Bartosz Wilczynski

Supaslides is a SaaS I built solo, end-to-end. It generates on-brand animated social carousels in under 60 seconds by extracting a brand's identity from its website and using AI to write and design each slide. I handled the full stack: product, front end (React, Next.js, and TypeScript), back end (Node.js and Supabase), infrastructure, and Stripe and AI integrations. It's live and monetized with a freemium model.

Supasplit is a React Native mobile bill-splitting app I built solo, end-to-end. Users scan a receipt or log expenses by voice, and the app itemizes, splits, and tracks balances across 120+ currencies. I handled everything: front end and landing pages (React and React Native), back end (Supabase and Node.js), AI receipt parsing and voice input, and subscription billing. It's live on the App Store with a freemium model.

Beyond Epic is a ski-trip comparison marketplace I built end-to-end as a solo developer. It aggregates packages from Poland's leading tour operators into a searchable platform with daily price and availability updates, allowing travelers to compare resorts, dates, and prices in one place. I handled the full stack, including the front end (Next.js and TypeScript), the back end, an automated data pipeline (Node.js and Supabase), and an SEO content layer. The platform is live for the 2026/27 season.

This is a crowdshipping mobile app published on iOS and Android, with a web admin panel. I've been a lead architect and developer. Our team used React Native for the front end and Node.js with Express for the back end. The application infrastructure was based on AWS services.

This app, created during a 24-hour hackathon and winning first prize, helps people train at the gym. It's based on indoor navigation using beacons and an Android app. It takes the user from one piece of exercise equipment to the next one and even counts the reps.