AlgoExpert CEO, technical interview platform, 500K YouTube subscribers
Clément Mihailescu
Profile
Clément Mihailescu is proof that you can build a small software empire on top of the one ritual every developer loves to hate: the coding interview. He is the co-founder and CEO of AlgoExpert, the technical-interview-prep platform that grew from a side project into the category leader, with more than 200,000 paying customers. If you have spent any time on YouTube trying to figure out how to pass a FAANG interview, you have almost certainly landed on his channel — 500K+ subscribers deep in mock interviews, salary breakdowns, and blunt career advice delivered in his signature fast-talking, slightly theatrical style.
His origin story is the kind that makes both hope and skepticism reasonable. Mihailescu studied mathematics at the University of Pennsylvania, wrote his first line of code a couple of weeks after graduating, went through Fullstack Academy’s bootcamp, and landed a software engineering job at Google roughly six months later. He spent about two years at Google and a brief two months at Meta (then Facebook) before quitting to run AlgoExpert full-time. He built the company alongside co-founder Antoine Pourchet, an ex-Uber engineer, shipping the product on nights and weekends while working his day job — the classic bootstrapped-founder grind, and one he is happy to narrate in detail.
For developers moving toward AI, the most relevant thread is how Mihailescu has expanded AlgoExpert into a suite: SystemsExpert for system design, FrontendExpert, InfraExpert, iOSExpert, BlockchainExpert, and — most notably for this audience — MLExpert, aimed at machine-learning interview prep. It is a pragmatic, unglamorous read of where the industry is going: as ML roles proliferate, the interview-prep machine follows, packaging distributed-training questions and model-serving trade-offs the same way it once packaged binary trees. He is not a researcher and does not pretend to be; his value is as an operator who reads hiring pipelines accurately and productizes them fast. The company remains bootstrapped, reportedly around $1.9M in annual revenue with a lean team of roughly a dozen people — a deliberately small, profitable business rather than a venture rocket.
What makes Mihailescu worth a developer’s attention is less the LeetCode content and more the model of the one-person-scale creator-founder. He open-sourced his Pathfinding Visualizer and Sorting Visualizer — genuinely useful teaching tools that thousands of learners have cloned. He is polarizing: critics argue his empire monetizes and reinforces a broken, algorithm-trivia hiring culture, while defenders point out he is simply the most honest guide to the game as it actually exists. Both can be true. For someone building a career (or a business) around AI in 2026, he is a useful case study in turning teaching, audience, and a niche pain point into a durable company.
Videos
Controversies
In late 2019, Mihailescu became entangled in a public spat with fellow tech YouTubers Patrick Shyu (“TechLead”) and Jonathan Ma (“Joma”), who registered the lookalike domain algoexpert.com (versus AlgoExpert’s algoexpert.io) and used it to redirect traffic toward their own competing interview-prep product. Accusations flew that Mihailescu had quietly cut affiliate commissions in breach of his own terms — a claim he rebutted publicly with screenshots and emails, and by pointing to terms that reserved AlgoExpert’s right to adjust discounts and affiliate cuts. The dispute was ultimately resolved through lawyers, reportedly with an apology from Shyu and Ma. It was more a creator-economy business feud than a scandal, but it remains the most-cited controversy attached to his name.
Separately, Mihailescu is a lightning rod in the broader debate over whether algorithm-heavy coding interviews measure anything real. As one of the most visible commercial beneficiaries of “grind LeetCode to get hired,” he draws steady criticism that his business incentivizes and legitimizes a hiring ritual many engineers consider broken. He tends to meet that critique head-on rather than dodge it — arguing he is teaching the game that exists, not the one people wish existed.
Spotify Podcasts
YouTube
