2 resources from Stack Overflow Blog we point founders to, and the questions each answers.
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This one is written for engineers, and reading it tells you what your developer will want that a pure product spec does not cover, so you can hand off cleanly and let them fill the technical half. It also reinforces our answer's core point: a good developer examines the problem and asks questions before writing code. Knowing the shape of their document helps you write yours to meet it.
Postman, founded in Bangalore, is a clean example of designing entirely for the individual developer-user first and only later building the enterprise buyer motion once usage had already proven itself. Asthana's own account of 'we just put the product out, and people started buying it' is a useful contrast case to enterprise-sales-first thinking.