Fullstack Engineer

About The Company Whatnot is the largest live shopping platform in North America and Europe, revolutionizing the way people buy, sell, and discover products online. By blending community engagement, entertainment, and e-commerce, Whatnot creates a dynamic marketplace that caters to a diverse range of interests, from fashion and beauty to electronics and collectibles such as trading cards, comic books, and live plants. With a focus on innovation and user-centric experiences, Whatnot operates as a remote co-located team with hubs across the US, UK, Germany, Ireland, and Poland. The company is committed to building the future of online marketplaces by fostering a culture of bold problem-solving and continuous growth, enabling users to turn passions into thriving businesses and connect through shared interests. About The Role The Buyer Growth team at Whatnot is dedicated to driving top-of-funnel growth and ensuring the success of first-time buyers. This role focuses on enhancing user acquisition, activation, and early retention by collaborating closely with product, data, design, and marketing teams. As a Fullstack Engineer in this team, you will lead and scale critical growth initiatives such as onboarding flows, referral systems, guest browsing, and notification systems. You will be responsible for designing and owning end-to-end systems that impact millions of users, making architectural decisions to ensure reliability, scalability, and extensibility as the platform grows rapidly. Your work will involve identifying high-leverage growth opportunities, rapidly iterating on experiments, and continuously improving funnels to increase new user conversion and retention. Additionally, you will mentor other engineers, fostering a culture of engineering excellence across the team. This role offers flexibility to work remotely or from one of the company's global office hubs, with a preference for candidates residing within commuting distance of San Francisco, Los Angeles, New York City, or Seattle. Qualifications

• 5+ years of full-time, generalist software engineering experience in high-growth technology companies
• Proven track record of delivering impactful, user-facing products autonomously
• Bachelor’s Degree in Computer Science or a related field, or equivalent work experience
• Strong foundation in both backend and frontend development, comfortable working across layers and integrating systems end-to-end
• Excellent product instincts with a user-first mindset
• Ability to take ownership of ambiguous areas and drive impactful solutions
• Adaptability to work across multiple workstreams in a fast-paced environment

Preferred Qualifications

• Experience building e-commerce or social products
• Expertise in mobile and/or full-stack web development frameworks
• Familiarity with growth engineering strategies, A/B testing, and analytics

Responsibilities

• Lead and scale critical growth initiatives such as onboarding flows, referral systems, guest browsing, and notification systems
• Design and own end-to-end systems impacting millions of users, including backend services and frontend experiences
• Make architectural decisions to ensure systems are reliable, scalable, and extensible as the platform scales
• Collaborate with product, marketing, and data science teams to identify and capitalize on high-leverage growth opportunities
• Rapidly iterate on experiments to optimize user acquisition, activation, and retention funnels
• Instrument, monitor, and improve key metrics to drive measurable growth in new user conversion and retention
• Mentor fellow engineers and contribute to elevating engineering standards across the team

Benefits

• Flexible time-off policy and company-wide holidays, including spring and winter breaks
• Comprehensive health insurance options covering medical, dental, and vision
• Support for remote work, including home office setup allowance
• Monthly allowances for cell phone and internet expenses
• Care benefits and wellness allowances to support employee health and well-being
• Annual childcare allowance and lifetime family planning benefits such as adoption and fertility expenses
• Retirement plans including 401(k) with employer match (up to 4%) in the US and pension plans internationally
• Monthly allowance to support product testing and internal use
• Parental leave: 16 weeks of paid parental leave plus a gradual return period

Equal Opportunity Whatnot is proud to be an Equal Opportunity Employer. We value diversity and are committed to creating an inclusive environment for all employees. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, parental status, disability, or any other protected characteristic under applicable law. We believe that embracing diverse skills and perspectives enhances our work culture and drives innovation. All qualified applicants are encouraged to apply.