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I'm a blockchain engineer who loves turning complex ideas into practical, secure software. I specialize in cross-chain DeFi, scalable architectures, and smart contract security. Over the years, I've built and audited protocols, collaborated with product teams, and mentored peers to deliver reliable solutions that users trust.…

John Whitmire

Blockchain Developer, Web Developer, Full Stack Developer, +2

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I'm a blockchain engineer who loves turning complex ideas into practical, secure software. I specialize in cross-chain DeFi, scalable architectures, and smart contract security. Over the years, I've built and audited protocols, collaborated with product teams, and mentored peers to deliver reliable solutions that users trust.…

Available to hire

I’m a blockchain engineer who loves turning complex ideas into practical, secure software. I specialize in cross-chain DeFi, scalable architectures, and smart contract security.

Over the years, I’ve built and audited protocols, collaborated with product teams, and mentored peers to deliver reliable solutions that users trust.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Aragonese

Advanced

Javanese

Advanced

Work Experience

Blockchain Engineer at ThirdWave LLC

September 1, 2025 - September 1, 2025

Designed and developed lending and borrowing protocols with risk isolation and a revenue-sharing model using Solidity, with cross-chain architecture across Ethereum, Arbitrum, Base, and Polygon; achieved a 25% TVL increase within 3 months. Audited and optimized smart contracts using Slither, Foundry, Medusa, and Echidna, improving security and reducing gas usage by 30%. Collaborated with Product and Engineering teams to deliver a feature-rich suite of smart contracts and integrate them into the application stack.

Backend Developer at Hiro

August 1, 2023 - August 1, 2023

Developed and optimized Solana programs in Rust for tokenization projects, adding encryption and digital signatures to secure wallets and on-chain transactions. Built Rust APIs to connect blockchain dApps with high-performance backends, and integrated PostgreSQL and Redis for data management, improving processing speed and reliability by 20%. Optimized automated CI/CD pipelines using Docker, Jenkins, and Azure.

Blockchain Developer at Fractal Wagmi Technologies

May 1, 2022 - May 1, 2022

Developed and launched a Solana-based NFT marketplace using the Anchor framework, generating over $35M in on-chain transactions in the first year. Built secure Rust smart contracts and mentored team members in Solana best practices. Optimized Rust programs for NFT marketplace, achieving a 10% reduction in gas fees, implementing zero‑knowledge proofs, and improving transaction efficiency, scalability, and security across the DeFi ecosystem.

Full Stack Developer at Softeq Development Corp

December 1, 2019 - December 1, 2019

Developed a Web3-integrated B2B SaaS platform using React and Node.js (Express), RESTful APIs, and optimized relational databases with MongoDB and Redis. Streamlined release cycles with CI/CD pipelines using Docker, GitHub Actions, and Terraform on AWS (ECS, S3, RDS), reducing deployment time by 25% while delivering high-performance Web3 applications for SMEs.

Rust Engineer at Parity

August 1, 2023 - August 1, 2023

Designed and implemented performance-critical Substrate runtime modules (pallets) for staking, governance, and treasury logic; contributed to Cumulus parachain integration enabling cross-chain messaging and secure token transfers between parachains and the Polkadot relay chain; wrote unit & fuzz tests and benchmarks to ensure stability and security; collaborated with the core team on networking, consensus, and runtime upgrades to deliver production-ready blockchain infrastructure.

Blockchain Developer at Fractal Wagmi Inc

May 1, 2022 - May 1, 2022

Developed and launched Solana-based NFT marketplace using the Anchor framework; generated over $35M in on-chain transactions in the first year; built secure Rust smart contracts and mentored team in Solana best practices; optimized Rust programs for NFT marketplace reducing gas usage by 10%, implemented zero-knowledge proofs, and improved transaction efficiency, scalability, and security; integrated NFT marketplace with Web2 systems and DeFi protocols to enhance user experience and operations.

Smart Contract Developer at Softeq Development Corp

December 1, 2019 - December 1, 2019

Developed a Web3-integrated B2B SaaS platform using React, with server-side logic in Node.js (Express), RESTful APIs, and optimized relational databases (MongoDB and Redis) to support scalable features. Key results: streamlined release cycles with CI/CD pipelines using Docker, GitHub Action and Terraform on AWS (ECS, S3, RDS), reducing deployment time by 25%, while delivering high-performance Web3 applications for SMEs.