About the role

Role overview

Customer.io is hiring a Senior Site Reliability Engineer to help scale its infrastructure, reduce operational toil, and improve reliability as the company grows.

Responsibilities

Build and scale infrastructure to support billions of messages per day and real-time events.
Automate deployments, alerting, and incident response.
Improve the on-call experience with clearer alerts, solid documentation, and faster resolution.
Tune MySQL and other datastore performance to increase reliability across distributed systems.
Collaborate across teams to debug, ship, and support production systems.
Share knowledge and raise the bar via public progress (e.g., short videos, writing) and mentorship.
Use AI tools to prototype faster and make better decisions.

Requirements

7+ years in SRE or infrastructure roles improving production systems at scale.
Deep MySQL experience, including schema design, performance tuning, and operational tooling.
Fluency in cloud-native technologies (with GCP as a plus).
Terraform proficiency.
Proficiency in Go and Bash for scripting and systems programming.
Strong observability, incident response, and distributed systems debugging skills.
Strong ownership mindset and preference for action over perfection.

Nice-to-haves

Experience with Go-based infrastructure systems at high scale.
Background using AI tools for prototyping and decision-making.

About Customer.io

Customer.io is a customer engagement platform used by thousands of companies to send automated emails, push notifications, in-app messages, and SMS. It uses real-time behavioral data to help teams deliver smarter, more relevant messaging at massive scale. The company builds and operates its platform with modern engineering tooling and a focus on reliability and developer experience.