Back to jobs
New

Software Engineer II, Backend

Remote (U.S.)

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 2025 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 job

Flex is hiring Software Engineer II, Backend roles across three different engineering teams: Consumer, Partner Integrations, and Core Platform. When you apply, you will automatically be considered for all three positions, and your placement will be determined based on your experience and expertise assessed during the interview process.

As a Backend Engineer at Flex, you will be responsible for designing, building, testing, and scaling backend services and APIs that power our consumer products, partner integrations, and core business systems. You’ll work closely with product, design, and engineering peers to solve renters’ most pressing problems and deliver delightful user and partner experiences.

You will own the full lifecycle of your services- from scoping and architecture to deployment and monitoring, and will roll out changes in an agile, iterative manner to deliver impact quickly.

Our Engineering Teams

  • Consumer Engineering: Builds the APIs and backend systems that power Flex’s main consumer-facing products. This team focuses on delivering scalable services that drive a seamless rent payment experience through our mobile and web apps.
  • Partner Engineering: Focuses on our partner integrations platform and partner-facing experiences. This team owns the backend services and external integrations that connect Flex to financial and other third-party partners to ensure reliable, secure rent payment flows.
  • Core Platform Engineering: Builds and maintains the backend systems and infrastructure that support all business features, including Payments, Billing, Identity, and Partner Integrations. This team ensures Flex’s foundation is robust, scalable, and secure.

 

What You'll Do

  • Design, develop, test, and scale backend services and APIs that power Flex’s products, partner experiences, and internal platforms.
  • Implement the service APIs used by our mobile and web apps to simplify complex rent payment processing.
  • Build robust, fault-tolerant systems that integrate with multiple external dependencies and ensure high reliability.
  • Work closely with cross-functional teams—including Engineering, Product, Design, Infrastructure, Sales, Partner, and Customer Success—to deliver features and integrations that wow both customers and partners.
  • Translate feature requirements into well-structured technical specifications and scalable solutions.
  • Lead scoping, design, and implementation for the APIs you build and drive production rollouts with minimal oversight.
  • Contribute to service-oriented architecture, scalable system design, and internal best practices for distributed services environments.
  • Collaborate with peers to evolve Flex’s technical architecture as the company and product offerings grow.
  • Ensure services are observable and highly available through effective use of monitoring tools and practices.
  • Participate in code reviews, CI/CD improvements, and efforts to increase code quality and stability.

 

Key Qualifications

    • Strong computer science fundamentals and passion for building scalable backend systems.
    • 2–3+ years of professional software engineering experience with a focus on backend services.
    • Proficient in Java with hands-on experience using Flex’s core stack: Spring (core/web/boot), Gradle, JUnit.
    • Experience building and maintaining distributed services and APIs at scale in production environments.
    • Familiar with REST API design, mobile API best practices, and service-oriented architectures.
    • Experience building fault-tolerant systems with multiple external dependencies.
    • Skilled in observability and monitoring tools (e.g., DataDog) to ensure high availability.
    • Ability to write high-quality code that is testable, maintainable, scalable, and secure.
    • Demonstrated ability to translate business requirements into technical specifications and deliver high-impact solutions.
    • Excellent communicator who thrives in a collaborative, globally-distributed team environment.
    • Comfortable working with both technical and non-technical stakeholders and setting expectations on scope and delivery.

The salary compensation range for this role will be commensurate with the candidate's experience and Flex's internal leveling guidelines and benchmarks.
  • For working locations in NY/NJ/CA, the base salary pay range will be $179,000-$194,000
  • For all other states, the base salary pay range will be $161,000-$175,000

#LI-Remote

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. For full time, U.S. based employees we offer:

  • Competitive pay
  • 100% company-paid medical, dental, and vision
  • 401(k) + company equity
  • Unlimited paid time off + 13 company paid holidays
  • Parental leave 
  • Flex Cares Program: Non-profit company match + pet adoption coverage
  • Free Flex subscription

 For full time non-US employees, we offer

  • Competitive Pay
  • Company Equity
  • Unlimited PTO

Create a Job Alert

Interested in building your career at Flex? Get future opportunities sent straight to your email.

Apply for this job

*

indicates a required field

Resume/CV*

Accepted file types: pdf, doc, docx, txt, rtf

Cover Letter

Accepted file types: pdf, doc, docx, txt, rtf

Select...
Select...
Select...
Select...

(Select all that apply. This will help us understand your interests but will not determine your final placement.)

Voluntary Self-Identification

For government reporting purposes, we ask candidates to respond to the below self-identification survey. Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiring process or thereafter. Any information that you do provide will be recorded and maintained in a confidential file.

As set forth in Flex’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.

Select...
Select...
Race & Ethnicity Definitions

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection. As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categories is as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.

Select...

Voluntary Self-Identification of Disability

Form CC-305
Page 1 of 1
OMB Control Number 1250-0005
Expires 04/30/2026

Why are you being asked to complete this form?

We are a federal contractor or subcontractor. The law requires us to provide equal employment opportunity to qualified people with disabilities. We have a goal of having at least 7% of our workers as people with disabilities. The law says we must measure our progress towards this goal. To do this, we must ask applicants and employees if they have a disability or have ever had one. People can become disabled, so we need to ask this question at least every five years.

Completing this form is voluntary, and we hope that you will choose to do so. Your answer is confidential. No one who makes hiring decisions will see it. Your decision to complete the form and your answer will not harm you in any way. If you want to learn more about the law or this form, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov/ofccp.

How do you know if you have a disability?

A disability is a condition that substantially limits one or more of your “major life activities.” If you have or have ever had such a condition, you are a person with a disability. Disabilities include, but are not limited to:

  • Alcohol or other substance use disorder (not currently using drugs illegally)
  • Autoimmune disorder, for example, lupus, fibromyalgia, rheumatoid arthritis, HIV/AIDS
  • Blind or low vision
  • Cancer (past or present)
  • Cardiovascular or heart disease
  • Celiac disease
  • Cerebral palsy
  • Deaf or serious difficulty hearing
  • Diabetes
  • Disfigurement, for example, disfigurement caused by burns, wounds, accidents, or congenital disorders
  • Epilepsy or other seizure disorder
  • Gastrointestinal disorders, for example, Crohn's Disease, irritable bowel syndrome
  • Intellectual or developmental disability
  • Mental health conditions, for example, depression, bipolar disorder, anxiety disorder, schizophrenia, PTSD
  • Missing limbs or partially missing limbs
  • Mobility impairment, benefiting from the use of a wheelchair, scooter, walker, leg brace(s) and/or other supports
  • Nervous system condition, for example, migraine headaches, Parkinson’s disease, multiple sclerosis (MS)
  • Neurodivergence, for example, attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder, dyslexia, dyspraxia, other learning disabilities
  • Partial or complete paralysis (any cause)
  • Pulmonary or respiratory conditions, for example, tuberculosis, asthma, emphysema
  • Short stature (dwarfism)
  • Traumatic brain injury
Select...

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.