mswafer
Middle Blockchain Developer
Backend and blockchain developer with strong hands-on experience building Solidity smart contracts and Web3 backends for production projects. Worked on multiple NFT marketplaces, SocialFi systems, Telegram Mini Apps, and large-scale Web3 integrations, covering the full lifecycle from smart contract design to backend services and real-time blockchain listeners.
Proficient in Solidity (ERC-20 / 721 / 1155), Hardhat, Ethers.js, and Web3.js, with experience integrating smart contracts into Node.js backends using WebSockets, REST, and GraphQL. Comfortable working with PostgreSQL, Redis, and scalable backend architectures to support high-traffic Web3 applications.
Looking for Solidity and/or Node.js job, fine with both remote work and relocation for full-time work in office.
Looking for Solidity and/or Node.js job, fine with both remote work and relocation for full-time work in office.
Experience: 4 years
Yearly salary: $50,000
Hourly rate: $20
Nationality: 🇺🇦 Ukraine
Residency: 🇭🇺 Hungary
Experience
Backend Developer
$ONCHAIN 2024 - 2024
Took part in building the $ONCHAIN Telegram Mini App with 1M+ active users at the time. Created the foundation of app's backend as well as Farcaster protocol microservices.
Solidity/Backend Developer
Frensly 2023 - 2024
Was the sole solidity and backend developer of the project. Created the audited contract (https://hashex.org/audits/frensly/), integrated it into Express.js + MongoDB backend using WebSocket-based blockchain listener.
Blockchain Engineer
Another Dev 2020 - 2025
Worked as a subcontractor, starting with Web2 jobs and eventually switching over to Web3 ones. Throughout this I've helped to build 15+ NFT collections, 4 NFT marketplaces, multiple staking platforms and several other crypto-related projects.
Skills
blockchain
docker
erc-1155
erc-20
erc-721
ethereum
ethereumjs
git
hardhat
javascript
linux
mongo
nestjs
nft
nginx
node
openzeppelin
redis
solidity
web3js
english
russian
ukrainian