Sr. Software Engineer, Frontend

Prosper•San Francisco, CA

1d•Hybrid

About The Position

As a Senior Frontend Engineer on the Personal Loans team, you will own the borrower-facing experiences that drive Prosper's core business -- from rate check through funding. Using modern web and mobile technologies, you will build and maintain the applications that guide borrowers through one of the most important financial decisions they'll make. Your work will directly impact conversion, borrower satisfaction, and Prosper's top-line growth. We are investing heavily in AI across our engineering organization -- from AI-assisted development workflows to intelligent borrower experiences. You'll be joining a team that actively embraces AI tools to accelerate delivery, improve code quality, and explore new ways to make the borrower journey smarter and more personalized.

Requirements

BS in EE/CS with 8+ years of experience or MS in EE/CS or other applicable disciplines with 6+ years of experience
Deep proficiency in React , React Native , and TypeScript , with the versatility to move seamlessly between web and mobile platforms.
Hands-on experience with GraphQL (Apollo) and RESTful APIs to power high-performance applications.
Familiarity with monorepos (pnpm, Turborepo), bundlers (Vite), and CI/CD pipelines to maintain a high-velocity development environment.
Disciplined approach to automated testing using tools like Jest, Playwright, or Detox to ensure systems are meticulous and trustworthy.
Active use of AI coding assistants (Cursor, Copilot) and a commitment to exploring new AI developments to enhance team productivity and solve product problems.
A sharp eye for UX/UI polish, ensuring high-stakes financial flows feel intuitive, professional, and reliable.
A proactive, high-accountability approach to driving projects to completion and unblocking yourself to deliver outcomes, not just outputs.
A deep focus on the "borrower behind the screen," sweating the details to maintain trust in a domain where financial accuracy is paramount.
Excellence in cross-functional communication and a dedication to elevating the team through clear mentorship and knowledge sharing.

Nice To Haves

Experience with Expo and mobile deployment workflows (App Store, Google Play).
Familiarity with cross-platform styling systems (Tamagui, styled-components).
Background in fintech, lending, or other regulated industries.
Experience with feature flagging, A/B testing, and data-driven product development.
Native mobile development experience (Swift/Kotlin).

Responsibilities

Collaborate within a cross-functional team that includes product, design, backend engineering, and quality engineers to deliver seamless borrower experiences across web and mobile.
Own projects end to end -- from technical design and architecture through launch, iteration, and measurement -- driving outcomes that move the business forward.
Build and evolve our React and React Native applications within a pnpm/Turborepo monorepo, shipping features that work beautifully on every platform.
Design and maintain shared component libraries and cross-platform modules that accelerate development across multiple product teams.
Partner with backend and platform engineering teams to integrate with GraphQL and RESTful APIs in a performant, reliable, and secure manner.
Identify and drive improvements in performance, testing, accessibility, and developer experience that make the entire team more effective.
Uphold high standards of code quality and user experience while iterating rapidly in a regulated environment.
Leverage AI-powered tools (coding assistants, automated testing, code review) to amplify your productivity and help establish best practices for AI-assisted development across the team.
Contribute to a strong, inclusive engineering culture by mentoring peers, championing best practices, and participating in thoughtful code reviews.