Senior Software Engineer, Mobile & Web at Flex in Remote

Summary: Flex is a growth-stage FinTech company headquartered in NYC that is focused on creating the best rent payment experience. They are seeking a Senior Software Engineer to develop their core user experience across mobile and web platforms, working closely with cross-functional teams to launch new features and improve product offerings. Responsibilities: - Responsible for the development of our core user experience across our mobile and web platforms - Working closely as part of a team to launch new features across our web and mobile platforms - Developing, designing, testing, and scaling new product offerings that solve complex problems in a simple way for all of our users - Working closely with other cross functional partners across our organization on a daily basis - Executing on work as both an individual, while also building products that allow for flexibility as we are evolving our product offerings Required Qualifications: - 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) - Write maintainable code that uses industry best practices to improve the entire software development life cycle (unit testing, linting, automation) - Ability to write well-documented and testable TypeScript code - Familiarity with REST API's and tooling across web and mobile architectures - Collaborating with engineers across multiple teams to improve code quality - Able to mentor engineers in using best practices for software development Preferred Qualifications: - Prior experience working on cross functional teams - Proficient with TypeScript (Bonus: Native iOS/Android) - Experience with CI/CD to improve code stability and code quality - Experience with IDE's such as VSCode & Android Studio & XCode - Familiar with Android / iOS / Web development tool ecosystem - Motivated to help other engineers succeed and be effective Required Skills: React.js, React Native, TypeScript Important Skills: REST APIs, CI/CD Nice-to-Have Skills: Agile methodology, Code quality improvement Benefits: Competitive medical, dental, and vision available from Day 1, Company equity, 401(k) plan with company match (our company match kicks off at the beginning of 2026), Unlimited paid time off + 13 company paid holidays, Parental leave, Flex Cares Program, Free Flex subscription