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Staff Software Engineer, Mobile & Web

Flex

$199,000 - $262,000
Oct 15, 2025
New York, NY, US • San Francisco, CA, US
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Flex, a FinTech company, is looking to solve the problem of inflexible and expensive rent payment experiences by creating a better user experience across mobile and web platforms.

Requirements

  • A minimum of 4 years experience in React.js or React Native
  • Strong computer science fundamentals
  • Experience with various architectures and tools within the React Native and React ecosystems (Hooks, Components, Context, Redux)
  • Ability to write well-documented and testable TypeScript code
  • Familiarity with REST API’s and tooling across web and mobile architectures
  • Prior experience working on cross functional teams
  • Proficient with TypeScript (Bonus: Native iOS/Android)

Responsibilities

  • Developing, designing, testing, leading projects, and scaling new product offerings that solve complex problems in a simple way for all users
  • Working closely with cross-functional partners across the organization on a daily basis
  • Building products that allow for flexibility as the company evolves its product offerings
  • Leading and delivering products at a large scale without performance bottlenecks
  • Writing maintainable code that uses industry best practices to improve the entire software development life cycle
  • Driving technical vision and setting frontend architecture standards to ensure scalability, performance, and maintainability across multiple products
  • Influencing cross-functional decision-making by partnering with design, product, and backend teams to define technical requirements and balance trade-offs

Other

  • A minimum of 4 years of experience
  • Ability to work closely with other cross-functional partners across the organization
  • Ability to mentor engineers in using best practices for software development
  • Motivated to help other engineers succeed and be effective
  • Competitive pay and benefits package, including 100% company-paid medical, dental, and vision, 401(k) + company equity, and unlimited paid time off