Mark M.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I am a Senior React/JavaScript and Web3/DeFi Developer with over 10 years of experience specializing in Web3, DeFi, and blockchain technologies. I excel in creating scalable front-end applications with seamless API integrations and rich-data user interfaces. My recent projects include developing dynamic applications for finance and cryptocurrency platforms, showcasing my ability to tackle complex transaction flows and dashboards. I have hands-on experience with Ethers.js and DApp development, ensuring your blockchain-based solutions are efficient and effective. I am currently seeking 1-3 month projects and am open to contract-to-hire opportunities or emergency-fix engagements. If you need a skilled developer who can transform your ideas into impactful solutions, let's connect. Together, we can build the future of finance and decentralized applications.