Senior Backend Engineer, Platform

About Customer.io

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 deeply experienced backend engineer to help us architect and evolve the infrastructure behind our core platform. If you love solving tough distributed systems challenges at scale, this is your kind of role.

What We Value

Ownership

You drive technical direction across systems and teams. You move with urgency, build with empathy, and think long-term. You’ve led large-scale infrastructure initiatives and know what it takes to get them over the line.

Engineers with customer focus

You think about how infrastructure unlocks customer value. You care about developer experience, system design, and how your work shapes 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

• Design and evolve distributed systems in Go to handle billions of daily events and messages and store and index petabytes of data
• Lead architectural decisions around performance, reliability, and real-time event processing
• Improve service-to-service communication through better APIs, messaging systems, and event-driven patterns
• Work across teams to uncover bottlenecks and system issues, and lead initiatives to resolve them for a smoother customer experience
• Tackle high-throughput challenges across data pipelines, queues, and scheduling infrastructure
• Able to debug production systems at scale using effective instrumentation, and resolve issues quickly and confidently
• 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

• Significant experience (typically 10+ years) building scalable, distributed systems in Go (or similar statically typed languages)
• Deep experience with databases - relational (MySQL, Postgres) and non-relational (DynamoDB, BigTable) - and how to make them fast
• Comfort working in cloud-native environments (AWS, GCP)
• Familiarity with APIs, observability, and operating production systems
• A bias for action over perfection, and pride in owning technical decisions

Compensation & Benefits

We believe in transparency. Starting salary for this role is $160,000 - $250,000 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.

See full benefits here →

Our Process

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

• Application - We review everyone with care. Tell us why you're interested.
• Recruiter Call (30 mins) - Let’s chat about what you’re looking for and how we work.
• Behavioral Interview (60 mins) - Talk with one of our hiring managers. We’ll explore topics like ownership, product thinking, and collaboration.
• Technical Interview (60 mins) - A collaborative system design conversation focused on scaling challenges.
• Take-Home Assignment - Complete a short, realistic task similar to what you’d work on here.
• Assignment Review Call (60 mins) - Walk us through your work and discuss tradeoffs, priorities, and how you’d iterate.

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.

Join us!

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.