A hyperscaler is a cloud provider able to operate infrastructure at very large scale, in datacenters spread across several continents. The term mainly refers to AWS (Amazon), Google Cloud and Microsoft Azure.
These players offer hundreds of services: compute, storage, databases, networking, AI, security. Their size lets them add capacity very quickly and provide a global offering, which few players can do. They are also among the main providers of rented GPUs for AI.
In Europe, the word often comes up in the sovereignty debate: the three main hyperscalers are American and therefore subject to US law, including the Cloud Act. This pushes some sensitive organizations toward sovereign cloud offerings or hybrid partnerships.
Why it matters when hiring
The AWS, Google Cloud and Azure ecosystems are similar in principle but differ in the details (services, tooling, security). A strong engineer can move from one to another, but needs time to be just as effective. If your stack runs on a specific provider, ask for hands-on experience with that one; otherwise, favor an understanding of fundamentals (networking, identity, costs) over a list of services.