For people starting a company
Thirty minutes on your technical plan.
You are before the product, or before the first engineer joins, and you want someone who has shipped to look at the plan: what to build first, what to buy instead of build, what the first version should and should not do, and what it will honestly take.
Free, no deck needed, no follow-up unless you want one. Come with the problem and who has it. If I can help in half an hour, good. If it turns into something bigger, the cofounder page says how I partner.