We killed a feature this week that took four months to build. Wrote up what we should have noticed in week two, because the signals were all there.
Stage 1
Find the people worth writing to.
Here is the thing nobody tells you: in the right environment, expanding your network is genuinely easy. In tech, and in plenty of industries like it, most people will give a stranger twenty minutes. They remember being twenty-two. They like talking about their work. Very little is standing between you and a conversation except the message you have not sent.
What it takes is being specific about who. Not “people in tech.” People doing the particular job you are curious about, at the kind of company you are curious about, in a place that is plausible for you.
LinkedIn is the easiest door, and usually the only one you need. Search the role, filter by company or city, and look for the people two or three steps ahead of you rather than twenty. If LinkedIn will not let you message them, their work email is often a guessable pattern, or sitting on a company page. Either channel is fine.