marins1897

Tech: React.js, TypeScript, SCSS, Node.js, Express.js, REST API, GraphQL, Solidity, Docker • Contributing to the development of Puffer’s liquid restaking protocol and DeFi governance products. • Building modular, responsive frontend interfaces with React.js and TypeScript, ensuring high performance and scalability. • Creating and maintaining backend endpoints and GraphQL integrations for seamless data flow between the dApp and blockchain. • Integrating wallet connections, smart contract interactions and staking logic using Solidity and Web3 libraries to deliver a smooth user experience across decentralized systems.

Tech: TypeScript, Node.js, Express.js, REST API, AWS, ECS, RDS, PostgreSQL, Docker • Built the backend of CryptoToday, a community-driven platform for project listings and token-based voting. • Developed REST APIs and PostgreSQL schemas to handle listings, voting logic, and transaction tracking, including deposit and reward flows. • Managed AWS infrastructure, implemented data aggregation and automation through AWS Lambdas, cron jobs and materialized views. • Contributed to blockchain integrations enabling secure token deposits and vote calculation.

Tech: Node.js, TypeScript, GraphQL, PostgreSQL, AWS, Solidity, React.js, Next.js, SCSS • Contributed to the backend and blockchain infrastructure powering ReneVerse Smart Ads – a platform delivering immersive in-game advertising and product placement. • Built GraphQL APIs, microservices and data pipelines using Node.js, TypeScript and PostgreSQL to process ad campaigns and in-game placement data. • Developed scalable serverless solutions on AWS (Lambda, ECS, SQS, SNS, S3, RDS, DynamoDB) to support event-driven workloads and large data streams. • Designed and deployed Solidity smart contracts and blockchain integrations for secure ad verification and on-chain campaign tracking. • Supported frontend integration in React.js and Next.js, ensuring seamless interaction between backend, blockchain and client interfaces.

Tech: React.js, d3.js, React Native, Node.js, Hyperledger Fabric, Golang, Solidity, Docker • Developed frontend features for two enterprise blockchain projects – MediioChain (healthcare data exchange) and eSljedivost (supply-chain traceability for the Croatian government). • Built responsive React.js interfaces with Material UI and d3.js visualizations to display real-time tracking and analytics for users, hospitals and government stakeholders. • Enhanced platform accessibility by developing mobile interfaces and logic with React Native. • Created and integrated backend endpoints using Node.js and REST API to support data synchronization between the UI components and blockchain networks. • Implemented smart-contract logic and chaincode with Golang for Hyperledger Fabric and Solidity contracts on Hyperledger Besu for secure and transparent data management.