid renewal is not cut off. On the App Store and Google Play.
Morse translator, straight-key sandbox and Koch-method trainer, entirely client-side. Playback is scheduled against the audio clock, and a keyed press timed from the event rather than the handler — a dot and a dash differ by tens of milliseconds. English and Ukrainian.
PDF editor, converter and form library running entirely in the browser. Edits the text a document already contains — paragraphs are found in its text layer and reopened in its own embedded typeface. 62 conversions, 105 fillable US forms, no server.
Speech transcription on the visitor’s own graphics card through WebGPU, with a WebAssembly fallback; audio never leaves the machine. Caching the weights in IndexedDB took a repeat run of the largest model from 143 s to 12 s.
Print-ready minimalist city-map posters made in a browser tab. Vector tiles are decoded on the client and drawn straight to SVG, so the file survives being scaled to a metre wide. Free, no watermark, no account.
Open-source non-custodial multi-chain wallet (BTC, ETH, SOL, TRX, BNB, LTC, DOGE): QR scan, address book, PIN lock, live market widget. Windows and Android.
Retro Arcade — arcade mini-games with pixel-perfect graphics, retro sound and haptic feedback. Currency Converter+ — offline-first converter with daily rates, five-year charts and 24-hour caching, plus a companion web app. Sudoku — four modes, five difficulty levels, smart pencil marks. All three on Google Play.