Senior Backend Engineer, Scalable Go Systems | Remote

customerio; United States; Remote; USD 150,000 - 200,000; Full time

Benefits offered by this job

Unlimited PTO

16 weeks parental leave

Remote work stipend

Professional development budget

Remote hiring process

Job summary

Customer.io is seeking a senior backend engineer to architect and evolve distributed systems behind a high-scale messaging platform delivering emails, push notifications, in-app messages, and SMS to billions. The role emphasizes reliability, performance, and ownership from design through deployment.

You will build Go services, own end-to-end decisions, and collaborate across teams to ensure scalable, observable production systems. A strong product focus and leadership in initiatives are valued.

Qualifications

• Seven or more years of experience building scalable, distributed systems
• Go or comparable statically typed language experience
• Experience in cloud-native environments (AWS or GCP)
• Familiarity with relational databases (MySQL)
• Hands-on observability tooling and operating production systems at scale
• Bias for action and ownership of significant technical decisions
• Product-oriented mindset delivering real user value

Responsibilities

• Design, build, and operate distributed services in Go powering large-scale message delivery
• Own end-to-end architecture, schema design, testing, deployment, and monitoring
• Collaborate across teams to debug production issues and deliver reliable solutions
• Participate in on-call rotation to support system reliability
• Mentor peers and raise engineering standards through knowledge sharing and writing
• Leverage AI-assisted tooling to scope and verify multi-file code changes

Job description

Customer.io is seeking a senior backend engineer to architect and evolve distributed systems behind a high-scale messaging platform delivering emails, push notifications, in-app messages, and SMS to billions. The role emphasizes reliability, performance, and ownership from design through deployment.

You will build Go services, own end-to-end decisions, and collaborate across teams to ensure scalable, observable production systems. A strong product focus and leadership in initiatives are valued.