Full-stack Web3 engineer with 7+ years building production-grade blockchain infrastructure and smart contracts.
At Folks Finance I developed Solidity smart contracts for a cross-chain lending protocol securing up to $114M TVL at peak — deployed across 5+ EVM chains using Wormhole GMP and Chainlink CCIP, with contracts going through formal third-party audit and Immunefi bug bounty program.
At Flow Network (4 years) I built and maintained REST/gRPC APIs for Access Nodes — including rate limiting, circuit breakers, and configurable payload handling — and built FCM Observer, a real-time on-chain monitoring service exposing 28 custom Prometheus metrics for the FlowCreditMarket DeFi protocol.
Stack: Go · Solidity · TypeScript · Rust · C++
Protocols: Wormhole · Chainlink CCIP · OpenZeppelin · EVM · Flow
Tools: Foundry/Forge · gRPC · Prometheus · Grafana · Docker
Certified: Encode Club Expert Solidity Bootcamp (on-chain NFT credential, Polygon)
Experience: 5 years
Yearly salary: $110,000
Hourly rate: $60
Nationality: 🇺🇦 Ukraine
Residency: 🇺🇦 Ukraine
Experience
Solidity Developer (Contract)
Folks Finance 2022 - 2025
Developed Solidity smart contracts for a cross-chain lending protocol (hub-and-spoke architecture) securing up to $114M TVL at peak — contracts went through formal third-party audit and Immunefi bug bounty program; participated in audit remediation, reviewing reports and implementing fixes. Implemented cross-chain token transfers and message passing via Wormhole GMP and Chainlink CCIP, handling variable finality and chain-specific RPC inconsistencies across 5+ EVM-compatible chains. Built TypeScript deployment and testing scripts for hub-and-spoke contract rollouts across multiple EVM chains, enabling repeatable end-to-end verification of cross-chain flows. Applied OpenZeppelin security standards throughout; evaluated bridge protocols for attack surface and contributed to pre-audit hardening.
Go Developer — Blockchain Protocol Engineer
Flow Network (Blockchain Partner) 2022 - 2026
Designed and maintained REST and gRPC API endpoints for Flow Access Nodes — including rate limiting, configurable payload caps, and gRPC circuit breakers — supporting reliable data access across mainnet validator infrastructure. Led the protocol-level implementation of immutability for core Flow data structures, improving network security and auditability. Built FCM Observer — a real-time on-chain monitoring service (Go, Prometheus, Grafana) for the FlowCreditMarket DeFi protocol, exposing 28 custom metrics covering position health factors, TVL, reserve balances, and liquidation risk. Maintained >90% test coverage across critical subsystems through comprehensive unit and integration test suites.
Blockchain Engineer
K.R.O.K 2021 - 2022
Developed a Domain Name Service (DNS) smart contract on the Elrond blockchain in Rust. Implemented DeFi vault contracts on Solana (Top-100 CMC protocol) — LP/stablecoin vaults, borrow/liquidation logic, and yield strategies.
Blockchain Engineer
Stakenet.io 2017 - 2021
Contributed to full-cycle development of the XSN native cryptocurrency — consensus layer, chain features, and Lightning Network integration. Built a cross-platform light wallet in Qt Quick and implemented JSON REST API clients for Dash-based network interaction.
Skills
defi
golang
protocol-engineer
smart-contract
solidity