Staff Software Engineer, Backend at Customer.io

Confirmed open

Customer.io is hiring a staff software engineer, backend focused on backend architecture and services.

Customer.io

Location: Remote
Advertised region: Americas Remote
Work arrangement: remote
Technologies: React, AWS, GCP, Go

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Role overview

Hi, I'm Paul, VP of Engineering at Customer.io . We're looking for a staff engineer to set technical direction for the systems that move billions of messages a day. This isn't a role about shipping more, faster. It's about deciding what gets built, where the architecture needs to go next, and raising the ceiling for the engineers around you.

Responsibilities

Design, build and operate production software for backend architecture and services.
Collaborate with product, design, security and engineering partners.
Improve reliability, performance, testing, automation and documentation.
Turn customer and operational requirements into maintainable systems.

Qualifications

10+ years building scalable, distributed systems in Go (or similar statically typed languages), including several as the person others turned to on architecture
Depth across multiple systems or domains, not just one — you've been the recognized expert in more than one place
A track record of designing for production reality: you quantify tradeoffs in throughput, cost, and reliability rather than picking a reasonable path and defending it
Experience designing observability and recovery as first-class concerns — metrics, alerting, rollback, backpressure, checkpointing — not logging added afterward
Comfort working in cloud-native environments (AWS, GCP), with relational databases (we use MySQL) and a real understanding of performance tradeoffs
Evidence of making other engineers better: mentorship, technical writing, design review, standards that outlasted your involvement
A bias for action over perfection, and the judgment to know which decisions are worth slowing down for
We believe in transparency. Starting salary for this role is $200,000 - $240,000 USD (or equivalent in local currency) depending on experience and subject to market rate adjustment. This role also carries a 10% annual bonus target.
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.
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.
Hiring Manager Interview (60 mins) - Talk with one of our hiring managers about your working style and a project you've owned end-to-end, plus a short AI-assisted coding exercise.
Architecture Interview (60 mins) - A collaborative system design conversation focused on scaling challenges, tradeoffs, and failure modes.
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.

Technology in this role

React: Under the hood: Go, React, Ember and AI help us ship fast and scale with .
AWS: 10+ years building scalable, distributed systems in Go (or similar statically typed languages), including several as the person others turned to on architecture Depth across multiple systems or domains, not just one — you've been the recognized expert in more than one place A .
GCP: 10+ years building scalable, distributed systems in Go (or similar statically typed languages), including several as the person others turned to on architecture Depth across multiple systems or domains, not just one — you've been the recognized expert in more than one place A .
Go: It's about deciding what gets built, where the architecture needs to go next, and raising the ceiling for the engineers around .
MySQL: 10+ years building scalable, distributed systems in Go (or similar statically typed languages), including several as the person others turned to on architecture Depth across multiple systems or domains, not just one — you've been the recognized expert in more than one place A .
CAN: You connect architectural decisions to what customers actually experience, and you can explain that connection to people who don't write .

Benefits

Remote Americas or worldwide arrangement as stated in the official posting.
Opportunity to work on software used by technology customers.

About Customer.io

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.

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.

You take on the problems nobody has claimed yet — the ones that span squads, have no obvious owner, and would quietly cost us a year if left alone. You either solve them or get leadership aligned to.

You think like a user, not just an engineer. You connect architectural decisions to what customers actually experience, and you can explain that connection to people who don't write Go.

A healthy skepticism for "the way things are done"

You retire practices that have outlived their usefulness, including ones you helped build. Best practices matter — but never more than forward motion.

Your best quarter isn't measured by what you shipped. It's measured by what the department can now do that it couldn't before.

Employer website

How to apply

Review the original posting and apply through the employer’s careers page.

View source and apply

Source checked: 2026-10-11

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