Three fintech companies—Stavvy, Greenlight Financial Technology, Inc. and Nium Inc.—announced legal head appointments Thursday as each aims to accelerate growth.

The hirings come amid a boom in fintech sector, which is challenging the business models of established companies in tradition-bound financial services industry. Fintech funding in 2021 more than doubled from the prior year and accounted for $1 of every $5 in venture funding, according to CB Insights.