Software Engineer - Email Channel
Senior Software Engineer responsible for owning the email channel end-to-end, working across the stack, and bringing systems thinking and product craft to deliver reliable and scalable email infrastructure and product surfaces.
Hi, I'm Brian, Senior Director of Engineering at Customer.io . We're looking for experienced engineers who want to own the email channel end to end — from the infrastructure that delivers billions of messages reliably, to the product surfaces our customers use to build, send, and analyze their campaigns. You'll work across the stack, bringing both systems thinking and product craft to one of the most technically rich channels in the industry.
About Customer.io
Over 8,000 companies — from scrappy startups to global brands — use our platform to send billions of emails, push notifications, in-app messages, and SMS every day. Customer.io powers automated communication that people actually want to receive.
We help teams send smarter, more relevant messages using real-time behavioral data. Under the hood: Go, React, Ember and AI help us ship fast and scale with confidence.
What We Value
Ownership
You own problems end to end. You move fast, act like an owner, and thrive in ambiguity. You've led complex projects before, whether officially or not, and you're ready to do it again.
Engineers with product taste
You think like a user, not just an engineer. You care how your systems power real customer value — and how to make them better.
A healthy skepticism for "the way things are done"
You bring rigor and creativity. Best practices matter — but never more than forward motion.
Channel depth
You understand the email ecosystem: how messages are routed, authenticated, delivered, and measured. You bring that knowledge into both your backend architecture and the product experiences you build on top of it.
What You'll Do
What We're Looking For
Posted June 6, 2026