jovan

Designed, built, and deployed 12+ production DApps on Ethereum and EVM-compatible networks using Solidity. Architected secure smart contracts with multisig and RBAC patterns and automated on-chain workflows, reducing manual effort by 200+ hours/year and improving process efficiency by 30%. Optimized contract logic and gas usage to reduce transaction costs by up to 25%, saving clients an estimated $50K+ annually. Led cross-functional integrations to deliver 3 major platform upgrades ahead of schedule; implemented monitoring and incident response processes achieving 99.9% uptime and resolving 95% of critical issues within 2 hours. Built comprehensive test and security workflows (Hardhat/Foundry/Truffle) with 90%+ coverage, identifying 15+ critical vulnerabilities pre-deploy. Architected tokenomics and staking mechanisms that increased user participation by 40% and secured $2M+ TVL across Vyntex platforms.

Developed end-to-end SaaS, fintech, and social applications using Node.js, Express.js, React/Redux, and PostgreSQL, delivering scalable and high-performance features. Implemented serverless architectures on AWS (Lambda, API Gateway, IoT Core, RDS, SQS, SNS, EC2), reducing infrastructure costs and improving system reliability. Built RESTful APIs and real-time data pipelines to ensure seamless front-end/back-end integration and improved user engagement. Participated in code reviews, testing, and deployment processes to maintain high code quality, observability, and documentation standards.