ThredUp is transforming resale with technology and a mission to inspire the world to think secondhand first. By making it easy to buy and sell secondhand, ThredUp has become one of the world's largest online resale platforms for apparel, shoes and accessories. Sellers love ThredUp because we make it easy to clean out their closets and unlock value for themselves or for the charity of their choice while doing good for the planet. Buyers love shopping value, premium and luxury brands all in one place, at up to 90% off estimated retail price. Our proprietary operating platform is the foundation for our managed marketplace and consists of distributed processing infrastructure, proprietary software and systems and data science expertise. With ThredUp's Resale-as-a-Service, some of the world's leading brands and retailers are leveraging our platform to deliver customizable, scalable resale experiences to their customers. ThredUp has processed over 172 million unique secondhand items from 55,000 brands across 100 categories. By extending the life cycle of clothing, ThredUp is changing the way consumers shop and ushering in a more sustainable future for the fashion industry.
ThredUp is reshaping how the world thinks about secondhand fashion. As a Senior Full Stack Engineer (Core E-comm), you'll take ownership of the systems that power our buyer experience, from seamless onboarding to checkout and returns. At ThredUp's scale, your work won't just ship features; it will influence architecture, raise engineering standards, and directly impact millions of customers discovering sustainable fashion every day.
You'll work across our stack — from our Ruby on Rails monolith and adjacent microservices to our TypeScript/React-powered PWA — balancing improvements to mature systems with forward-thinking modernization efforts. You'll have the opportunity to drive long-term architectural enhancements in distributed systems, event-driven design, developer experience, and scalable frontend architecture.