Nikola J.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Apr 7, 2026.

I'm a Blockchain Engineer with 5+ years of experience, capable of writing smart contracts, building backend and developing frontend. I'm an expert in writing smart contracts in Solidity/Rust/Move and web3 integration, and building backend in Node.js, Python, Rust and Go. I'm also experienced in developing frontend in React.js/Next.js with Tailwind CSS. I've built nearly all kinds of dApps including DeFi, DEX, NFT market place, P2E games on EVM-compatible chains, Solana, Stellar, Aptos/Sui and even Cosmos chains. I've expertise in building custom chains by forking Cosmos SDK or Evmos, with blockscout/big dipper forked block explorer.