Erin Abrams can remember a time when her employer, Via Transportation Inc., was excited to hit 500 rides in a day. Now, the New York-based transit-on-demand service has provided more than 30 million rides around the world. The service is similar to those of Uber Technologies Inc. or Lyft Inc., but puts more of a focus on commuters and shared rides.

Abrams has been general counsel for the startup for nearly four years. Her day-to-day experience leading a department of three lawyers and one paralegal at Via is much different than it was during the close to two years she spent working in-house as senior vice president and senior compliance officer in the control group of Citibank.