Senior Site Reliability Engineer

Over 7,500 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.

We’re looking for a Site Reliability Engineer to help us scale our infrastructure, reduce operational toil, and increase reliability as we grow. If you’ve worked on high-scale systems and love making platforms better for developers and customers alike, we’d love to meet you.

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 think about performance, reliability, and how systems impact the customer experience.

A healthy skepticism for “the way things are done” You bring rigor and creativity. Best practices matter - but never more than forward motion.

What You’ll Do

• Build and scale infrastructure to support billions of messages per day and real-time events
• Automate deployments, alerting, and incident response
• Make our on-call better - clear alerts, solid documentation, and faster resolution
• Tune MySQL and other datastore performance and improve reliability across distributed systems
• Collaborate across teams to debug, ship, and support systems in production
• Share knowledge and raise the bar through sharing your progress publicly with short videos, thoughtful writing, and mentorship
• Leverage AI tools to prototype, move faster, and make better decisions

What we're looking for

We believe in transparency. Starting salary for this role is $140,000 - $180,000 USD (or equivalent in local currency) depending on experience and subject to market rate adjustment.

We know our people are what make us great, and we’re committed to taking great care of them. Our inclusive benefits package supports your well-being and growth, including 100% coverage of medical, dental, vision, mental health, and supplemental insurance premiums for you and your family. We also offer 16 weeks paid parental leave, unlimited PTO, stipends for remote work and wellness, a professional development budget, and more.

No gotchas, no trick questions - just a clear, human process designed to help both of us make an informed decision.

All final candidates will be asked to complete a background check and employment verifications as part of our pre-employment process.

Customer.io recognizes the stifling impact of systemic injustice on diverse communities. We commit to using our influence to increase inclusion and equity within the tech industry. We strive to build an inclusive team culture, implement bias-free hiring practices, and develop community partnerships to expand our global impact.

Zoom is the only video conference platform that we use, virtual interviews will be conducted using the video capability (i.e., not via the chat), and offers will be extended in writing on official Customer.io letterhead. Please be vigilant in all of your job search activity, and if you have any questions please contact jobs@customer.io.

We believe in empathy, transparency, responsibility, and, yes, a little awkwardness. If you’re excited by what you read and want to build software that makes communication better for everyone—apply now.

Apply for this job

indicates a required field

First Name

Last Name

Preferred First Name

Email

Phone

Resume / CV

Enter manually

Accepted file types : pdf, doc, docx, txt, rtf

Enter manually

Accepted file types : pdf, doc, docx, txt, rtf

What is your preferred first and last name?

Years of Experience

What location are you based in? (city, state, and country)

This should be the location you plan to consider your primary residence and are legally authorized to work in.

Were you referred to this position by a current or former team member? If so, please list their name below.

LinkedIn Profile

Have you previously been employed with Customer.io?

If you have previously been employed with Customer.io, please provide the department or role that you had.

Are you authorized to work in country of residence?

Will you require work authorization / visa sponsorship?

As a remote company, we hire across many locations, but we do have policies and team needs that influence where we can support employment. Because of this, we’re not able to offer visa sponsorship or relocation support at this time.

Voluntary Self-Identification

For government reporting purposes, we ask candidates to respond to the below self-identification survey.Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiringprocess or thereafter. Any information that you do provide will be recorded and maintained in aconfidential file.

As set forth in Customer.io’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law.

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection.As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measurethe effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categoriesis as follows :

A "disabled veteran" is one of the following : a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.

Select...

Voluntary Self-Identification of Disability

Form CC-305

Page 1 of 1

OMB Control Number 1250-0005

Expires 04 / 30 / 2026

Voluntary Self-Identification of Disability

Form CC-305 Page 1 of 1 OMB Control Number 1250-0005 Expires 04 / 30 / 2026

Why are you being asked to complete this form?

We are a federal contractor or subcontractor. The law requires us to provide equal employment opportunity to qualified people with disabilities. We have a goal of having at least 7% of our workers as people with disabilities. The law says we must measure our progress towards this goal. To do this, we must ask applicants and employees if they have a disability or have ever had one. People can become disabled, so we need to ask this question at least every five years.

Completing this form is voluntary, and we hope that you will choose to do so. Your answer is confidential. No one who makes hiring decisions will see it. Your decision to complete the form and your answer will not harm you in any way. If you want to learn more about the law or this form, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov / ofccp .

How do you know if you have a disability?

A disability is a condition that substantially limits one or more of your “major life activities.” If you have or have ever had such a condition, you are a person with a disability. Disabilities include, but are not limited to :

Disability Status Select...

PUBLIC BURDEN STATEMENT : According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.

#J-18808-Ljbffr