Commercial Web Application — Witplex (React, Node.js, MongoDB, JWT) ● Developed and maintained a production full-stack web application. ● Implemented authentication, email verification, password reset, JWT authorization, and role-based access control. ● Integrated Mailgun for transactional emails. ● Implemented avatar upload, editing, and dynamic image resizing. ● Developed responsive interfaces using React, Bootstrap, and Tailwind CSS. ● Used Git and Linux for development and production troubleshooting. ● Used existing Jenkins jobs to deploy changes to the development environment, monitor build logs, and identify deployment errors. Math Minds Game ● Developed Node.js backend APIs and game features. ● Implemented scoring, friends, and search functionality. ● Built the complete mobile web version. ● Supported an application with 2,000+ monthly users. GroGuide ● Built a full-stack application from scratch. ● Implemented authentication and email verification. ● Integrated Stripe payments. ● Developed responsive desktop and mobile interfaces. ● Designed REST APIs and database architecture. MinerBox Platform ● Developed backend features for a cryptocurrency mining management platform. ● Built advertising analytics reports with weekly statistics. ● Implemented crash-log monitoring and filtering tools. ● Integrated third-party APIs for mining pools and coins. ● Worked with real-time mining and market data.