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?
As we continue to grow our talented team, we remain committed to radical transparency, integrity, and individual growth. We believe that your unique background and experience adds tremendous value to the organization and will empower you to take absolute ownership of business challenges and the execution of solutions.
What we need:
Flex is looking for a Staff Software Engineer to join our Partner Engineering organization and help build out our payment integrations platform & user experiences. You will help shape the technical roadmap for the team, working across APIs, SDKs, and Web experiences. You will work with teams across the organization including Engineering, Product, Design, Infrastructure, Sales, Partner and Customer Success to deliver products that wow our customers and drive business goals. We expect you to be hands-on and execute work as an individual, and build products that allow for flexibility as we evolve our product offerings.
What you'll do
- Design, implement, and maintain our payment integrations platform, including partner APIs, SDKs, and embedded web experiences
- Help shape and drive the technical roadmap for the Partner Engineering team
- Design and develop scalable APIs and integrations to support money movements across our banking partners via payment rails such as ACH
- Work cross-functionally with Engineering, Product, Design, Infrastructure, Sales, Partner, and Customer Success to deliver high-impact features
- Scale our integrations platform to support business growth while maintaining performance and reliability
- Continuously improve daily operations through automation, tooling, design evolution, and observability
- Mentor engineers and elevate team standards through best practices, code reviews, and technical guidance
What We’re Looking For:
- Minimum 6 years of experience in software engineering
- Minimum 4 years of experience with Java; proficient in Spring (core/web/boot), Gradle, JUnit, and JVM tuning
- Experience with Service-Oriented Architecture, REST APIs, message queues, and scalable distributed systems
- Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization
- Experience leading delivery of multiple high-impact products end to end, on time with a high quality bar
- Ability to work on a globally-distributed team with a high degree of ownership
- Experience aligning technical and non-technical stakeholders on scope and delivery
- Experience in FinTech and familiarity with major payment rails
- Ability to drive quality and consistency across your team without compromising velocity
Nice to Have:
- Proficient in CI/CD systems (preferably GitHub Actions) and automation
- Skilled in observability and monitoring tools such as DataDog
- Experienced with big data platforms including Snowflake
- Proficient in Infrastructure as Code (CDK, Terraform)
- Excellent written and verbal communicator with cross-functional collaboration experience
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.
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
Skills Required
- Minimum 6 years of experience in software engineering
- Minimum 4 years of experience with Java
- Proficient in Spring (core/web/boot)
- Experience with Gradle and JUnit
- Experience with JVM tuning
- Experience with Service-Oriented Architecture, REST APIs, message queues, and scalable distributed systems
- Experience with AWS (EKS, Aurora RDS, ElastiCache, DynamoDB)
- Experience with containerization (Kubernetes/EKS)
- Experience leading delivery of multiple high-impact products end to end
- Ability to work on a globally-distributed team with high ownership
- Experience aligning technical and non-technical stakeholders on scope and delivery
- Experience in FinTech and familiarity with major payment rails (e.g., ACH)
- Proficient in CI/CD systems (preferably GitHub Actions)
- Skilled in observability and monitoring tools such as DataDog
- Experienced with big data platforms including Snowflake
- Proficient in Infrastructure as Code (CDK, Terraform)
- Excellent written and verbal communication with cross-functional collaboration experience
Flex Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Flex and has not been reviewed or approved by Flex.
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Healthcare Strength — Day-1 medical, dental, and vision coverage is explicitly offered and framed as “best-in-class coverage and options,” suggesting strong baseline health benefits. Additional listings also describe broad health-support elements such as IVF/adoption and gender transition benefits, reinforcing depth in healthcare-related coverage.
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Retirement Support — A 401(k) is available, with a stated company match starting in early 2026, indicating improving retirement support. This rollout appears to address earlier gaps where matching was not consistently present.
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Leave & Time Off Breadth — Unlimited PTO plus company holidays (and, in some descriptions, shutdown days) indicates a wide time-off policy on paper. Hybrid work flexibility and office-day meal credits can add to the overall rewards value for NYC-based employees.
Flex Insights
What We Do
Flex, an NYC-headquartered FinTech company, has created a trusted 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! We enable our users to pay rent throughout the month on a schedule that better fits their finances and budget, while also helping them build credit. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense.
Why Work With Us
We believe it takes a diverse team of curious, determined, empathetic, and self aware people to grow a successful company. We value the unique and dynamic perspectives our team brings to solve critical problems that impact the lives of our users and the financial decisions they make.
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