Key skills
TypeScriptRustReactNext.jsAWSPostgresRedisLeadership
About this role
Flex is a company focused on simplifying HSA and FSA payments for health and wellness brands. They are seeking a Software Engineer to shape the future of their payment solutions by building APIs and scalable infrastructure while working closely with leadership and cross-functional teams.
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
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
- Prior startup experience (seed–Series B) strongly preferred