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.

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Founded
2023
Headcount
4
Open roles
55
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
55
Last raised
Series A · $15M
Section II — RestrictedMembers only
  • Engineering interview process at Flex
  • Tech stack & infrastructure choices
  • Culture & day-to-day work style
  • Why join now vs. 6 months from now
  • Hiring focus & open headcount by team
  • Comp philosophy and band context
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LEADERSHIP

Founders & key people

Sam O'KeefeSam O'Keefe
Miguel ToledoMiguel Toledo
OPEN ROLES

Hiring at Flex

Current Job Listings

Listing 0 of 55 job openings
    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

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