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Staff Software Engineer, Fullstack

Flex

$199,000 - $262,000
Oct 29, 2025
New York, NY, US • San Francisco, CA, US
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Flex is a FinTech company aiming to solve the problem of expensive, inflexible, and difficult rent payments by enabling users to pay rent throughout the month on a schedule that fits their finances and budget.

Requirements

  • 4 +years of experience with Java and 3+ with React/Typescript is required for this position.
  • 6+ years of professional software development experience.
  • 4+ years of hands-on experience with Java.
  • 4+ years of experience with React or React Native.
  • 4+ 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.
  • 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.

Responsibilities

  • Design, implement and maintain our Finance service and internal tooling, including financial reporting, reconciliation/audit process.
  • Design and develop new APIs and functionalities to support large money movements across our banking partners via different payment rails, such ACH.
  • 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.
  • Work closely with product, analytics, finance and engineering peers to launch new financial features into our platform
  • Designing, developing, testing, and scaling systems needed to deliver great user and partner experiences.
  • leading scoping, design and implementation for APIs they build and can drive their production rollouts to completion with minimum oversight.

Other

  • Experience leading the delivery of multiple highly impactful products end to end, on time with a high quality bar
  • Ability to drive yourself and your team to bring quality and consistency to their code and architecture, without compromising velocity
  • Ability to work on a globally-distributed team with a high degree of ownership
  • Experience working with technical and non-technical stakeholders, successfully aligning and setting expectations on scope and delivery
  • Ability to grow in a fast-paced and dynamic environment that will challenge you to always bring your best
  • Experience building robust, fault-tolerant systems with multiple external dependencies
  • Skilled at elevating team standards through best practices, and mentoring junior engineers.
  • Excellent written and verbal communicator, with experience in cross-functional collaboration.