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Whatnot Logo Whatnot · IT - Software Development

Software engineer payments

Poland, Kraków · Job Posted February 18, 2026
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Job Description

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.

Job Responsibility

  • Building reliable, scalable infrastructure
  • developing innovative ways for users to transact
  • play a central role in shaping the future of commerce on the platform
  • accountable for supporting the continued expansion of both buyers and sellers

Requirements

  • 3-5 or more years of software development experience building scalable systems that can handle millions of users
  • comfortable with multiple programming languages (we primarily use Python, Elixir, JavaScript - knowledge of these in particular not required)
  • excellent product instincts
  • 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
  • known for shipping products and features lightning-fast
  • excellent problem solver and don’t need to be told exactly what to do
  • open to doing frontend work when required
  • ability to pick up on new technologies very quickly
  • proven track record of delivering features

Nice to have

  • Experience with payment systems, infrastructure, experiences and international commerce
  • Startup experience at a high-growth company

What we offer

Flexibility to work from home or from one of our global office hubs

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