Mowei Learn

Independently completed requirements analysis, database design, front-end and back-end development, and deployment and launch.

A unified “course — chapter — section” content model, so adding a course requires no new pages; learning eligibility is determined centrally on the server (free preview, free courses, class authorization, individual purchase; videos also have availability windows).

Scoring is authoritative on the server: video progress is verified by continuous playback intervals with playback speed capped, and 95% coverage counts as complete; for theory exams, the server draws the questions, keeps time and grades, answers are never sent to the browser, and the exam is submitted automatically on timeout.

Integrated the main site’s unified login (OAuth + PKCE) and product checkout: course purchases with Xinying Coins (platform credits), refund review and scheduled background reconciliation (tested in the production environment); when a result is unknown, only the same order is queried, so there is no duplicate charge.

Learner side and teacher / admin back office: course content tree, question bank, resource cloud drive (chunked direct upload from the browser to object storage, with pause and resume), classes, assignment grading, order refunds, season leaderboards, honors and certificates (downloadable as PDF).

Deployed five services with Docker Compose: API, scheduled jobs, front end, PostgreSQL and Redis; wrote server-side tests and browser tests.