Email API for developers
Backend Engineer, Core Sending
Location
Europe
Posted
59 days ago
Salary
$150K - $170K / year
Seniority
Senior
Job Description
Backend Engineer, Core Sending
Resend
• Build and operate Resend’s email transport infrastructure • Work on SMTP delivery, MTA systems, routing, retries, backoff strategies, and delivery controls • Design systems for domain-level, provider-level, customer-level, and IP-level throttling • Build infrastructure for shared IP pools, dedicated IPs, warmup execution, and reputation-aware routing • Improve how Resend classifies bounces, deferrals, transient failures, hard failures, and delivery outcomes • Build tools that help the team debug delivery issues by customer, domain, mailbox provider, route, IP, message type, and event • Help design systems that make sending behavior safer, more observable, and easier to operate • Translate reputation strategy into backend systems • Partner with Trust & Safety to build controls that protect Resend’s sending network from abuse • Participate in incident response for sending, provider, and deliverability-sensitive issues • Be on-call for critical services
Job Requirements
- Have strong backend engineering experience
- Have worked on email, messaging, notifications, communications, infrastructure, or other high-volume delivery systems
- Understand queues, workers, retries, idempotency, rate limits, backpressure, and distributed systems
- Have experience or strong interest in SMTP, MTAs, DNS, bounces, deferrals, DNS, IP pools, and mailbox-provider behavior
- Care about reliability, observability, operational excellence, and reducing blast radius
- Have low ego, high ownership, and strong taste for simple systems
- Have experience working on applications with a high workload (Exceptional fit)
- Know about email best practices, or are willing to learn more about this space (Exceptional fit)
- Are experienced in Typescript and Golang (Exceptional fit)
Benefits
- 100% remote team with flexible working schedules
- Autonomy to "just ship it"
- Ownership of problems and solutions
- Modern tech stack (Typescript, AWS, Go, Postgres, Datadog)
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