iOS (Fullstack) Engineer, Payments

Whatnot is the largest livestream 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, Ireland, Poland, and Germany, we’re building the future of online marketplaces—together.

From fashion, beauty, and electronics to rare 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 Payments team at Whatnot is fundamental to the product’s global operations. We power every order, collect every payment across a wide range of local and international methods, and manage returns, refunds, and seller payouts at scale. Each year, we process billions of dollars in payments, making us one of the most trusted and essential systems in the business.

As Whatnot grows rapidly, our team is directly responsible for enabling that growth—by building reliable, scalable infrastructure and developing innovative ways for users to transact. We play a central role in shaping the future of commerce on the platform and are accountable for supporting the continued expansion of both buyers and sellers in the years ahead.

Each member of the team has a lot of individual responsibility and many more freedoms, so we need to hire people we can trust. Your ability to make good trade-offs and exercise good judgment is essential to us.

As a iOS (Fullstack) Engineer on the Payments team, you’ll own and deliver end-to-end experiences across everything Payments touches — including adding and managing payment methods, completing purchases, and enabling seller cashouts. You’ll build seamless, high-trust flows on iOS, while also contributing to the backend systems that power them.

This is a true fullstack role: while your primary focus will be iOS, we expect you to dive into backend code when needed — whether to implement APIs, debug distributed systems, or ensure a clean integration between frontend and backend. You’ll collaborate closely with product, design, and other engineers to ship polished, reliable, and high-impact features that make it easier for people to transact on Whatnot.

Team members in this role are required to be within commuting distance of our Dublin, Ireland hub.

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 iOS (Fullstack) Engineer, you should have 3-5 or more years of software development experience building scalable systems that can handle millions of users, plus:

• You are comfortable working across the stack, with deep expertise in iOS development, and a willingness to contribute to backend code when needed

• 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 - you have strong ownership instincts and can own projects from inception to production, and beyond

• You are known for shipping products and features lightning-fast

• You are an excellent problem solver and don’t need to be told exactly what to do

• You are open to doing frontend work when required

• Ability to pick up on new technologies very quickly

• Proven track record of delivering features

• Experience with payment systems, infrastructure, experiences and international commerce (nice to have)

• Startup experience at a high-growth company (nice to have)

• Flexible Time off Policy and Company-wide Holidays (including a spring and winter break)

• 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

• Pension plan

• 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.