Empowering renters with flexible payment solutions
Flex is a mobile application designed to provide renters with flexible payment options for their rent, allowing users to reschedule payments and protect their funds with Overdraft Protection. Headquartered in Midtown Manhattan, New York, Flex has raised $225.1 million in Series B funding and serves ...
Flex offers a range of benefits including unlimited paid time off, 100% company-paid medical, dental, and vision coverage, and a 401(k) plan with comp...
Flex fosters a culture focused on financial empowerment and flexibility for renters, emphasizing the importance of addressing the challenges of monthl...
Flex • Remote (U.S.)
Flex is hiring a Senior Backend Engineer to design, build, and scale backend services and APIs for their innovative rent payment platform. You'll work with technologies like Java and Spring to create robust systems that enhance user experience. This role requires significant backend engineering experience.
You have 5+ years of backend engineering experience building production systems at scale — you've owned services from design through deployment and have navigated complex distributed systems issues. You possess deep expertise in Java and Spring — you've shipped high-throughput APIs that handle millions of requests and have strong opinions on service architecture, dependency injection, and testing strategies. You are comfortable collaborating with cross-functional teams to deliver robust, fault-tolerant systems that impact users at scale. You have experience with API design and system architecture, and you understand the importance of monitoring and incident response in maintaining service reliability. You are proactive in identifying areas for improvement and are committed to elevating your team's performance. You thrive in a fast-paced environment and are excited about the opportunity to contribute to a mission-driven company that empowers renters.
Experience with cloud platforms such as AWS or Azure would be a plus, as would familiarity with microservices architecture. A background in FinTech or similar industries can help you understand the unique challenges of this space.
As a Senior Backend Engineer at Flex, you will play a key role in designing, building, and scaling backend services and APIs that power our products and partner integrations. You will own the end-to-end lifecycle of your services — from requirements and architecture through implementation, testing, deployment, and monitoring. You will collaborate closely with product managers, designers, and other engineers to ensure that the solutions you build meet user needs and business objectives. You will participate in code reviews and provide mentorship to junior engineers, fostering a culture of learning and improvement within the team. You will also be responsible for troubleshooting and resolving production issues, ensuring that our systems remain reliable and performant. Your contributions will directly impact the experience of renters and partners, helping to create a more flexible and accessible rent payment process.
At Flex, we offer competitive medical, dental, and vision benefits available from Day 1, along with company equity and a 401(k) plan with company match starting in 2026. We provide unlimited paid time off plus 13 company-paid holidays, parental leave, and a Flex Cares Program. You will also receive a free Flex subscription, allowing you to experience our product firsthand. We believe in supporting our employees' well-being and work-life balance, and we encourage you to apply even if your experience doesn't match every requirement. Join us in our mission to empower renters and transform the rent payment experience.
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