Dmytro Kovalchuk

I am a blockchain and cryptocurrency developer with over 6 years of experience building decentralized applications, smart contracts, and crypto trading infrastructure. My journey started in 2019 when I wrote my first Solidity contract on Ethereum, and since then I have shipped over 40 crypto projects for clients across DeFi, NFTs, trading, and Web3 infrastructure.

I work exclusively through Upwork where I maintain a 100% job success score and long-term relationships with clients ranging from individual founders to established crypto companies. My approach combines deep technical knowledge with clear communication and a strong focus on security and reliability.

I believe blockchain technology can transform industries by enabling trustless, transparent, and decentralized systems. Whether you need a token contract, a full DeFi protocol, a trading bot, or an NFT collection, I bring the expertise and dedication to deliver production-grade results.

For a deeper dive into cryptocurrency concepts, blockchain fundamentals, and DeFi mechanics, I maintain a comprehensive Cryptocurrency Knowledge Base with guides and resources.

DK

Expertise

Technologies I work with daily

Solidity
Hardhat
Foundry
Web3.js
ethers.js
React
Next.js
Node.js
TypeScript
The Graph
IPFS
Docker
Python
Chainlink
Wagmi
RainbowKit

Experience

Key milestones in my blockchain career

Senior Blockchain Developer

Freelance on Upwork | 2022 — Present

Delivering smart contracts, dApps, trading bots, and DeFi protocols for international clients. Maintaining 100% job success score with repeat engagement rate above 70%.

DeFi Protocol Developer

NovaDeFi Labs | 2021 — 2022

Built yield optimization protocols and staking platforms handling over $5M in TVL. Implemented AMM mechanics, reward distribution systems, and cross-chain bridge integrations.

Smart Contract Developer

PixelArt Collective | 2020 — 2021

Developed NFT smart contracts and minting dApps for multiple collections. Implemented lazy minting, reveal mechanics, and on-chain metadata solutions.

Started in Crypto

2019

Wrote first Solidity smart contract and began contributing to open-source blockchain projects. Built a personal crypto trading bot that sparked my full-time focus on blockchain development.