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Senior Software Engineer, Back End, Consumer Product

USA flag USA


Posted 4 days ago

Job Type

Full Time


$170k - $210k




  • Mission/Vision: Flex aims to revolutionize rent payment lifecycle by offering flexible solutions, making it easier and convenient for renters.

  • Key Responsibilities: Design, develop, test, and scale service APIs for mobile and web apps; collaborate with cross-functional teams; implement high-quality, maintainable code.

  • Growth Opportunities: Leads API projects with ample scope for involvement in production rollouts and mentorship roles, gaining exposure to distributed services and modern monitoring tools.


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 2024 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 Senior Software Engineer that will be responsible for implementing the service APIs that are used by our mobile and web apps.In this role you will be part of the orchestration team, a small team responsible for the app-friendly APIs that provide access to our core platform services. You’ll be designing, developing, testing, and scaling the APIs needed to deliver great user experiences that simplify the complexities of rent payment processing for our customers.

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 5 years experience with Java is required for this position.

Skills that are required:

  • Strong computer science fundamentals

  • Ability to build high quality APIs to specifications

  • Experience with the Java frameworks and tools we use at Flex such as Spring (core/web/boot), Gradle and JUnit

  • Experience implementing and operating services in distributed services environment at scale

  • Experience with observability and monitoring tools such as DataDog for maintaining high availability

  • Ability to write maintainable code that uses industry best practices to improve the entire software development life cycle (unit testing, linting, build automation)

  • Good understanding of REST and mobile API best practices

  • Great communication skills and ability to work with a distributed team

  • Able to mentor engineers in using best practices for software development

Core competencies:

  • Prior experience working on cross functional teams

  • Proficient with Java and Spring (Bonus: AWS, Containers, Kubernetes, MySql)

  • Experience with CI/CD to improve code stability and code quality

  • Experience with IDE’s such as VSCode and IntelliJ

  • Familiar with the Java ecosystem

  • Motivated to help other engineers succeed and be effective

The national pay range for this role is $170,000-$210,000 annually. Individual compensation will be commensurate with the candidate's experience aligned with Flex's internal leveling guidelines and benchmarks.

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, 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:

  • Competitive pay

  • 100% company-paid medical, dental, and vision

  • 401(k) + company stock options

  • Unlimited paid time off with a PTO minimum + 13 company paid holidays

  • Parental leave

  • Flex Cares Program: Non-profit company match + pet adoption coverage

  • Free Flex subscription


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Healthcare benefits

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401(k) Match

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Stock Options

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Paid Leave

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Parental leave