Lead Software Engineer, Messaging Infrastructure

The Messaging Infra organization at Klaviyo is focused on high-growth customer engagement through various messaging channels (email, SMS/MMS/RCS, mobile push, WhatsApp, and more). We work with multiple stakeholders to provide best-in-class service and reliability to connect a wide range of businesses, from entrepreneurs to enterprises, with their end users. The messaging platform is a mission-critical system, responsible for delivering billions of messages, and must be architected for massive sc

8+ years of engineering experience with strong backend and distributed systems design skills. Proficient in Python and/or Go, and able to pick up the other quickly. Experienced with large-scale system architecture — familiar with the tradeoffs involved and able to apply them against real business constraints. Comfortable contributing to architecture and code directly; this is a hands-on role. Skilled in scaling infrastructure on AWS. Strong product and business mindset — you think beyond the