About Loop Guardian

Loop Guardian is the companion platform to Beyond Cracking the Coding Interview, the sequel to the best-selling interview prep classic. We combine a practice platform — 26 technical topics and ~300 curated problems you can write, run, and test solutions against — with a 1:1 coaching program for engineers who want structured, honest guidance to an offer.

What We Stand For

Honesty over hype

We tell you where you actually stand — including when we think coaching is not the right investment for you yet. We would rather lose a sale than waste your time and money.

Practice like it counts

Interviews are a performance skill. Everything we build — problems, mock interviews, sprints — is designed to mirror the bar real companies hold you to.

Results, not seat time

Progress is measured against a goal you set with your coach, not hours logged. Every sprint ends with an honest assessment of whether it moved you closer to an offer.

Respect the effort

Preparing for interviews while working a job is hard. We meet that effort with structure, accountability, and feedback that is specific enough to act on.

The Team

Mike Mroczka

Founder & Coach

Author of Beyond Cracking the Coding Interview. Interview coach who has helped hundreds of engineers land offers at top companies.

The book behind the platform was written by Gayle Laakmann McDowell, Mike Mroczka, Aline Lerner, and Nil Mamano — drawing on insights from over 100,000 real interviews.

Curious what working with us looks like?

We explain the whole program — sprints, what we do, and what we deliberately don’t do.

See How the Program Works