DOSSIER · UPDATED 18 JUN 2026

Flex

Flex is a payment platform for businesses to accept HSA/FSA cards. We offer a prebuilt, hosted checkout page or UI building blocks to integrate HSA/FSA payments directly into your existing flow.

withflex.com ↗Claim this profile
Founded
2023
Headcount
4
Open roles
52
Last raised
Series A · $15M
SECTION I · THE BRIEF

Inside Flex

Brief #76041Updated 18 JUN 2026SAN FRANCISCOY COMBINATORSERIES A
Employbl Dossier

Flex

Flex is a payment platform for businesses to accept HSA/FSA cards. We offer a prebuilt, hosted checkout page or UI building blocks to integrate HSA/FSA payments directly into your existing flow.

Founded
2023
Headcount
4
Open roles
52
Last raised
Series A · $15M
Section II · Premium ProfileMembers only
  • 01Engineering interview process at FlexLocked
  • 02Tech stack & infrastructure choicesLocked
  • 03Culture & day-to-day work styleLocked
  • 04Why join now vs. 6 months from nowLocked
  • 05Hiring focus & open headcount by teamLocked
  • 06Comp philosophy and band contextLocked
Open Flex briefSign in

7-day free trial · $25/mo · cancel anytime

LEADERSHIP

Founders & key people

Sam O'KeefeSam O'Keefe
OPEN ROLES

Hiring at Flex

FUNDING

Capital raised

Total Amount Raised: $18,200,000

Flex's Investors

Flex Funding Rounds

  • Series A

    $15,000,000

  • Seed

    $3,200,000

Funding info provided by Diffbot.
TAGS

Categorized in

Company Collections

These are collections Flex is a part of. Click on the collection name to view similar companies.

Flex's Investors

Flex's Industries

LOCATIONS

Where they work

Flex Headquarters Location

San Francisco, CA, 94115

Loading map…