- Led the complete refactor of https://console.upstash.com/, migrating from Next.js 12 to 14 and implementing react-query caching, which cut down loading times by approximately 50% and significantly enhanced user experience.- Led maintenance of popular SDKs including @upstash/redis, @upstash/vector, and @upstash/qstash, collectively achieving over 600,000 weekly downloads.- Developed RAG (Retrieval-Augmented Generation) SDK from scratch to enable powerful AI application development.- Mentored and trained 4 junior engineers, accelerating their productivity within a couple of months.

- Initiated and led the start of a startup project, setting the foundation for future development.- Designed and implemented a cache-dependent system using Redis to address session constraints from booking providers. This improved data access speeds and overall system efficiency.- Successfully migrated long-running requests to AWS, using S3 and SQS, a strategictransformation that not only solved the critical issue of Next.js 60-sec timeouts but alsounlocked the potential to handle an array of long requests. Resulting in a $75K revenueincrease that month.

- Led the maintenance and optimization of legacy projects, resulting in a noticeable improvement in overall system efficiency.- Led the transition of a major project to a Micro Frontends architecture.- Mentored and trained colleagues, fostering a team environment of continuous learning and improvement.- Created an internal tool to monitor npm version changes across all Micro Frontend applications, allowing for immediate detection of out-of-sync issues. This proactive approach significantly enhanced Developer Experience (DX) and prevented numerous versioning problems, thereby streamlining the development process.

- Client-side development of new ATMs- Developing new features and re-implementing old ones with React Hooks- Improving the performance of React codebase

Developed a custom CLI to automate the process of transferring static texts from websites to mobile apps, eliminating manual copy-pasting. This significantly improved efficiency, saving several days per project.

Maintenance and development of operating B2B and B2C systems written in .Net and .Net Core. Writing API's for external users, converted existing monoliths into microservices and played a big role in brand new B2C eCommerce written in React and .Net Core. Also, all the SEO adjustments handled by me.

Worked on a greenfield project that was an association management system for association's with numerous clients, using .NET and Javascript. I also worked on the accounting platform for the project that was programmed in Javascript.