Top companies don't usually look for knowledge on concrete technologies or programming languages. They usually give more importance to your attitude and your capacity to learn, be autonomous, and face new challenges.
As an example, I joined New Relic (a top company in monitoring systems) to be a Go language systems programmer, while I had been always Java Backend engineer. There is an accepted period of adaptation to new technologies and languages.
You need also to consider that top companies are always adopting state of the art technologies, and there is always a first time to adopt such new tech and tools. If a novel DB system raises, nobody expects that the senior architect that adopts is has previous experience.