Whatnot - Senior Backend Engineer, International Eng

• Marketplace operational tooling and automation • As a Senior Backend Engineer, you'll design and build highly scalable systems that support millions of transactions across multiple countries and regulatory environments. • Example projects include: • Building VAT tooling and seller-facing tax infrastructure for EU and UK markets • Designing cross-border shipping and Delivered Duty Paid (DDP) experiences that enable international commerce • Building systems to support market-specific requirements including Right of Withdrawal, refund automation, and regulatory compliance. Expanding Seller Protection Systems (SPS) into international markets • Developing operational tooling that enables efficient international marketplace operations • Partnering with internal logistics, payments, and platform teams to build durable long-term infrastructure • The work spans everything from deep backend architecture and distributed systems design to product-facing experiences that directly impact buyer trust and seller success. • 5+ years of professional software engineering experience • Strong backend engineering experience in distributed systems or large-scale platforms • Experience designing, operating, and scaling reliable production services • Strong proficiency in Python or Go. • Experience working with relational databases and event-driven architectures • Ability to drive projects independently from ambiguous problem statements to production launch • Excellent communication skills and ability to collaborate across engineering, product, operations, and business stakeholders • Preferred • Preferred • Experience with payments, fintech, e-commerce, logistics, marketplace platforms, or compliance systems • Experience building operational platforms, workflow systems, or transaction processing infrastructure • Experience working in rapidly growing product organizations • 💛 EOE • 💛 EOE