vitalikcholan

I've built and contributed to several production applications across Web3, fintech, and real-time data processing domains. At SapientPro, I developed a Web3 gaming marketplace integrating Solana blockchain for CS2, Dota 2, TF2, and Rust, handling item trading and inventory management with NestJS/PostgreSQL backend. I also built a GPS tracking platform with real-time location processing using React and Firebase Firestore. At Insiders, I spearheaded an NFT marketplace where I wrote custom smart contracts in Solidity using HardHat and OpenZeppelin, and led development of an AI-powered mobile app with React Native and NestJS backend. Additionally, I built a video streaming service with adaptive streaming and Redis caching.