Smart contract engineer
Posley Company Limited
• www.linkedin.com/company/posley
• Full-time
Jan 2023 - Oct 2024
Hong Kong, Hong Kong SAR
Smart Contract Auditor
Nethermind
• www.linkedin.com/company/nethermind
• Contract
Oct 2022 - Mar 2023
Remote
Lead Blockchain Engineer
RigelProtocol
• www.linkedin.com/company/rigelprotocol
• Full-time
Mar 2021 - Nov 2022
United Kingdom
Head of Engineering Department
Martian Network
• www.linkedin.com/company/martiannetwork
• Contract
Dec 2020 - Mar 2021
Amsterdam, North Holland, Netherlands

I’ve helped secure and scale 12+ DeFi products, deploying production-grade protocols across EVM-compatible chains and Solana. My work spans cross-chain lending systems, leverage vaults, and decentralized on/off-ramp infrastructure — with a focus on liquidity aggregation, cross-border payments, asset management, and real-world asset tokenization. What I Do: Design and deploy secure smart contracts and complex DeFi systems Architect and scale cross-chain infrastructure, integrated with over 10 protocols including Kyber, GMX, Near-Protocol, EigenLayer, and more. Conduct in-depth security research and audits on platforms like Sherlock, Code4rena, and CodeHawks, Cantina. What I've Built: Check out my portfolio — I’ve worked on some exciting projects that are definitely worth your time. Tech Stack: Solidity | Golang | TypeScript | YUL/Assembly | Foundry | Hardhat | Redis | PostgreSQL | Docker | REST APIs. Let’s connect and talk DeFi, cross-chain infra, or smart contract audits. https://onahprosper.github.io/
nethermind.io
rigelprotocol.com
United Kingdom