tomas

Full-Stack Developer

Self-Employed

Feb 2021 - Present • 5 yrs 3 mos

Expert Full-Stack Developer: Blockchain, Web, and App Solutions With 10 years of hands-on experience, I'm a versatile full-stack developer specializing in cutting-edge technologies. My diverse portfolio spans blockchain finance, gaming, decentralized protocols, and modern web/mobile apps, delivering secure, scalable, and innovative solutions for startups and enterprises. Core Expertise Highlighted: * RESTful API Mastery: I design and build high-performance RESTful APIs for seamless integrations. From backend services with JAVA to secure endpoints using JWT, OAuth, and rate limiting, my APIs power efficient data flows in web, mobile, and blockchain apps, ensuring reliability and low latency. CEX Development Experience: I've contributed to centralized exchange (CEX) platforms, including a core scheme that powered the legacy version of Huobi (now HTX). This involved developing trading engines, secure wallets, order matching, KYC/AML compliance, and high-throughput transaction systems for robust crypto trading. * GameFi Innovations: In GameFi, I've created blockchain-integrated games with play-to-earn models, NFT marketplaces, tokenomics, and smart contracts. These projects blend entertainment and finance, featuring scalable economies, fair gameplay mechanics, and cross-chain compatibility for engaging user experiences. DeFi Protocols: My DeFi work includes building decentralized protocols for lending, staking, DEXs, and yield farming. Using Solidity on Ethereum and other chains, I deploy audited smart contracts, oracles, and liquidity pools, focusing on security, interoperability, and user-centric DeFi ecosystems. * PWA and Hybrid Apps: I develop Progressive Web Apps (PWAs) for offline-capable, responsive experiences using frameworks like React and Service Workers. For hybrid apps, I leverage Ionic or React Native to create cross-platform mobile solutions that combine native performance with web flexibility, ideal for e-commerce...... Others