Backend Engineer • Staff

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 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. Your experience includes mentoring engineers and elevating technical standards — you understand the importance of collaboration across engineering, product, and design teams to ensure the success of projects. You are passionate about creating scalable, reliable, and impactful systems that enhance user experiences and partner integrations. You thrive in a growth-stage environment and are excited about the opportunity to contribute to a mission-driven company that empowers renters with flexibility over their expenses. You are adaptable and eager to take on new challenges as the company evolves.

Desirable

Experience in FinTech or similar industries is a plus — you understand the unique challenges and opportunities in this space. Familiarity with cloud services and microservices architecture would be beneficial — you appreciate the nuances of building systems that are both robust and flexible. A background in mentoring and leading engineering teams is highly valued — you enjoy sharing knowledge and helping others grow in their careers.

What you'll do

As a Staff Software Engineer at Flex, you will play a critical role in setting the technical direction and shaping the long-term architecture of our backend services. You will collaborate with various engineering teams, including Consumer, Partner Integrations, and Core Platform, to ensure that our systems are scalable and reliable. Your hands-on coding and delivery will be essential as you work on impactful projects that power our core business platforms. You will be responsible for mentoring engineers and elevating technical standards across the teams — your leadership will help ensure the success of projects from inception to completion. You will engage with product and design stakeholders to align technical solutions with user needs and business goals. Your contributions will directly impact the user experience and the overall mission of Flex to provide a better rent payment experience.

What we offer

Flex provides competitive medical, dental, and vision benefits from Day 1, along with company equity and a 401(k) plan with a company match starting in 2026. We offer unlimited paid time off and 13 company-paid holidays to support work-life balance. Our Parental Leave program and Flex Cares Program demonstrate our commitment to our employees' well-being. For full-time non-US employees, we offer competitive compensation and equity, along with unlimited PTO. Join us in our mission to empower renters and be part of a team that values innovation and collaboration.