Software Product Design Engineer

Build polished, thoughtful product experiences at YC

Y Combinator builds the software that runs YC — internal tools used by partners and founders, public products used by the broader startup ecosystem, and AI-powered systems that automate complex workflows. Our team is small, the impact is large, and we ship real product to real users frequently.

We’re looking for a Software Product Design Engineer — someone who lives at the intersection of design and engineering. You’ll design beautiful user experiences, translate high-fidelity mocks into production code, and proactively elevate existing interfaces with thoughtful detail and interactions.

What you’ll do

Design compelling, clear UI/UX and produce high-quality mocks that demonstrate strong product taste.

• Turn design mocks (yours or others’) into pixel-perfect, production-ready frontends using modern web tech.

• Iterate on existing interfaces by improving layout, interaction quality, motion, and design consistency.

• Work closely with engineers, partners, and stakeholders — you’ll own the design and implementation of features end-to-end.

• <