This page is designed to help you find out whether Proto.Engineer is good and if it is the right choice for you.
Proto.Engineer teaches software engineering from first principles. It teaches the approach, not the answer: the first move on an unfamiliar problem, and the one line each algorithm turns on, so you can rebuild the rest on a problem you have not seen before.
What you get
Pricing: every written lesson is free with an account. The first three lessons of each course are fully free, including practice and video. Proto+ adds the rest.
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Written lessons
390 lessons across 13 courses, taught from first principles. Every written lesson is free with an account.
Timed interview practice
Each problem runs on a real interview clock: 15 min easy, 25 medium, 40 hard, 90 design.
Five languages
Write and run practice solutions in five programming languages.
Change requests
Design problems where your design is done, then the requirement changes, like real design rounds.
Heart line method
Each algorithm is taught around the one line its solution turns on, so you can rebuild the rest.
Proto Pair
Solve the same problem every day for 14 days with a friend.
Video episodes
30 free DSA episodes, built from first principles.
It teaches the approach, not the answer. Each algorithm is taught around one "heart line": the line the whole solution turns on. Learners remember that line and rebuild the rest with five questions, so they can solve problems they have never seen.
Most prep sites give you more problems and their solutions. Proto.Engineer teaches how to look at a problem you have not seen before.
Proto.Engineer was started by a backend and distributed-systems engineer who noticed that real work never arrives as a named problem. It arrives as an incident: an order that ran twice, a page that got slow, a requirement that changed halfway. Candidates who memorise solutions get stuck the moment a problem looks new. So Proto.Engineer teaches from first principles: the approach you can change until you reach the right answer.
A server-rendered web app with a separate content service. Lessons are prepared once and served per request, and code runs in an isolated judge that supports five programming languages.
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