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Senior Software Engineer, Mobile & Web

Flex

$177,000 - $213,000
Sep 24, 2025
New York, NY, US • San Francisco, CA, US
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Flex is a growth-stage 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

  • A minimum of 4 years experience in React.js or React Native is required for this position.
  • Strong computer science fundamentals
  • A strong focus on building high quality mobile and web UIs to specifications
  • Experience with various architectures and tools within the React Native and React ecosystems (Hooks, Components, Context, Redux).
  • Experience leading and delivering products at a large scale without performance bottlenecks (hundreds of thousands to millions of users)
  • Ability to write well-documented and testable TypeScript code
  • Familiarity with REST API’s and tooling across web and mobile architectures

Responsibilities

  • development of our core user experience across our mobile and web platforms
  • launch new features across our web and mobile platforms
  • developing, designing, testing, and scaling new product offerings
  • execute on work as both an individual, while also building products that allow for flexibility as we are evolving our product offerings
  • Write maintainable code that uses industry best practices to improve the entire software development life cycle (unit testing, linting, automation)
  • Collaborating with engineers across multiple teams to improve code quality
  • Able to mentor engineers in using best practices for software development

Other

  • working closely as part of a team
  • working closely with other cross functional partners across our organization on a daily basis
  • Our team works in an agile manner
  • Prior experience working on cross functional teams
  • Motivated to help other engineers succeed and be effective