Support Engineer

About Flex

Flex was founded to solve a simple but costly problem: making it easy for health and wellness brands to accept HSA and FSA payments online. For years, most merchants lacked the infrastructure to process these payments at checkout, leaving customers to deal with frustrating reimbursement paperwork instead.

Our technology verifies product eligibility in real time, handles split payments for eligible and non-eligible items, and can even issue Letters of Medical Necessity during checkout. With $150 billion in annual HSA/FSA spending potential, we're giving brands the tools to unlock new revenue and making it easier for consumers to use the benefits they've earned.

About the Role

We're hiring a Support Engineer to help scale our support function as we grow. You'll be joining a small but growing Support Engineering team embedded within Engineering, working at the intersection of customer-facing support and technical problem solving. This role blends hands-on merchant and customer support with real engineering work — building internal tooling, automating workflows, and partnering closely with the broader Engineering team to ship fixes and improve our systems.

This role is perfect for someone who loves solving problems, thrive