Founders resist choosing a segment because the Indian market is enormous and narrowing feels like discarding opportunity. The effect is the opposite. A product described for all businesses has to be described generically, which means no particular buyer recognises their own problem in it, which means each sale is a fresh act of persuasion. A product for a specific kind of buyer sells itself partway before anyone speaks.
The criteria for a first segment are practical rather than aspirational. Can you reach them — is there a channel, an association, an event, a person who knows them all. Do they have budget and the authority to spend it without a six-month process. Is the problem urgent enough that they are already spending money or time on it badly. And can you serve them well with what you have, rather than with what you plan to build.
That last criterion eliminates most attractive-looking segments. Large enterprises have budget and are reachable and will require capabilities a young product does not have — single sign-on, audit trails, security review, procurement patience. Choosing them first means spending your first year building compliance infrastructure instead of the product. That may be right; it should be a decision rather than a discovery.
Narrow further than feels comfortable. Not fintech but lending operations at NBFCs under a certain size. Not manufacturing but quality control at auto component suppliers. The narrower the segment, the more precisely you can describe their problem in their words, and the more referrals do your selling — because within a tight segment everyone knows everyone, which is particularly true in Indian industry where sectoral associations and clusters are strong.
Then expand from strength rather than from impatience. The signal that you are ready is not that the segment feels small; it is that you are winning most of the deals you enter, that customers are referring you, and that you can predict which prospects will convert. Expanding before that means carrying an unfinished position into a second market and being mediocre in two places — which is the most common way a promising Indian product company stalls at a few crore of revenue and stays there.