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Performance-oriented smart contract and backend engineer specializing in low-level EVM development, protocol architecture, and Web3 infrastructure. Focused on gas optimization, adversarial testing, and production-grade systems. Founder and lead engineer for non-custodial account abstraction and financial infrastructure, building robust Node.js/MongoDB backends and integrating relayer/paymaster solutions to enable gasless execution and smooth user experiences.…Performance-oriented smart contract and backend engineer specializing in low-level EVM development, protocol architecture, and Web3 infrastructure. Focused on gas optimization, adversarial testing, and production-grade systems. Founder and lead engineer for non-custodial account abstraction and financial infrastructure, building robust Node.js/MongoDB backends and integrating relayer/paymaster solutions to enable gasless execution and smooth user experiences.

Charles Okoronkwuo

Blockchain Developer, Web Developer, Back-End Developer, +3

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Performance-oriented smart contract and backend engineer specializing in low-level EVM development, protocol architecture, and Web3 infrastructure. Focused on gas optimization, adversarial testing, and production-grade systems. Founder and lead engineer for non-custodial account abstraction and financial infrastructure, building robust Node.js/MongoDB backends and integrating relayer/paymaster solutions to enable gasless execution and smooth user experiences.…Performance-oriented smart contract and backend engineer specializing in low-level EVM development, protocol architecture, and Web3 infrastructure. Focused on gas optimization, adversarial testing, and production-grade systems. Founder and lead engineer for non-custodial account abstraction and financial infrastructure, building robust Node.js/MongoDB backends and integrating relayer/paymaster solutions to enable gasless execution and smooth user experiences.

Available to hire

Performance-oriented smart contract and backend engineer specializing in low-level EVM development, protocol architecture, and Web3 infrastructure. Focused on gas optimization, adversarial testing, and production-grade systems.

Founder and lead engineer for non-custodial account abstraction and financial infrastructure, building robust Node.js/MongoDB backends and integrating relayer/paymaster solutions to enable gasless execution and smooth user experiences.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Work Experience

Founder & Lead Protocol/Backend Engineer at SALVA (Salva Nexus)

January 1, 2025 - Present

Designed and deployed core non-custodial account abstraction and financial infrastructure on Base L2. Engineered ERC-4337 account abstraction logic and an on-chain account registry mapping 10-digit account numbers to Safe wallets, plus NGNs (UUPS-upgradeable 6-decimal Naira stablecoin). Built a high-throughput Node.js/Express backend with MongoDB (Mongoose) for indexing on-chain events, managing state (including points/rewards), and serving low-latency user dashboards. Integrated relayer/paymaster infrastructure (e.g., Gelato/Paymaster) and decimal scaling helpers to enable seamless gasless execution and mobile-first transaction UX. Optimized execution/storage flows in Yul/Assembly to reduce gas costs by 40%+ versus standard Solidity.

Smart Contract & Backend Engineer at Independent / Project-Based

January 1, 2025 - Present

Built and maintained end-to-end Web3 infrastructure, ranging from core Solidity smart contracts to Express server middleware, Web3 RPC integration, and production-ready MongoDB schemas. Implemented hardened non-custodial signing/transaction-intent validation to improve safety and phishing resistance. Created custom assembly routines for storage slot calculations and data packing to bypass high-level Solidity overhead. Performed protocol security work through deep-dive adversarial testing, fuzzing/invariant suites, and remediation of liveness/state-machine issues to support 100% fund availability during peak conditions.

Lead Smart Contract Engineer at Independent/Project-Based

January 1, 2025 - Present

Phishing-proof architecture: engineered non-custodial SALVA wallet infrastructure with hardened signing and strict transaction intent validation. Implemented custom multisig validator logic with social recovery; designed a low-level storage and slot-mapping abstraction to reduce gas costs; conducted adversarial testing across governance thresholds; achieved 40%+ gas savings over high-level implementations; led cross-border payment protocol using ERC-4337 and NGN digital asset development.