Software Engineer, Merchant Tooling

Whatnot is the largest live shopping platform in North America and Europe to buy, sell, and discover the things you love. We’re re-defining e-commerce by blending community, shopping, and entertainment into a community just for you. As a remote co-located team, we’re inspired by innovation and anchored in our values. With hubs in the US, UK, Germany, Ireland, and Poland, we’re building the future of online marketplaces –together.

From fashion, beauty, and electronics to collectibles like trading cards, comic books, and even live plants, our live auctions have something for everyone.

And we’re just getting started! As one of the fastest growing marketplaces, we’re looking for bold, forward-thinking problem solvers across all functional areas. Check out the latest Whatnot updates on our news and engineering blogs and join us as we enable anyone to turn their passion into a business, and bring people together through commerce.

The Inventory team supports sellers with managing their merchandise on Whatnot and representing it as accurately as possible so they can reach more buyers. They strive to do this in the fewest steps possible so sellers can get back to what they do best: selling and engaging with their community. Merchant Tooling, a subteam of Inventory, supports the needs of our largest and most complicated sellers. Whatnot is committed to helping our sellers turn their passion into a business, and as they grow their business with us their needs evolve. We build the systems to be able to support external and internal tooling for sellers with needs at scale, such as integrations to other e-commerce platforms, WMS, ERPs, and accounting software.
As part of the Merchant Tooling team, you will design and build large-scale, highly reliable systems that support our largest and most complex customers. Your work will focus on:

• Delivering seamless, bi-directional data synchronization across marketplace, ecommerce, ERP, and other enterprise systems, ensuring accuracy, consistency, and low-latency data flow.

• Partnering closely with cross-functional stakeholders—including Product, Inventory, Operations, and external partners—to understand business needs, translate them into technical requirements, and drive aligned outcomes.

• Architecting and evolving enterprise-grade systems that remain intuitive for developers, easy to iterate on, and capable of supporting rapid product growth.

• Contributing to and accelerating the broader Inventory team roadmap, providing technical insight, proactive problem-solving, and hands-on implementation support.

At its core, this team is responsible for building solutions that power how larger enterprise-level sellers interface with our platform. Your contributions will directly shape the foundation that enables these sellers to onboard, operate, and scale successfully.
We offer flexibility to work from home or from one of our global office hubs, and we value in-person time for planning, problem-solving, and connection. Team members in this role must live within commuting distance of our Los Angeles, New York, San Francisco or Seattle hub.

Curious about who thrives at Whatnot? We’ve found that low ego, a growth mindset, and leaning into action and high impact goes a long way here.

As our next Software Engineer on Merchant Tooling, you should have 5+ years of generalist software development experience in high growth startups, plus:

• Bachelor’s Degree in Computer Science or related field or equivalent work experience.

• Experience building scalable systems (we primarily use Python, Elixir, JavaScript).

• Ability to work across the stack (backend and frontend).

• Excellent product instincts. You first think about users rather than the best technical solution.

• Proven track record of delivering features. You are known for shipping products and features lightning-fast.

• Ability to take ownership of an ambiguous area and define and then drive impact.

• Ability to flexibly work across multiple workstreams, thriving in a fast-paced environment.

• Scalability and data pipeline experience with SQL, dbt, etc.

• Experience in Shopify, Channel Advisor, Magento, and other ecommerce SAAS products a plus

• Experience in domain driven design a plus

• Generous Holiday and Time off Policy

• Health Insurance options including Medical, Dental, Vision

• Work From Home Support

  • Home office setup allowance

  • Monthly allowance for cell phone and internet

• Care benefits

  • Monthly allowance for wellness

  • Annual allowance towards Childcare

  • Lifetime benefit for family planning, such as adoption or fertility expenses

• Retirement; 401k offering for Traditional and Roth accounts in the US (employer match up to 4% of base salary) and Pension plans internationally

• Monthly allowance to dogfood the app

  • All Whatnauts are expected to develop a deep understanding of our product. We're passionate about building the best user experience, and all employees are expected to use Whatnot as both a buyer and a seller as part of their job (our dogfooding budget makes this fun and easy!).

• Parental Leave

  • 16 weeks of paid parental leave + one month gradual return to work *company leave allowances run concurrently with country leave requirements which take precedence.

Whatnot is proud to be an Equal Opportunity Employer. We value diversity, and we do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, parental status, disability status, or any other status protected by local law. We believe that our work is better and our company culture is improved when we encourage, support, and respect the different skills and experiences represented within our workforce.