Backend Engineer, Core Sending
New
Americas or European time zones, Americas or European time zonesFull-TimeMiddle
Salary150,000 - 170,000 USD per year
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Job Details
- Required Skills
- AWSTypeScriptGoPostgresDatadogDistributed Systems
Requirements
- Strong backend engineering experience
- Worked on email, messaging, notifications, communications, infrastructure, or other high-volume delivery systems
- Understand queues, workers, retries, idempotency, rate limits, backpressure, and distributed systems
- Experience or strong interest in SMTP, MTAs, DNS, bounces, deferrals, IP pools, and mailbox-provider behavior
- Care about reliability, observability, operational excellence, and reducing blast radius
- Low ego, high ownership, and strong taste for simple systems
- Experience working on applications with a high workload
- Email best practices
- Experienced in Typescript and Golang
Responsibilities
- 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
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