Flex · 5 hours ago
Senior Software Engineer, Mobile & Web
United States
Full-time
Remote
Mid, Senior Level
$172K/yr - $210K/yr
4+ years expFlex is a growth-stage FinTech company headquartered in NYC, 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 enhance product offerings.
AppsBillingFinancial ServicesFinTechSoftware
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
Expect to be hands-on and execute on work as both an individual, while also building products that allow for flexibility as we are evolving our product offerings
Qualification
Required
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
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
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
Company
Flex
Flex enables people to pay rent bills on a schedule that fits their personal finances.
201-500 employees
H1B Sponsorship
Flex has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
2024 (1)
Funding
Current Stage
Growth StageTotal Funding
unknown2025-03-31Series A
2019-11-01Seed
2019-07-24Pre Seed
Leadership Team
Shragie Lichtenstein
Co-Founder & CEO
Michael Jannain
Staff Software Engineer
Recent News
Flexible Finance, Inc.
2025-10-14
Flexible Finance, Inc.
2025-10-09
2023-12-15
Company data provided by crunchbase