During my time at the company, with average monthly user base of 35,000 unique users, I developed a notification system, a daily reward feature, and a giveaway system with dynamic logic and real-time updates to boost user engagement. I also implemented a modal system to improve the user interface and integrated a payment solution using Telegram Stars for in-app monetization. I also refactored key parts of the codebase to TypeScript, enhancing maintainability, performance, and consistency. Additionally, I optimized the application, improved the Vite configuration, and contributed to faster builds and a more scalable, developer-friendly codebase.