Artur Grzesiak

A full-fledged virtual classroom for teaching and learning foreign languages.

• Architected, developed, and designed a virtual language lab consisting of a server and four user-facing applications for teachers, students, admins, and super-admin.

• Used low-level WebRTC with audio and video communication via Jitsi Videobridge.

• Created sophisticated audio recording where users overwrite, merge with an underlying audio file, and record remote streams.

• Supported dynamic audio routing; divided students into groups; and users can speak with selected students.

• Implemented a custom, browser‐based file manager for audio, video, text, and HTML class assets.

• Enabled a remote‐control feature of students' recorders and assets with the option to collect their work.

• Implemented dozens of other features like exam support, displaying external content, screen sharing, raising hands, and quizzes.

• Deployed the product successfully in multiple US-based schools.

A portal for players and coaches. A player uploads a video for a coach to receive personalized feedback and a performance review.

The heart of the product is the video editor, which offers basic drawing, adding audio/mic input, and changing the playback rate of the video (including a complete freeze). All modifications are presented on a zoomable timeline.

I rank in the top 2% overall on StackOverflow. I have been most active in answering JavaScript-related questions, with my recent years' focus on TypeScript. I specifically enjoy answering non-trivial questions, specifically those with a bounty attached.

A tool for recording and playback, including real-time broadcasting interactions with HTML5 sites and apps done purely in JavaScript.

Previously, you could watch videos of users using web apps, but it was not a proper video. I made changes to the DOM recorded and played it back.

I made a custom proxy with long-term asset caching.