Fullstack Engineer, Seller Growth

Fullstack Engineer, Seller Growth 🚀 JOIN THE FUTURE OF COMMERCE WITH WHATNOT! Whatnot is the largest livestream shopping platform in North America and Europe to buy, sell, and discover the things you love. Whether it's trading cards, fashion, electronics, or live plants, our sellers are building real businesses across hundreds of categories. We're building live commerce at a scale that's never been done in the West, and there's no playbook to copy. The people here are shaping how an entirely new industry develops. As a remote co-located team, we're inspired by our values https://www.whatnot.com/careers and anchored in hubs across the US, UK, Ireland, Poland, Germany, and Australia. We move fast, stay close to our users, and focus on the work that drives the most impact. We're one of the fastest growing marketplaces https://a16z.com/marketplace-100/ and were recently named the #1 Best Startup Employer in America http://google.com/search?q=%231+forbes+startup+employer&oq=%231+forbes+startup+employer&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIGCAEQRRg9MgYIAhBFGD0yBggDEEUYQDIGCAQQRRhAMgYIBRBFGEDSAQg1NzM0ajBqMagCALACAA&sourceid=chrome&ie=UTF-8 by Forbes. Check out the latest Whatnot updates on our news https://blog.teamwhatnot.com/ and engineering blogs https://medium.com/whatnot-engineering and join us as we enable anyone to turn their passion into a business and bring people together through commerce. 💻 ROLE Seller Growth is responsible for growing sellers on Whatnot — enabling them to turn their hobbies into businesses. Within Seller Growth, the Platform pod ensures that this growth is sustainable, trustworthy, and scalable. As our next software engineer on the Seller Growth Product pod, you will design and build the systems that sit at the heart of the new seller funnel. Your work will focus on: - Protecting the funnel from fraud and abuse: Developing and scaling systems for identity verification (IDV), fraud detection, and automated trust/risk reviews that safeguard buyers while minimizing friction for good sellers. - Ship seller-facing experiences: Deliver features across onboarding, education, and seller incentive flows — working across the full stack (backend and frontend). - Build platform intelligence: Develop seller enrichment pipelines and signals to route sellers to the right onboarding, incentive, and discovery paths. - Drive growth through experimentation: Design and analyze A/B tests to guide product decisions and accelerate seller success. - Create scalable infrastructure: Build and maintain data pipelines and growth systems (e.g., notifications, lifecycle triggers) that other pods and teams can leverage. This pod works at the intersection of growth, trust, and platform-ization. You’ll be responsible for deeply technical systems (IDV, fraud signal repositories, seller enrichment pipelines, predictive models) that directly influence GMV, seller retention, and buyer trust. The pace is fast: every week, thousands of sellers apply to sell, and your work ensures that Whatnot can confidently scale this influx without compromising marketplace integrity. 👋 YOU Curious about who thrives at Whatnot? We’ve found that embodying a low ego, growth mindset, and high-impact drive goes a long way here. As our next Fullstack Engineer, you should have (e.g. 3+ years of generalist software development experience in high growth startups), plus: - Bachelor’s degree in Computer Science, a related field, or equivalent work experience - Knowledge of multiple programming languages (we primarily use Python, Elixir, JavaScript—knowledge of these in particular not required) - Web development experience with React, using GraphQL for API development, and modern frontend applications (exposure to Next.js framework is not required but preferred) - Excellent product instincts—you first think about users rather than the best technical solution - You can mentor others, and prioritize building inclusive, supportive teams - Project owner—y ... (truncated, view full listing at source)