Worked on algorithmic trading for cryptocurrency markets, using both centralized and decentralized exchanges on EVM-compatible blockchains. Code base written in Go.

Worked on the universal app using React Native, Expo, and Apollo GraphQL. Occasionally worked with the Clojure back end.

Built a highly dynamic single-page application (SPA) using React.

Worked on various PHP projects and occasionally worked on Android apps using Java.

Worked on the credit card payment processing gateway and its internal tools using PHP and Symfony2.

Worked on the e-commerce platform written in Symfony2.

Developed websites for mobile devices and worked with REST and SOAP APIs. Was responsible for basic Linux server administration (keeping HTTP and FTP servers up and running).

Worked on intranet systems for private schools and several CRUD systems written in frameworkless PHP.

Developed institutional websites for private companies using HTML, CSS, JS, and PHP, occasionally with MySQL databases.