tatenda

I write Move on Sui and ship it with tests.SuiLoyalty is an open-source loyalty platform I built as my final year project, awarded 91%. Two Move modules at 86.86% line coverage, with issuance and redemption happening on-chain so a retailer cannot quietly devalue points and a customer cannot forge them — every balance and redemption is independently verifiable. Customers sign in with Google and receive a Sui address derived through zkLogin, so they never handle a wallet or a seed phrase, then scan a QR code at the counter to earn and redeem. Twenty-plus REST endpoints with verified authentication, 31 of 31 tests passing across three CI pipelines. I found and fixed a concurrency defect that let a single-use token redeem twice under simultaneous requests — a failure that produced no error in any log, because each individual operation succeeded. Live at sui-loyalty.vercel.app, source on GitHub.Alongside that I build payment systems that handle real money. Billenta (billenta.com) is an invoicing and payments platform in production use by businesses in Zimbabwe, built and deployed solo: cryptocurrency, card and mobile money checkout across 75 currencies, with national tax integration. Every callback is signature-verified, processed idempotently and replay-protected, so a repeated or forged notification cannot settle a transaction twice. Balances are held as integer minor units, never floating point. First Class BSc (Hons) Computer Science, 84%, De Montfort University. Learning Solidity and Foundry now to work across EVM as well as Move.Looking for junior or entry-level smart contract, protocol or backend work — on-chain assets, loyalty and rewards, payments, or developer tooling. Remote or Dubai.