<p class="font-claude-response-body break-words whitespace-normal" data-sourcepos="3:1-3:444;35-478">Hi, I'm Brian, Senior Director of Engineering at Customer.io. We're looking for experienced engineers who want to own a 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 problem spaces in the industry.</p> <p class="font-claude-response-body break-words whitespace-normal" data-sourcepos="5:1-5:261;480-740"><strong>You don't need email experience to apply.</strong> We can teach you the email domain. The engineers who thrive here are the ones who love learning a deep problem space, not only the ones who arrive already knowing it.</p> <h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold" data-sourcepos="7:1-7:21;742-762">About Customer.io</h2> <p class="font-claude-response-body break-words whitespace-normal" data-sourcepos="9:1-9:246;764-1009">Over 9,000 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.</p> <p class="font-claude-response-body break-words whitespace-normal" data-sourcepos="11:1-11:169;1011-1179">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.</p> <h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold" data-sourcepos="13:1-13:17;1181-1197">What We Value</h2> <p class="font-claude-response-body break-words whitespace-normal" data-sourcepos="15:1-16:184;1199-1396"><strong>Ownership</strong> 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.</p> <p class="font-claude-response-body break-words whitespace-normal" data-sourcepos="18:1-19:128;1398-1558"><strong>Engineers with product taste</strong> You think like a user, not just an engineer. You care how your systems power real customer value — and how to make them better.</p> <p class="font-claude-response-body break-words whitespace-normal" data-sourcepos="21:1-22:92;1560-1706"><strong>A healthy skepticism for "the way things are done"</strong> You bring rigor and creativity. Best practices matter — but never more than forward motion.</p> <h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold" data-sourcepos="27:1-27:18;2009-2026">What You'll Do</h2> <ul class="[li_&]:mb-0 [li_&]:mt-1 [li_&]:gap-1 [&:not(:last-child)_ul]:pb-1 [&:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1" data-sourcepos="29:1-36:109;2028-3054"> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="29:1-29:151;2028-2178">Build and evolve the frontend experiences customers use to create, preview, and analyze campaigns — editors, configuration, and analytics dashboards</li> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="30:1-30:161;2179-2339">Design and scale backend systems that process high volumes of messages and events: queue management, retry logic, rate limiting, and real-time event pipelines</li> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="31:1-31:159;2340-2498">Build automated systems that respond intelligently to feedback signals from external providers — classification, suppression, throttling, and health scoring</li> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="32:1-32:145;2499-2643">Partner with in-house domain experts to turn their knowledge into automated tooling — you bring the systems skills, they bring the email depth</li> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="33:1-33:106;2644-2749">Instrument and monitor channel health end to end: signal detection, anomaly alerting, and observability</li> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="34:1-34:103;2750-2852">Own problems end to end — from architecture and schema design to testing, deployment, and monitoring</li> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="34:1-34:103;2750-2852">Participate in an on-call rotation as required, supporting the reliability of the systems you build</li> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="35:1-35:93;2853-2945">Share knowledge and raise the bar through short videos, thoughtful writing, and mentorship</li> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="36:1-36:109;2946-3054">Use AI agents to make multi-file changes by scoping the work, writing the prompt, and verifying the output</li> </ul> <h2 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold" data-sourcepos="38:1-38:26;3056-3081">What We're Looking For</h2> <ul class="[li_&]:mb-0 [li_&]:mt-1 [li_&]:gap-1 [&:not(:last-child)_ul]:pb-1 [&:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1" data-sourcepos="40:1-47:77;3083-3953"> <li class="font-claude-response-body whitespace-normal break-words pl-2" data-sourcepos="40:1-40:110;3083-3192">7+ years of experience building scalable, distributed systems