When an app opens in a second, a payment goes through on the first try, or a film starts the moment you press play, you rarely wonder who made sure it would. Often, part of the answer is Datadog, a company most people have never heard of. Its software watches the computers and programs behind such services. It warns engineers when something slows down or breaks, and it helps keep intruders out.
Businesses pay for this by the month or by the year, and many now buy several of its tools at once. Datadog's revenue has grown quickly, and the company collects a great deal of cash. Yet for years it kept almost nothing as reported profit. Lately, that profit has started to rise. Is this a real turn, or only a passing high?
