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Job details

Senior Software Engineer, Backend - Payments

Flex is a growth-stage NYC-based FinTech company revolutionizing rent payments by offering flexible monthly payment schedules. They seek a Senior Software Engineer, Backend specializing in Payments to design, develop, and scale backend systems supporting key business features, delivering seamless user and partner experiences.

Skills

  • Proficiency in Java and Java frameworks like Spring (core/web/boot), Gradle, JUnit.
  • Experience with Service-Oriented Architecture, REST APIs, Message Queues.
  • Working knowledge of AWS services including EKS, Aurora RDS, Elasticache, DynamoDB.
  • Familiarity with containerization tools and performance tuning of JVM.
  • Ability to work with globally-distributed teams and align technical/non-technical stakeholders.

Responsibilities

  • Design, develop, test, and scale backend services related to Payment, Billing, Identity, and partner integrations.
  • Collaborate with product, design, and engineering teams to solve critical user payment challenges.
  • Lead scoping, API design, and implementation, driving production rollouts with minimal oversight.
  • Implement agile delivery with frequent, incremental product iterations.
  • Maintain and optimize fault-tolerant, scalable backend architectures.

Education

  • Bachelor's degree in Computer Science, Engineering, or related technical field preferred.

Benefits

  • Competitive salary based on experience and internal leveling.
  • 100% company-paid medical, dental, and vision for U.S. employees.
  • 401(k) with company equity.
  • Unlimited paid time off plus 13 company-paid holidays.
  • Parental leave and Flex Cares Program with nonprofit matching and pet adoption coverage.
  • Free Flex subscription.
  • Equity grants and unlimited PTO for full-time non-US employees.
To read the complete job description, please click on the ‘Apply’ button
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Average salary estimate

$195000 / YEARLY (est.)
min
max
$177000K
$213000K

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SENIORITY LEVEL REQUIREMENT
TEAM SIZE
SALARY RANGE
$177,000/yr - $213,000/yr
EMPLOYMENT TYPE
Full-time, remote
DATE POSTED
July 23, 2025
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