Software Engineer

Flex

158d

About The Position

As one of the earliest engineering hires at Flex, you’ll shape the future of HSA/FSA payments. You’ll work across the stack to deliver seamless customer experiences, build powerful APIs, and design scalable infrastructure that powers our mission. This is a rare opportunity to work directly with leadership, customers, and cross-functional teams to set the foundation for a category-defining company.

Requirements

• 3+ years of engineering experience at tech and product-driven companies.
• Proficient in TypeScript, React, and modern web technologies.
• Skilled in at least one backend language (we use Rust).
• Hands-on experience deploying to AWS infrastructure.
• Comfortable in dynamic, fast-paced startup environments.

Nice To Haves

• Prior startup experience (seed–Series B) strongly preferred.

Responsibilities

• Contribute to building the highest-converting HSA/FSA checkout experience.
• Build simple, elegant APIs that make Flex easy to integrate.
• Design and develop scalable solutions for HSA/FSA payment infrastructure.
• Interact directly with customers to help define the roadmap.
• Work with technologies including Next.js, Rust, TypeScript, Postgres, Redis, and AWS.

Benefits

• Equity compensation with competitive salary.
• Medical, dental, and vision plans.
• Unlimited PTO and sick days.
• Paid parental leave.
• Flexible, remote-first team with quarterly in-person meetups.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level