Engineering Manager - SMS Delivery

About the role

The SMS Delivery team owns Klaviyo's mobile sender platform: the systems that allow brands to select, register, and activate the sender identities they use to send messages on SMS, RCS, WhatsApp, and future mobile channels. Mobile is one of Klaviyo's fastest-growing product areas, and this team's platform sits in the path of every customer who adopts a mobile channel. As Engineering Manager, SMS Delivery, you will lead a team of backend and full-stack engineers building this platform. You will own the team's roadmap, technical direction, and operational health. You will work closely with Product, Compliance, Data Science, and adjacent mobile channel teams to deliver self-serve sender registration and KYC, registration lifecycle visibility for customers, and the cross-channel sender management framework that future channels will build on. This is a hands-on technical leadership role. You will set direction, lead design reviews, mentor senior engineers, and contribute to code where it has the most leverage. How You Will Make a Difference Lead, mentor, and grow a team of engineers building Klaviyo's mobile sender registration, KYC, and lifecycle platform. Own hiring, performance, career development, and team culture. Define the team's roadmap with your Product partner. Sequence and deliver work that improves mobile activation and time-to-first-send for customers. Drive architecture across sender management, provider integration, mobile account lifecycle, and the cross-channel KYC platform. Evolve the team's platform into a unified, channel-agnostic framework that new mobile channels can adopt without rebuilding foundational logic. Move sender registration into automated, in-app, API-driven workflows that customers can complete on their own across markets and sender types. Raise the bar on reliability and observability with meaningful SLOs, actionable alerting, end-to-end testing, and registration lifecycle telemetry your team and customers can rely on. Stay engaged with the code through design reviews, code reviews, and the occasional prototype to de-risk complex decisions. Partner across the Mobile Channels organization with the WhatsApp, RCS, Compliance, and Data Science teams to deliver cohesive customer outcomes. Put AI to work in how the team operates and what the platform delivers, including automated registration triage, anomaly detection, and agentic operations for sender management.