Logo for Flex

Senior Software Engineer, Backend FinPlatform

Role overview

Qualifications

  • Minimum of 6 years experience in software engineering
  • Minimum of 4 years experience with Java
  • Experience building robust, fault-tolerant systems with multiple external dependencies
  • Proficient in Java frameworks and tools used at Flex, including Spring, Gradle, JUnit, and JVM.

Responsibilities

  • Implement various backend systems that support business features
  • Design, develop, test, and scale systems to deliver great user and partner experiences
  • Work closely with product, design, and engineering peers to solve user problems
  • Lead scoping, design, and implementation for APIs and drive production rollouts.

About the company

Flex logo

Flex

Buy Now Pay Later (BNPL) & Consumer Credit

Flex is a simple app that’s changing the way the world pays and collects rent. Our technology makes the 1st of the month easy for renters and properties. For renters, we pay the rent on the 1st and let you pay it back when it works better for your budget. We help you buy some time (or whatever else you’re eyeing). For properties, we help you collect more and stress less. And we do the previously impossible by turning rent collection into a marketable amenity. WHAT WE STAND FOR •We believe you should be able to choose when you pay your bills. The flexibility of buy-now-pay-later has forever changed the way the world makes purchases. We believe the same flexibility should be available for one of life’s #1 expenses: rent. •We believe in the win-win. We like helping people keep commitments. With our technology, properties get the rent and renters get the time. The future is flexible. •We believe in the end of rent regret. Sharing human spaces used to be easier. But then payment came into the picture and rent regret was born. The worst part of rent regret is that it separates us from each other. We’re committed to solving rent regret forever.

Company details

Company typeScaleup
IndustryBuy Now Pay Later (BNPL) & Consumer Credit
Company size201 - 500

Your match analysis

See how your profile stacks up against this role.

We compared the job requirements to your profile to show where you're strong and where you fall short.

Job description

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 2026 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 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

  • Minimum of 6 years experience in software engineering
  • Minimum of 4 years experience with Java
  • Ability to work on a globally-distributed team with a high degree of ownership
  • Experience working with technical and non-technical stakeholders, successfully aligning and setting expectations on scope and delivery
  • Ability to grow in a fast-paced and dynamic environment that will challenge you to always bring your best
  • Experience building robust, fault-tolerant systems with multiple external dependencies
  • Experience designing, building, and maintaining data pipelines
  • 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

  • Proficient in CI/CD systems (preferably GitHub Actions), git, and automation.
  • Skilled in observability and monitoring tools, such as DataDog, to ensure high availability.
  • Experienced with big data platforms and tooling, including Snowflake.
  • Proficient in Infrastructure as Code, using tools like CDK and Terraform.
  • Skilled at elevating team standards through best practices, and mentoring junior engineers.
  • Excellent written and verbal communicator, with experience in cross-functional collaboration.

Compensation

Flex takes a market-based approach to pay, and compensation may vary depending on your primary work location. Work locations are categorized into one of three tiers based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be commensurate with their experience, qualifications, and Flex’s internal leveling guidelines and benchmarks.

Tier 1 (NYC/Bay Area, Los Angeles, Seattle)
$172,000$215,000 USD
Tier 2 (Austin, Washington D.C. Philadelphia, San Diego, Chicago, Atlanta)
$154,800$193,500 USD
Tier 3 (Salt Lake City, all other USA cities)
$146,200$182,750 USD

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.

Offices

Roles posted in New York, San Francisco, and Salt Lake City are hybrid positions with on-site expectations of 2-3 days per week in our local offices. For candidates outside of these areas, you may be eligible for our relocation assistance program.

Benefits

For full-time U.S. employees we offer:

  • Competitive medical, dental, and vision
  • Company equity
  • 401(k) plan with company match 
  • Unlimited paid time off + 13 company paid holidays
  • Parental leave 
  • Free Flex subscription

 For full-time non-U.S. employees, we offer:

  • Competitive compensation + company equity
  • Unlimited PTO

Apply once. Then go straight to the hiring manager.

After you apply, unlock the direct contact details of the people who actually make the call. A quick follow-up makes you 5x more likely to land an interview.

MR

Marcus Rivera

Chief Revenue Officer

m.rivera@company.com
linkedin.com/in/marcusrivera
Unlocked after you apply
·

Software Engineer Related jobs

Other jobs at Flex

Premium

Reach out to the hiring manager directly.

Gain access to the contact details of the hiring managers who actually decide, and reach out to network with them directly. That, plus more when you upgrade:

  • Full match report with fit score and gaps
  • Career diagnostics on how recruiters read you
  • Curated company matches and warm intros
  • 48h early access to new roles

Cancel anytime.