User Experience Designer

About us

We're a stealth-stage, real-time group payments platform built with Kotlin Multiplatform, focused on making shared expenses seamless across dining, travel, events, and everyday group spending. The product combines automated expense splitting, real-time payment coordination, and flexible payment options in a single mobile experience.

Our shared UI platform powers iOS, Android, and desktop from a single Compose Multiplatform codebase.

To apply, email us at View email address on click.appcast.io

What you'll own

Cross-platform UX design and refinement

• Design and iterate on user experiences across iOS, Android, and desktop, ensuring a unified and consistent design system

• Own the user experience journey from initial concept through polished UI specifications

• Contribute to scaling the product with a focus on usability and design excellence

Design system and interaction architecture

• Define interaction patterns, navigation flows, and visual hierarchy for new and existing screens

• Develop and maintain the component library/design system, ensuring consistency and adherence to platform-specific guidelines (iOS/Android)

• Collaborate with engineering to establish clean boundaries between design specifications and technical implementation

User research and feedback loop

• Conduct focus groups, user interviews, and usability testing (e.g., walking users through the app, observing use, and identifying unclear UI or features)

• Analyze user feedback and behavioral data to identify key pain points and opportunities for improvement

• Use insights from user research to drive design decisions and iterative product improvements

Design-to-platform alignment

• Ensure designs leverage native mobile capabilities (e.g., authentication, deep linking, push notifications, sharing, and contacts) while maintaining a cohesive multiplatform brand identity

• Validate designs against platform standards (iOS/Android) and usability best practices

Product velocity

• Deliver high-quality design work rapidly in a fast-moving environment with frequent mobile releases

• Participate in feature planning, design critiques, and product strategy sessions

• Document design specifications and handoff materials to maintain design standards and maximize development efficiency

Required experience

UX design and prototyping tools

• 3+ years of production experience in mobile UX/UI design

• Expert proficiency with modern design and prototyping tools (e.g., Figma, Sketch)

Mobile and multiplatform design

• Extensive experience designing complex, reactive mobile UIs (iOS and Android)

• Deep understanding of mobile design patterns, usability principles, and accessibility standards

User research and data analysis

• Experience planning and conducting various user research methods, including usability testing and focus groups

• Ability to translate quantitative and qualitative data into actionable design insights

Design system management

• Experience defining, maintaining, and scaling a comprehensive design system or component library for multiplatform products

• Comfortable collaborating within an integrated product and engineering workflow

Nice to have

• Experience with design tools that integrate with Compose (or similar declarative UI frameworks)

• Experience with realtime applications or fintech products

• Experience performing end-to-end UX audits and competitive analysis

• Familiarity with startup product environments and rapid iteration cycles

How this role works day-to-day

We operate with a strongly opinionated design system and product focus, built for long-term maintainability and fast iteration. UX designers are expected to think critically about user needs, design consistency, and product scalability, not just visual output.

The team ships quickly and collaboratively. Design, engineering, and product decisions are tightly integrated, and designers are expected to move comfortably between user research, visual design, and product strategy discussions.

You'll be joining at a stage where the platform is already substantial in scope, but still early enough to have major influence over user experience, design standards, and the future of the product.