Formation is a San Francisco–based, A16Z-backed virtual fellowship that trains experienced software engineers to land senior roles at top tech companies. It pairs adaptive AI assessments with one-on-one mentorship from engineers at Meta, Google, Stripe and Airbnb to drill candidates on algorithms, system design and modern AI fluency.
Alex Xu and Sahn Lam are the co-founders of ByteByteGo, the premier technical education platform for system design. Together they built a newsletter with 1M+ subscribers, a YouTube channel with 500K+ subscribers, a GitHub repo with 82K+ stars, and a bestselling book series used by engineers at every major tech company to crack system design interviews. Alex, a CMU grad and former engineer at Twitter, Apple, and Zynga, handles the newsletter, books, and social media. Sahn, a UC Berkeley EECS grad and 25-year veteran of NetApp, Zynga, Ubiquity6, and Discord, leads YouTube content creation. Together they've turned a niche interview-prep subject into a global movement.
Ashish Pratap Singh is an Indian software engineer turned full-time creator who built AlgoMaster - a newsletter, platform, and YouTube channel helping 700,000+ developers crack coding interviews. After stints at Morgan Stanley, Amazon, and Adobe, he quit his SDE-2 role at Amazon US in mid-2024 to return to India and build AlgoMaster.io from scratch. His newsletter grew from zero to 140,000+ subscribers in roughly 12 months, and his GitHub repositories have accumulated 85,000+ stars.