Senior Software Engineer, Backend, Consumer API

Sorry, this job was removed at 11:10 p.m. (EST) on Tuesday, Jul 30, 2024
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Hiring Remotely in U.S.
Remote
170K-210K Annually
5-7 Years Experience
Fintech • Payments • Real Estate • Software • Financial Services
Flex splits your bills into smaller, stress-free payments throughout the month.
The Role

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?

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.


  • 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


  • 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

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
The Company
New York, NY
230 Employees
Remote Workplace
Year Founded: 2019

What We Do

Flex is an early-stage, remote-first FinTech startup that is bringing flexible payments to recurring bills. Flex is a multi-bill platform. We began by revolutionizing rent — Americans’ largest recurring bill. Flex enables its users to pay rent and bills throughout the month on a schedule that better fits their finances. With Flex, everybody can better manage their bills and budget.

Why Work With Us

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 NYC, but we are remote-friendly with employees located globally (US, Canada, Brazil, and Israel). We value the unique and dynamic perspectives our team brings every day.

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