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Staff Software Engineer, Fullstack (Marketing)

Flex

Role overview

Qualifications

  • 7+ years of professional software development experience.
  • 3+ years of hands-on experience with Java.
  • 3+ years of experience with React or React Native.
  • 3+ years of experience with TypeScript.

Responsibilities

  • Focus on creating exceptional user and partner experiences that drive engagement and retention.
  • Partner closely with product managers, designers, data scientists, and data analysts to identify and solve critical user onboarding challenges.
  • Design, develop, test, and deploy robust APIs, services and data pipelines that enhance user onboarding and overall platform experience.
  • Implement changes through an agile methodology, prioritizing rapid iteration and continuous improvement.

Key facts

Hard skills

Java (Programming Language) TypeScript Mobile UI Design React Jsx React Jsx Gradle Containerization Junit Application Programming Interface (API) Application Programming Interface (API) Data Architecture Service-Oriented Architecture Amazon DynamoDB Amazon Aurora Spring AOP Performance Improvement Amazon ElastiCache Data Mining Scalability Service Development AWS Kinesis Microsoft Message Queuing React Jsx Git (Version Control System) Automated Information Systems Datadog Observability A/B Testing High Availability Design Employee Onboarding CI/CD Infrastructure as Code (IaC) Big Data Terraform Cross-Functional Collaboration Data-Driven Decision Making Continuous Improvement Process Iterative Method Agile Software Development

Other skills

  • Mentorship
  • Non-Verbal Communication
  • Teamwork
  • Problem Solving

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

Links

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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?

Flex is looking for a Staff level Engineer to join our dynamic team and play a pivotal role in accelerating our growth trajectory. In this role, you will be instrumental in developing and scaling the platform and app experiences that empower our users and partners, unlocking our next phase of 10x growth.

What You'll Do:

  • Focus on creating exceptional user and partner experiences that drive engagement and retention.
  • Partner closely with product managers, designers, and data scientists, data analysts to identify and solve critical user onboarding challenges.
  • Design, develop, test, and deploy robust APIs, services and data pipelines that enhance user onboarding and overall platform experience.
  • Implement changes through an agile methodology, prioritizing rapid iteration and continuous improvement.
  • Utilize data and analytics to measure the impact of your work and identify opportunities for optimization.

Qualifications

Minimum Qualifications

  • 7+ years of professional software development experience.
  • 3+ years of hands-on experience with Java.
  • 3+ years of experience with React or React Native.
  • 3+ years of experience with TypeScript.
  • Having experience building high-quality mobile and web UIs to specifications is a must to have.
  • 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 architectures and tools in React Native and React ecosystems (Hooks, Components, Context, Redux).
  • Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools.

Preferred Qualifications

  • Have the experience to build and improve user onboarding funnel and design the comprehensive experiment to drive metric improvements.
  • 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.
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 A (NYC/SF/Seattle): $200,000—$250,000 USD
  • Tier B: $180,000—$225,000 USD
  • Tier C: $170,000—$212,000 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.

We offer many employee benefits & perks. For full-time U.S based positions we offer:

  • Competitive medical, dental, and vision available from Day 1
  • Company equity
  • 401(k) plan with company match (our company match kicks off at the beginning of 2026)
  • Unlimited paid time off + 13 company paid holidays
  • Parental leave 
  • Flex Cares Program
  • Free Flex subscription

 For full time non-US employees, we offer

  • Competitive compensation + company equity
  • Unlimited PTO

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MR

Marcus Rivera

Chief Revenue Officer

m.rivera@company.com
linkedin.com/in/marcusrivera
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