According to the Upwork Skills Index, blockchain is the fastest-growing skill out of more than 5,000 per page. Currently, demand far exceeds supply. According to Burning Glass Technologies, in the last 12 months, there were more than 5,743 job openings mostly full-time that required blockchain skills.Is blockchain in demand in 2021. As the DeFi sector heats up, blockchain developers are experiencing an intense demand for their skills - with implications for responsibilities and salaries. If 2020 was a big year for cryptocurrencies, 2021 should be even bigger.