Progsity

Selling programming courses through third-party platforms meant high recurring fees, no control over the exam experience, and hard feature walls: no way to run a real coding playground, no competitive-programming judge, and no unified mobile experience.

The product needed everything those platforms could not offer — secure timed exams, in-browser code execution, automatic grading against test cases, and video delivery — in one system that a small team could operate.

We designed and built Progsity as a single unified platform instead of a patchwork of services. One codebase drives the web app, the instructor tooling and the native mobile apps, so every feature ships to all surfaces at once.

The hardest problems were solved in-house: a sandboxed code-execution service powers both the playground and the judge; the exam engine enforces time limits and integrity controls; and video lessons stream through a CDN-backed pipeline. Payments, analytics and revenue reporting close the loop for instructors.

Progsity is live, growing, and operated by the same team that built it — which means every architectural decision has been tested against real production traffic, real students and real exam sessions.

Zero platform fees, full ownership of the roadmap, and a feature set — judge, playground, proctored exams — that the third-party platforms it replaced still don't offer.