douglassteffany

• Led smart contract projects with a focus on Ethereum, Solana, and EVM-compatible chains like Binance and Avalanche, leveraging Hardhat, Solidity, and Ethers.js to develop upgradeable contracts with robust security, scalability, and performance optimizations. • Designed and implemented NFT and token contracts with enhanced features for decentralized trading platforms, leveraging deep knowledge of blockchain architecture and smart contract security. • Deployed cross-chain smart contracts using Chainlink CCIP to facilitate seamless crypto swaps between Ethereum-based blockchains and Solana, improving interoperability and accessibility for retail users. • Collaborated with multidisciplinary teams, including designers and frontend developers, to create engaging and intuitive dApps with React, TypeScript, and Node.js. • Proficient in GIT workflows (pull request-based), agile tools like Trello and Jira, and delivering highquality, audit-ready code within short sprints.

• Developed and maintained frontend Dapps for Solana and Ethereum networks, utilizing React, Angular, Vue.js, and Next.js. • Deployed and optimized Uniswap V2/V3 contracts and integrated NFT marketplaces, LST, and crosschain functionalities in DeFi projects, ensuring secure and efficient interactions across multiple blockchains. • Collaborated closely with designers and backend developers to deliver user-friendly interfaces, integrating smart contract data with frontend applications using Context API and custom components. • Launched high-performance NFT marketplaces and cross-chain dApps on Ethereum, Solana, focusing on security and scalability. • Built production-ready prototypes, resolved audit issues, and ensured compliance with blockchain best practices during deployment and testing on testnets such as Ethereum Sepolia and Holesky. • Automated deployment scripts for staging and production, reducing downtime in updates.

• Collaborated with backend teams to develop responsive SPAs and 10 mobile applications using React.js, Angular.js, Next.js, and Vue.js, delivering engaging and intuitive user interfaces. • Worked closely with backend developers to integrate APIs and ensure seamless communication between frontend applications and Node.js microservices. • Built and optimized frontend components for applications utilizing AWS API Gateway, improving performance and scalability of API integrations. • Developed dynamic user interfaces and interactive features by consuming REST APIs built on ExpressJS and Fastify, ensuring smooth and responsive user experiences.

• Developed multi-browser compatible web pages using React, Angular.js, Next.js, Vue.js, PHP, and JavaScript, ensuring seamless functionality across different platforms. • Built an internal browser-based text editor leveraging HTML, CSS, JavaScript, Require.js, Backbone.js, Handlebars.js, and Jasmine for enhanced user interaction. • Automated UI testing with JavaScript, Jasmine, and Protractor to ensure the reliability and performance of web applications. • Translated mockups into responsive, high-quality web pages, maintaining consistency with design specifications. • Utilized GIT for version control, following conventional commit standards, and consistently pushed code to GitHub for team collaboration.