EnglishTech

Project overview

An educational commerce platform with protected course video delivery, student access, and a custom administration system.

My role

Sole Full-Stack Developer

The problem

Paid educational content needs enrollment-aware access and manageable media processing without disrupting legitimate playback.

What I delivered

• Independently built the frontend, backend, administration, course/chapter/lesson management, products, course sales, payments, and student accounts.
• Implemented enrollment authorization, authenticated HLS playback, FFmpeg processing, encrypted media segments, and protected streaming endpoints.
• Built expiring playback sessions, device-aware access controls, and controls against abnormal bulk segment retrieval.
• Developed dynamic user-identifying watermarks with administrator controls for visibility and movement frequency.
• Implemented FTP-backed video storage and administration, playback progress, and resume functionality.

How the system fits together

Engineering challenges

• Coordinating player authorization, session expiry, media storage, and playback progress.
• Deterring bulk retrieval while keeping the player usable for enrolled students.

Technical decisions

• Authorize HLS requests through protected streaming endpoints and expiring playback sessions.
• Combine encrypted delivery with configurable dynamic watermarking and abnormal retrieval monitoring.