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I am a ward-winning blockchain engineer, researcher, and smart contract security specialist with a proven commitment to building secure, scalable decentralized systems. As a UK Global Talent awardee in blockchain, I bring deep expertise in Solidity, gas optimization, and consensus mechanisms, with a strong track record of securing DeFi protocols.\n\nI have audited over 20 smart contracts, identifying High and Medium vulnerabilities, and I possess deep experience in designing and deploying production-grade smart contracts across EVM-compatible chains and Solana. My focus spans DeFi architecture, derivatives logic, oracles, PoS mechanisms, and upgradeable patterns, and I enjoy collaborating with research and product teams to integrate innovative solutions, including AI-driven consensus experiments.…I am a ward-winning blockchain engineer, researcher, and smart contract security specialist with a proven commitment to building secure, scalable decentralized systems. As a UK Global Talent awardee in blockchain, I bring deep expertise in Solidity, gas optimization, and consensus mechanisms, with a strong track record of securing DeFi protocols.\n\nI have audited over 20 smart contracts, identifying High and Medium vulnerabilities, and I possess deep experience in designing and deploying production-grade smart contracts across EVM-compatible chains and Solana. My focus spans DeFi architecture, derivatives logic, oracles, PoS mechanisms, and upgradeable patterns, and I enjoy collaborating with research and product teams to integrate innovative solutions, including AI-driven consensus experiments.

Prosper Onah

Blockchain Developer, Developer, Programmer, +4

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I am a ward-winning blockchain engineer, researcher, and smart contract security specialist with a proven commitment to building secure, scalable decentralized systems. As a UK Global Talent awardee in blockchain, I bring deep expertise in Solidity, gas optimization, and consensus mechanisms, with a strong track record of securing DeFi protocols.\n\nI have audited over 20 smart contracts, identifying High and Medium vulnerabilities, and I possess deep experience in designing and deploying production-grade smart contracts across EVM-compatible chains and Solana. My focus spans DeFi architecture, derivatives logic, oracles, PoS mechanisms, and upgradeable patterns, and I enjoy collaborating with research and product teams to integrate innovative solutions, including AI-driven consensus experiments.…I am a ward-winning blockchain engineer, researcher, and smart contract security specialist with a proven commitment to building secure, scalable decentralized systems. As a UK Global Talent awardee in blockchain, I bring deep expertise in Solidity, gas optimization, and consensus mechanisms, with a strong track record of securing DeFi protocols.\n\nI have audited over 20 smart contracts, identifying High and Medium vulnerabilities, and I possess deep experience in designing and deploying production-grade smart contracts across EVM-compatible chains and Solana. My focus spans DeFi architecture, derivatives logic, oracles, PoS mechanisms, and upgradeable patterns, and I enjoy collaborating with research and product teams to integrate innovative solutions, including AI-driven consensus experiments.

Available to hire

I am a ward-winning blockchain engineer, researcher, and smart contract security specialist with a proven commitment to building secure, scalable decentralized systems. As a UK Global Talent awardee in blockchain, I bring deep expertise in Solidity, gas optimization, and consensus mechanisms, with a strong track record of securing DeFi protocols.\n\nI have audited over 20 smart contracts, identifying High and Medium vulnerabilities, and I possess deep experience in designing and deploying production-grade smart contracts across EVM-compatible chains and Solana. My focus spans DeFi architecture, derivatives logic, oracles, PoS mechanisms, and upgradeable patterns, and I enjoy collaborating with research and product teams to integrate innovative solutions, including AI-driven consensus experiments.

Skills

Experience Level

Expert

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Language

English

Fluent

Work Experience

Blockchain Software Engineer at paycrest.io

May 1, 2024 - Present

Designed, developed, and maintained core protocol components powering scalable and secure cross-chain payment systems. Pioneered on-ramp implementation through EIP-7702, led automated liquidity aggregation and account abstraction logic, and integrated Near-Intent and Relay for cross-chain intent-based transactions. Contributed backend services in Golang and smart contracts in Solidity focusing on performance and modularity. Developed infrastructure for high-frequency multi-chain liquidity settlements for institutional partners, optimized refunds by 75% through stackup transaction optimization. Followed CI/CD practices using TDD, Go, Foundry, and Hardhat. Enhanced RPC call and microservice performance using Redis and PostgreSQL, delivering testable and production-ready code across EVM and backend services.

