Senior Software Engineer (React / React Native)

Prosper Marketplace; San Francisco (CA); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Vacation policy

PTO & holidays

Stock options

401K matching

Health insurance

Prosper Fit stipend

Commuter assistance

Snacks & drinks

Happy hours

Perkspot discounts

One Medical

SF rooftop

Job summary

Prosper Marketplace is seeking a Senior Frontend Engineer to own borrower-facing experiences from rate check through funding, building and maintaining web and mobile apps with React and React Native. You will contribute to AI-powered development workflows and ship features that improve conversion and borrower satisfaction.

You will collaborate with product, design, backend, and quality engineers within a Turborepo/pnpm monorepo, design reusable components, and integrate GraphQL and RESTful APIs.

Qualifications

• Hands-on React/React Native development in a fintech setting.
• Experience building borrower-facing web/mobile experiences.
• Strong UX/UI focus and attention to financial flows.

Responsibilities

• Own end-to-end frontend features from design to launch and iteration.
• Collaborate with product, design, backend and QA to deliver seamless experiences.
• Improve performance, accessibility and test automation.
• Mentor peers and drive best practices across the team.
• Leverage AI-powered tools to boost productivity and code quality.

Skills

React

TypeScript

GraphQL

REST APIs

UX polish

Testing

CI/CD

A/B testing

Expo

Tamagui

styled-components

Mobile deployment

Education

BS in EE/CS

MS in EE/CS

Tools

pnpm

Turborepo

Vite

Apollo

Jest

Playwright

Detox

Expo

App Store

Google Play

Job description

• 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
• 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

Benefits

• Take-what-you-need (paid) vacation for salaried employees
• 20 days of PTO and 7 paid holidays/year for hourly employees
• Stock options
• 401K retirement savings plan with generous matching
• Comprehensive health, dental and vision insurance plans, with options specific to your own health coverage needs
• Prosper Fit - A monthly stipend to use for gym memberships, personal training sessions, yoga and exercise classes, or club sports/fitness fees
• Pre-tax commuter/parking assistance
• Snacks and beverage selections in our kitchen
• Monthly meet-and-greet happy hours
• Perkspot discount programs
• One Medical
• SF Location - Rooftop deck with ping-pong and foosball table

Familiarity with monorepos (pnpm, Turborepo), bundlers (Vite), and CI/CD pipelines to maintain a high‑velocity development environmentBS in EE/CS with 8+ years of experience or MS in EE/CS or other applicable disciplines with 6+ years of experienceActive use of AI coding assistants (Cursor, Copilot) and a commitment to exploring new AI developments to enhance team productivity and solve product problemsA deep focus on the "borrower behind the screen," sweating the details to maintain trust in a domain where financial accuracy is paramountA sharp eye for UX/UI polish, ensuring high‑stakes financial flows feel intuitive, professional, and reliableExcellence in cross‑functional communication and a dedication to elevating the team through clear mentorship and knowledge sharingHands‑on experience with GraphQL (Apollo) and RESTful APIs to power high‑performance applicationsDeep proficiency in React, React Native, and TypeScript, with the versatility to move seamlessly between web and mobile platforms if applicableDisciplined approach to automated testing using tools like Jest, Playwright, or Detox to ensure systems are meticulous and trustworthyA proactive, high‑accountability approach to driving projects to completion and unblocking yourself to deliver outcomes, not just outputsExperience 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 industriesExperience with feature flagging, A/B testing, and data‑driven product developmentNative mobile development experience (Swift/Kotlin)