Backend Engineer • Senior

Who you are

You have 5+ years of backend engineering experience building production systems at scale — you've owned services from design through deployment and have navigated the complexities of distributed systems. Your expertise in Java and Spring is deep, allowing you to design high-throughput APIs that handle significant user loads while maintaining performance and reliability. You understand the importance of RESTful services and have experience in creating and consuming APIs that integrate seamlessly with various platforms.

You thrive in collaborative environments, working closely with cross-functional teams to deliver robust solutions that meet user needs. Your problem-solving skills are top-notch, and you enjoy tackling challenges that arise during the development lifecycle. You are also familiar with best practices in testing and deployment, ensuring that the systems you build are not only functional but also maintainable and scalable.

What you'll do

As a Senior Backend Engineer at Flex, you will play a pivotal role in designing and building backend services that power our innovative rent payment solutions. You will collaborate with product managers, designers, and other engineers to define requirements and translate them into technical specifications. Your responsibilities will include owning the end-to-end lifecycle of your services — from architecture and implementation to testing, deployment, and monitoring.

You will be instrumental in developing APIs that facilitate seamless interactions between our platform and our users, ensuring that the experience is both intuitive and efficient. Your work will directly impact renters and partners, providing them with the flexibility they need in managing their rental payments. You will also contribute to the team's growth by mentoring junior engineers and sharing your knowledge of best practices in backend development.

What we offer

At Flex, we provide a competitive benefits package that includes medical, dental, and vision coverage from Day 1, along with company equity and a 401(k) plan with a company match starting in 2026. We believe in work-life balance, offering unlimited paid time off and 13 company-paid holidays. Our culture emphasizes support and flexibility, ensuring that our team members can thrive both personally and professionally. Join us in our mission to empower renters with the flexibility they deserve.