Smart Contract Engineer at Posley

November 1, 2024 - August 6, 2025

Led development of Vaultka, a leverage vault system supporting perpetual DEX operations with advanced risk and liquidation logic. Developed Airpuff protocol for leveraging LRTS assets integrating with EigenLayer and restaking primitives. Engineered secure vault strategies with dynamic liquidation, profit-sharing, and asset management. Integrated with GMX, HMX, VELA, KTX Finance, EigenLayer, and other protocols, supporting over $120M in TVL. Built testable smart contracts and orchestrated off-chain logic across Arbitrum, Optimism, zkEVM, and other L2s. Collaborated with multidisciplinary teams to ship fast and secure infrastructure.

Smart Contract Auditor at Nethermind.io

December 1, 2022 - August 6, 2025

Reviewed over 35,000 lines of code across multiple projects, identifying and resolving security vulnerabilities in smart contracts and ensuring robustness of Web3 applications. Collaborated with top-tier teams to deliver secure and high-quality blockchain solutions, contributing to the advancement of blockchain scalability, security, and usability.

Lead Smart Contract Engineer at RigelProtocol Lab

September 1, 2022 - August 6, 2025

Designed and implemented smart contracts for decentralized P2P systems with secure, non-custodial asset transfers and escrow logic. Architected and deployed an NFT marketplace supporting auctions, bidding, royalties, and on-chain metadata using ERC721 and ERC1155 standards. Built gifting dApp supporting one-time and scheduled asset distribution with deterministic addresses and off-chain encrypted metadata. Collaborated with frontend and backend teams for seamless dApp integration. Mentored junior engineers in Solidity, testing workflows, and secure smart contract best practices.

Blockchain Software Engineer at Paycrest

May 1, 2024 - November 11, 2025

Led on-ramp implementation through EIP-7702 and automated liquidity aggregation logic; built Golang-based microservices for a decentralized payment gateway; integrated cross-chain intent-based transactions and account abstraction; contributed to backend services in Golang and Solidity, emphasizing performance and modularity; improved transaction processing with priority queues and RPC-level enhancements, reducing refund rates by 75%.

DAML Lending & Borrowing Prototype at Canton Protocol (Goldman Sachs Evaluation)

December 31, 2023 - December 31, 2023

Designed and implemented a lending and borrowing platform in DAML for the Canton protocol as part of a technical evaluation; translated DeFi primitives from Solidity into DAML templates, adapting to Canton’s privacy and workflow semantics; delivered a working prototype showcasing functional parity with EVM contracts and institutional-grade settlement.

Smart Contract Engineer at Posley

November 30, 2024 - November 30, 2024

Architected and deployed smart contracts managing over $105M+ TVL for a perpetual DEX with leveraged trading and vault-based risk modeling; designed derivative-like yield products with oracle-bounded pricing; developed Airpuff for leveraging LRTS assets with EigenLayer and restaking primitives; built secure vault strategies and integrated with multiple protocols to support over $120M TVL across the ecosystem.

Smart Contract Engineer at Nethermind.io

December 31, 2022 - December 31, 2022

Conducted smart contract audits, reviewing over 35,000 lines of code across multiple projects; identified and resolved a wide range of security vulnerabilities; collaborated with top-tier development teams to deliver secure, high-quality blockchain solutions.

Lead Smart Contract Engineer at RigelProtocol Lab

August 31, 2022 - August 31, 2022

Designed and implemented smart contracts for a Decentralized P2P system, enabling secure, non-custodial asset transfers and escrow logic; architected and deployed an NFT marketplace with auctions, royalties, and on-chain metadata (ERC721/ERC1155); built the Gifting dApp with deterministic addresses and off-chain metadata encryption; mentored junior engineers in Solidity, testing workflows, and secure development practices.