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 Job

Flex is looking for a Senior Software Engineer who will be responsible for implementing the various backend systems that support all business features.

In this role, you will be part of the backend engineer team, responsible for the services and integrations that power our products, such as Payment, Billing, Identity, partner integration, etc. You’ll be designing, developing, testing, and scaling systems needed to deliver great user and partner experiences.

You’ll work closely with your product, design and engineering peers to solve our users' most pressing problems around rent payment. You’ll roll out changes to our customers in an agile manner with a delivery cadence that favors small, frequent iterations. The ideal candidate will be comfortable leading scoping, design and implementation for APIs they build and can drive their production rollouts to completion with minimum oversight.

A minimum of 4 years of experience with Java is required for this position.

Minimum Qualifications:

You have strong computer science fundamentals
You have experience to translate the feature requirements into technical specifications.
You have experience leveling up the entire team’s bar by introducing best practices, mentoring junior people, etc.
You have experience with the Java frameworks and tools we use at Flex such as Spring (core/web/boot), Gradle and JUnit
You have experience implementing and operating services in distributed services environments at scale
You have experience with observability and monitoring tools such as DataDog for maintaining high availability
You write high quality code that is testable, maintainable, scalable and secure
You have a good understanding of REST and mobile API best practices
You have great communication skills and are comfortable working with a distributed team

Core Competencies:

Prior experience working on cross-functional teams
Experience with leading the project in its entire lifecycle, from requirements gathering to delivery.
Proficient with Java and Spring (Bonus: AWS, Containers, Kubernetes, MySql)
Experience with CI/CD to improve code stability and code quality

_The salary 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 $197,000-$213,000
For all other states, the base salary pay range will be $177,000-$192,000

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: