Senior Software Engineer – Email Channel

🕒 May 12

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Customer.io

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2012

☁️ SaaS

💰 Series A on 2022-03

SaaS • Marketing

Customer. io is a customer engagement platform that helps businesses create personalized journeys across multiple channels, such as email, SMS, and in-app messaging, by leveraging first-party data. The platform offers solutions for crafting and automating messages with high flexibility and customization. It includes features such as data pipelines for managing customer data, visual workflow builders for automation, and tools for analytics and A/B testing to optimize messaging campaigns. Designed to scale with businesses of all sizes, Customer. io integrates with existing tools and provides a secure, compliant environment with high uptime, making it a trusted choice for over 7,400 brands globally.

📋 Description

• 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

🎯 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