Founding Designer

We’re on a mission to make conversational AI agents think and respond at the speed of human conversation, everywhere they run. Today’s retrieval stack wasn’t built for real-time reasoning, so we’re building Moss: the real-time semantic search layer for conversational AI. Backed by YC, we’re making every AI product feel instantaneous, deeply personalized, and actually useful in the real world.

We’re looking for a Founding Designer to own the design across Moss, end to end. Product, brand, experience. You’ll define how Moss looks, feels, and communicates at every touchpoint - from the developer dashboard and docs to the website, pitch decks, and brand identity. Your job is to make Moss feel as fast and polished on the surface as it is under the hood.

This is not a “make it pretty” role. You’ll sit at the intersection of product, engineering, and GTM. You’ll shape how developers discover Moss, how they experience it, and how the brand shows up in the world. Design is a first-class function here, not an afterthought.

What You’ll Do

• Own the full design surface: product UI, developer experience, marketing, and brand.
• Design the Moss developer dashboard, onboarding flows, and core product interfaces.
• Build and evolve our brand identity, visual language, and design system from the ground up.
• Design our website, landing pages, launch assets, and campaign materials.
• Shape the developer experience visually: docs layout, code snippet presentation, error states, empty states, and loading patterns that make a real-time product feel real-time.
• Create pitch decks, investor materials, and sales collateral that tell a clear, compelling story.
• Work directly with the founders and engineering team to turn product direction into shipped interfaces.