Customer.io logo
Customer.io

Customer.io helps companies communicate with their customers in a more authentic and human way. Its versatile marketing automation platform helps “bring human

Senior Software Engineer – Email Channel

Location

United States

Posted

21 days ago

Salary

$150K - $200K / year

Seniority

Senior

Job Description

Senior Software Engineer – Email Channel

Customer.io

• Build and evolve the frontend experiences customers use to create, preview, and analyze email campaigns — template editors, sending configuration, deliverability dashboards • Design and scale the backend systems that power high-volume email sending, including queue management, retry logic, and event processing (bounces, complaints, deferrals) • Own deliverability-adjacent systems: bounce classification, suppression management, IP/domain reputation monitoring, and feedback loop processing • Partner with our deliverability team to translate domain expertise into automated tooling — reputation scoring, warm-up schedules, sending throttles • Instrument and monitor the health of the email channel: inbox placement signals, block detection, ESP feedback, and alerting • Own problems end to end — from architecture and schema design to testing, deployment, and monitoring • Share knowledge and raise the bar through short videos, thoughtful writing, and mentorship • Use AI agents to make multi-file changes by scoping the work, writing the prompt, and verifying the output

Job Requirements

  • 7+ years of experience building scalable, distributed systems in Go (or similar statically typed languages)
  • Experience building product-facing frontend features in React or similar frameworks, with attention to UX quality and polish
  • Comfort working in cloud-native environments (AWS, GCP)
  • Familiarity with relational databases (we use MySQL primarily) and an understanding of performance tradeoffs
  • Familiarity with high-volume email sending concepts: bounce handling, feedback loops, and delivery event processing
  • Working knowledge of email authentication standards — SPF, DKIM, DMARC — and how they affect deliverability
  • Comfortable reasoning about sender reputation, IP warm-up, and ISP behavior at scale
  • Experience with observability tooling and operating production systems
  • Experience building or consuming APIs that handle high-throughput async workloads
  • A bias for action over perfection, and pride in owning technical decisions.

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
  • a professional development budget

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