Senior UX Designer Job San Francisco area,California USA,Design & Architecture

This position sits at the intersection of product design, technical platform work, and systems thinking
The Senior UX Designer on Foundations shapes the systems that ensure a consistent, secure, and accessible experience regardless of which product a customer is using
The work ranges from defining universal login patterns to designing unified payment flows, and it requires a designer who is as comfortable in an engineering conversation as in a design critique
The engineering team works in React-based frameworks and uses Figma alongside AI-assisted tooling, including Cursor and Figma MCP (Model Context Protocol)
This role is not a handoff-oriented role. The expectation is active collaboration with engineering through implementation, supporting engineers in translating design decisions into production-quality work and catching fidelity issues before they compound
The Foundations team owns the core services that much of Prosper's fintech portfolio depends on, including authentication and payments
Because this work sits at the platform level, design decisions here often have reach across multiple products and teams
This role also contributes to UX initiatives outside the Foundations team, including component infrastructure work that spans the broader product organization
Lead end-to-end UX design for authentication, payments, and other core platform services, from initial discovery through delivery
Partner with researchers by providing prototypes, design thinking, and artifact support that enable effective research across the platform
Serve as a thought partner to product managers, engineers, and security stakeholders, shaping how problems are framed before solutions are proposed
Develop and maintain clear, thorough design documentation that supports async decision-making, legal review, and cross-team alignment
Navigate legal and compliance approval workflows for features that intersect with financial regulation, security requirements, or data handling
Define the design direction for Foundations features, including universal login and payment flows, and maintain the systems-level patterns that those features depend on
Collaborate with engineers through implementation, reviewing production output against design intent, and flagging fidelity issues early
Use AI-assisted tools, including Cursor and Figma MCP (Model Context Protocol), to reduce repetitive tasks and keep design-to-code workflows efficient
Contribute to cross-team UX initiatives, including component infrastructure work, that extend beyond Foundations
Mentor UX team members on AI-assisted workflows and research-to-design best practices
First 30 Days:
Learn our products, design system, and compliance workflows while getting hands-on in Figma & Cursor to pair with engineering on initial tasks
By 60 Days:
Partner with Product & Engineering to ship medium-complexity projects, using our design system and clear documentation to keep UI consistent and ready for legal review
By 90 Days:
Own complex, end-to-end projects with high autonomy, contributing to cross-team strategy, design system infrastructure, and AI-assisted workflows

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

Clear communication in cross-functional settings, with the ability to work effectively alongside engineering, product, and security stakeholders
8-10+ years of product design experience focusing on design systems, platform UX, or component libraries (or equivalent combination of education and experience)
Confidence operating in a fintech or similarly regulated product environment
Systems-oriented design approach: a track record of designing for scale, reuse, and consistency across multiple products or surfaces
Deep fluency with Figma, including prototyping, auto-layout, component architecture, and design token management
Hands-on experience in AI-assisted development environments such as Cursor, Git Hub Copilot, or similar tools
Experience with Figma MCP or other design-to-code pipeline tooling
Background in accessibility standards applicable to financial products
Front-end fluency sufficient to read and discuss React-based code alongside engineers
Prior work on internal tooling or developer-facing design surfaces

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