Flex on LinkedIn · Jul 2026
Flex announced Eugene L. as Head of Engineering; the role covers engineering teams building eligibility, marketplace, and payments infrastructure.
Company research
Public company, workplace, funding, and market signals
Updated Aug 2, 2026
Overview
Flex Technology Co (Flex) is a San Francisco fintech/health-commerce company founded in 2023. It helps health and wellness brands and benefits platforms accept and grow HSA/FSA spending, while also operating a consumer marketplace for eligible products. Flex says its platform has processed 2M+ orders and supports more than 1,000 brands.
Primary product
HSA/FSA payments and commerce infrastructure: hosted or embedded checkout, real-time product eligibility, split-cart payments, Letters of Medical Necessity, recurring-payment support, merchant analytics, and an HSA/FSA marketplace.
Founded
2023
Headquarters
San Francisco, California, United States
Team size
30–40 employees (LinkedIn company data, July 2026); YC previously listed 8 employees.
Work style
Remote
Industry
Financial Services
Sub-industry
Healthcare payments, fintech infrastructure, and health/wellness commerce
Offices
San Francisco, California
Miami, Florida
New York, New York
Distributed workforce across the United States and Canada
Business model
B2B payments infrastructure for merchants
Merchant SaaS/API and e-commerce integrations
HSA/FSA eligibility and compliance services
Consumer HSA/FSA marketplace
Benefits-platform distribution partnerships
Funding
People & investors
Leadership
Co-Founder & CEO
Co-Founder & CTO
Head of Engineering
Head of Compliance
Work & culture
Remote-first and early-stage: high ownership, direct access to founders and customers, small teams, fast execution, and responsibility for building payments, eligibility, compliance, and marketplace infrastructure. Public recruiting materials emphasize a diverse, vibrant team and quarterly in-person meetups.
Work style
Remote
Compensation
Public engineering postings show approximately $150,000–$220,000 annual base salary plus equity, depending on role. Sponsorship is not explicitly stated; postings mention hiring in the U.S., Canada, and Colombia.
Benefits
Medical insurance
Dental insurance
Vision insurance
Unlimited PTO
Unlimited sick days
Paid parental leave
Equity compensation
Quarterly in-person meetups
Product & market
Pricing
Not publicly disclosed. Flex appears to use a merchant/platform commercial model for payment acceptance, integrations, and related services; consumer marketplace pricing is product-specific.
Differentiators
- —Purpose-built HSA/FSA payments infrastructure for e-commerce and wellness rather than general-purpose payments
- —Real-time eligibility determination and compliance support
- —Split payments for eligible and non-eligible items
- —Letters of Medical Necessity during checkout
- —Hosted checkout, APIs, and native e-commerce integrations
- —Merchant analytics, attribution, merchandising, and marketing support
- —Combines merchant infrastructure with a consumer marketplace
- —Supports recurring payments and omnichannel use cases
Technology
Next.js
TypeScript
React
Rust
Node.js
Postgres
Redis
AWS
SQL
Snowflake or BigQuery
PyTorch
Hugging Face Transformers
ML/data pipelines
Customers
Dermstore
iFit
Therabody
Equinox
Ultrahuman
Forme
Kindred Bravely
Chilipad by Sleepme
JOON (benefits-platform partner)
SHOPLINE (platform partner)
RevenueCat (platform partner)
Competitors
Keyrails
Flex's adjacent alternatives include traditional HSA/FSA payment processors, reimbursement workflows, and large retailers such as Amazon and Walmart
Scale & contact
Estimated revenue
Approximately $1.5M–$2M annual revenue (third-party estimate for 2024; not company-reported or audited)
Latest news
GlobeNewswire · May 2026
Flex integrated its HSA/FSA marketplace into JOON's employer benefits platform, extending distribution to employer clients and employees.
Fitt Insider · Feb 2026
Flex announced an Equinox partnership covering HSA/FSA use for selected memberships, training, recovery, and wellness offerings.
Flex blog · Nov 2025
Major partnership announcing HSA/FSA payment acceptance for SHOPLINE’s merchants via Flex.
Flex blog · Nov 2025
Launch of Flex’s HSA/FSA payment support inside RevenueCat-managed iOS, Android, and web subscriptions.
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