A collection of fintech platforms, blockchain solutions, and web applications I've built over the years.
Fintech Platform
A gift-card-and-crypto fintech platform serving 350K+ users. Hired on Fiverr to work on a Laravel monolith, I became the lead developer and rebuilt it single-handed into 16 NestJS microservices — with crypto rails, a mobile app, and a double-entry ledger on live money.
Crypto Exchange
A centralized crypto exchange built for a client through Mithium: spot trading on a high-performance Go matching engine, 20+ blockchains, and multi-cloud Kubernetes over a WireGuard mesh. P2P and margin trading are under development.
MPC/TSS Wallet
A multi-chain wallet secured by MPC/TSS threshold signatures. Keys are generated and used as distributed shares, so no single party ever holds the full private key.
Mobile App
The React Native (Expo) mobile app for the GCBuying fintech platform — gift cards, crypto trading, wallets, and bill payments on one cross-platform codebase, with 100K+ downloads, riding on the platform's GraphQL microservices backend.
Self-custodial crypto wallet with multi-chain support, Uniswap V3 swaps, and WalletConnect integration.
DeFi / DEX Aggregator
Combines 1inch aggregation with Uniswap V3 pools to find optimal trading routes.
P2P Escrow
A P2P trading platform spanning five blockchains, with smart-contract escrow for trustless settlement and real-time transaction monitoring. Built for a client through Mithium in 2023.
NFT Marketplace
An ERC-998 composable NFT marketplace for genomic research data, with fractional ownership, IPFS storage, and subgraph-powered search.