Alex Oppenheimer treats investing like an engineer testing a system, helping founders stress-test how money and value actually flow through their business before they scale, and he even offers paid feedback sessions on his own site with a refund if the conversation isn't useful. When sizing up founders, he looks for people who feel they have no choice but to build their idea, and when evaluating people more broadly he leans on a specific three-part test of character, drive, and luck, alongside pushing people to build a whole network of mentors rather than rely on just one, and he's known for building practical templates and systems that make life easier for the teams he works with.