After a stint on BBC’s The Apprentice, Nick Holzherr set up Air, making HR easy with its ‘Hub & Spoke’ model.

Air’s platform lets companies start with basic software functions and then opt into the features they want, giving them advanced features plus simplicity on the go.

See more of our 101 tech start-up disrupters here. For more trend-setting businesses and their Tech 1sts, head here.

And check out our 101 rising stars of tech - the exciting firms which did not make the main list but have the potential to grow.