Software Engineer II, Core Platform

Reposted Yesterday
Hiring Remotely in United States
Remote
140K-175K Annually
Mid level
Fintech • Payments • Real Estate • Software • Financial Services
Flex splits your rent, and rent-associated costs, into smaller, stress-free payments throughout the month.
The Role
The Software Engineer II will design, implement, and maintain core services like Identity and Payment, ensuring scalability and reliability while automating and improving operations.
Summary Generated by Built In

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 backend engineer to join our core platform team. We want engineers with ideas (because they’ll definitely be heard on our small and tight-knit team) and ambition! Successful devs will feel comfortable in a startup environment and will be happy to work in a remote-first team with a lot of independence.


What you'll do

  • Design, implement and maintain our core service, such as Identity, Auth, Payment, Financial, Risk etc.
  • Scale out core platform to support business growth while maintaining performance and reliability 
  • Continuously improving our daily operations with automation, tooling, design evolution, observability etc.

What We’re Looking For:

  • 2+ years of experience in software development or a related field
  • Strong experience with Java and Python
  • Experience with relational and NoSQL databases, such as MySQL, PostgreSQL, and DynamoDB
  • Proactive working style with strong ownership
  • Experience in the payments domain; familiarity with the payment industry
  • Experience designing and developing fault-tolerant, scalable distributed systems
  • Experience with AWS cloud services, including ECS/EKS, Lambda, API Gateway, VPN, , S3, and RDS
  • Experience with infrastructure as code (e.g., AWS CLI, AWS CDK, Terraform)
  • Strong communication skills, with the ability to explain technical concepts to non-technical audiences
  • Adherence to engineering best practices, with the ability to propose and drive new improvements
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)
$140,000$175,000 USD
Tier 2 (Austin, Washington D.C. Philadelphia, San Diego, Chicago, Atlanta)
$126,000$157,500 USD
Tier 3 (Salt Lake City, all other USA cities)
$119,000$148,750 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

Skills Required

  • 2+ years of experience in software development or a related field
  • Strong experience with Java and Python
  • Experience with relational and NoSQL databases like MySQL, PostgreSQL, and DynamoDB
  • Experience in the payments domain
  • Experience designing fault-tolerant, scalable distributed systems
  • Experience with AWS cloud services like ECS/EKS, Lambda, API Gateway
  • Experience with infrastructure as code (e.g., AWS CLI, AWS CDK, Terraform)
  • Strong communication skills
  • Adherence to engineering best practices

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.

  • 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.
  • 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.
  • 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

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The Company
HQ: New York, NY
419 Employees
Year Founded: 2019

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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