Senior Software Engineer, Backend - Customer.io

About the Role

Customer.io is looking for experienced backend engineers who care deeply about reliability, performance, and scalability. You will design, build, and evolve the systems that power communication at massive scale while helping us push the boundaries of engineering excellence.

What You’ll Do

• Design and build distributed systems in Go to facilitate timely, relevant messaging at scale.
• Collaborate across teams to debug issues and deliver reliable solutions.
• Own problems end-to-end, from architecture and schema design to testing, deployment, and monitoring.
• Share knowledge and raise the bar through public progress updates, technical writing, and mentorship.
• Utilize AI agents to perform multi-file changes by scoping work, writing prompts, and verifying outputs.

What We’re Looking For

• 7+ years of experience building scalable, distributed systems in Go or similar statically typed languages.
• Comfort working in cloud-native environments (AWS, GCP).
• Familiarity with relational databases (MySQL) and an understanding of performance tradeoffs.
• Experience with observability tooling and operating production systems.
• A bias for action over perfection and pride in owning technical decisions.

What We Value

• Ownership: You own problems end-to-end, move fast, and thrive in ambiguity.
• Product Taste: You think like a user and care about how your systems power real customer value.
• Healthy Skepticism: You bring rigor and creativity, prioritizing forward motion over rigid adherence to "the way things are done."

Benefits

• 100% coverage of medical, dental, vision, mental health, and supplemental insurance premiums for you and your family.
• 16 weeks paid parental leave.
• Unlimited PTO.
• Stipends for remote work and wellness.
• Professional development budget.

Our Process

We maintain a clear, human-centric hiring process:

1. Application Review
2. Recruiter Call (30 mins)
3. Hiring Manager Interview (60 mins)
4. Technical Interview (60 mins)
5. Take-Home Assignment
6. Assignment Review Call (60 mins)