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Backend Engineer (MTA), Core Sending

Resend
Backend Developer • Remote • Full-time • 📍 Remote (US)
📄 View original listing (EN)

Resend, used by over 2 million developers, hires a backend engineer for its Core Sending Squad, responsible for the core components that send transactional and marketing emails. The role builds and operates Resend's email transport infrastructure. Fully remote in Americas or European time zones, with some expected travel. Comp: $150,000 - $170,000 USD, commensurate with experience.

Stack

AWSGoPostgreSQLTypeScript

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 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

Requirements

  • ▹Strong backend engineering experience
  • ▹Experience working on email, messaging, notifications, communications, infrastructure, or other high-volume delivery systems
  • ▹Understanding of 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

Nice to have

  • ▹Experience working on applications with a high workload
  • ▹Knowledge of email best practices, or willingness to learn more about this space
  • ▹Experience in TypeScript and Golang

Soft skills

Low ego, high ownershipStrong taste for simple systems

What we offer

  • ▹Comp: $150,000 - $170,000 USD, commensurate with experience
  • ▹100% remote team with flexible working schedules
  • ▹Modern tech stack (TypeScript, AWS, Go, Postgres, Datadog)
  • ▹Autonomy to just ship it; ownership of problems and solutions