Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2025 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team?

About The Role

Flex is looking for a Staff Software Engineer to join our Partner Engineering organization and help build out our payment integrations platform & user experiences.

You will help shape the technical roadmap for the team, working across APIs, SDKs, and Web experiences. You will work with teams across the organization including Engineering, Product, Design, Infrastructure, Sales, Partner and Customer Success to deliver products that wow our customers and drive business goals. We expect you to be hands-on and execute work as an individual, and build products that allow for flexibility as we evolve our product offerings.

Key Qualifications

Skills that are required:

Minimum of 6 years experience in software engineering
Minimum of 4 years experience with Java
Experience leading the delivery of multiple highly impactful products end to end, on time with a high quality bar
Experience working with technical and non-technical stakeholders, successfully aligning and setting expectations on scope and delivery
Ability to drive yourself and your team to bring quality and consistency to their code and architecture, without compromising velocity
Ability to grow in a fast-paced and dynamic environment that will challenge you to always bring your best
Ability to work on a globally-distributed team with a high degree of ownership
Experience working in FinTech and familiar with major payment rails
Proficient in Java frameworks and tools used at Flex, including Spring (core/web/boot), Gradle, JUnit, and JVM (memory/performance tuning, GC).
Experience with Service-Oriented Architecture, REST APIs, Message Queues, and scalable architectures.
Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools.

Preferred qualifications:

Experience working on cross-functional teams involving product, design, and engineering.
Proficient in Java (Spring Boot), TypeScript (React.js/React Native).
Familiar with CI/CD pipelines to improve code stability and quality.
Experience with cloud and containerized environments (Bonus: AWS, Kubernetes, MySQL).
Comfortable working with IDEs such as VSCode, IntelliJ, XCode, and Android Studio.
Motivated to drive team effectiveness and engineering excellence.

_The compensation range for this role will be commensurate with the candidate's experience and Flex's internal leveling guidelines and benchmarks.

For working locations in NY/NJ/CA, the base salary pay range will be $221,000-$237,000
For all other states, the base salary pay range will be $199,000-$213,000

Life at Flex:

We understand that it takes a diverse team of highly intelligent, curious, determined, empathetic, and self aware people to grow a successful company. Our HQ is located in New York City, but we have employees located throughout the US, Australia, Canada and South America. We are growing quickly, but deliberately, with a focus on building an inclusive culture. Our dynamic team has incredible perspectives to share, just as we know you do, and we take great pride in being an equal opportunity workplace.

We offer many employee benefits. For full time, U.S. based employees we offer: