A profile of payment card services startup Marqeta, which according to a source has doubled its revenue every year since 2016, reaching close to $150M in 2018 (Jeff Kauflin/Forbes)

Jeff Kauflin / Forbes:
A profile of payment card services startup Marqeta, which according to a source has doubled its revenue every year since 2016, reaching close to $150M in 2018  —  n the spring of 2015, Jason Gardner, the founder of Marqeta, a payments processor, left a grim board meeting and went for a walk …