Blockchain, though known to most people through cryptocurrencies like Bitcoin, is used for much more than powering cryptos. Recently, a lot of companies have been coming up with innovative ways of putting this technology to use, from using it as a decentralized voting system to managing a global shipping system.
Even big companies like IBM and Samsung have adopted it for use. So it's natural that all this interest in it brings about the need for blockchain developers. In fact, according to a report from Upwork, blockchain happens to be the fastest growing skill on its platform, surpassing skills like TensorFlow and machine learning in the top 20 list. This means there are a lot of jobs for blockchain developers.