Web3 engineer since 2018 — smart contracts, backends and frontends for DeFi. I take a product from Solidity through NestJS to the UI and ship it as one system. This is where I open-source stuff and break things.
What I've built
- Liquorice — DeFi lending + intent settlement for market makers (~$1M/day). Wrote the protocol core (interest-rate model, liquidations, Chainlink Functions oracle, EIP-712 settlement), audited by MixBytes & Pessimistic, live on Ethereum / Arbitrum / Base. Built the market-maker dashboard on top (Next.js, FSD).
- zRexFinance (co-founder) — leverage protocol, up to 10x via Aave / Uniswap / Compound on 3 EVM chains. Sole author of
core-contracts: account factory, custom account abstraction, flashloan → swap → deposit routing. - Tornado Cash core team @PepperSec (2020–2022) — ZK privacy protocol, peak ~$1B TVL. Wrote
tornado-relayerv1 & v2 from scratch,tornado-subgraph,contributor totornado-cli, helped rewritetornado-novacontracts; moved ZK-proof generation into Web Workers (~5 min → ~30 s). - multisender.app / nft.multisender.app — bulk token / NFT distribution, ~$800M lifetime volume, 40+ EVM chains. Assembly-optimized contracts; founded the NFT version.
- NFTxCards (co-founder) — NFT marketplace on Ethereum + BSC: orderbook, 10k ERC-721, Chainlink VRF loot boxes.
- Earlier:
swaponline/MultiCurrencyWallet— in-browser atomic swaps BTC ⇄ ETH (#4 contributor, ~900 commits).
Stack
Solidity · Foundry · Hardhat · OpenZeppelin · Chainlink · The Graph · TypeScript · Node.js / NestJS · PostgreSQL · Redis · React / Next.js · Feature-Sliced Design · wagmi / viem · Storybook · Cypress · Docker · CI/CD · Claude Code / Codex
Also
- Led and hired engineering teams of 3–10; I like teaching people and growing them to senior.
- 📫 Telegram @zick0x · X @0xZick · puffingcheeks@gmail.com
- ⚡ Fun fact: I ❤️ 🐶s