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Backend Engineer, MTA

Resend· Engineering
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Remote$150k - $170kFull-timePosted yesterday

About the role

Backend engineer role focused on building and operating Resend’s email transport infrastructure, with emphasis on SMTP delivery, MTA systems, throttling, delivery outcomes, observability, and safe sending practices in a fully remote setting.

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 and Core Sending 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

Qualifications

  • 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

Skills

Required:Backend engineeringTypeScriptGo (Golang)SMTP/MTAsDistributed systemsObservability and reliabilityOn-call / incident response

Benefits

  • Autonomy to "just ship it"
  • 100% remote team with flexible working schedules
  • Modern tech stack (Typescript, AWS, Go, Postgres, Datadog)
  • Honest and low-ego team
  • Ownership of problems and solutions
  • Comp: $150,000 - $170,000 USD, commensurate with location and experience
Last updated Oct 25, 2026. Interested? Apply on the company site.
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About Resend

Email for developers

Resend is the new email API for developers. It's designed for you to build, test, and send transactional emails at scale. If you're using Sendgrid, AWS SES, or Postmark, come talk to us.

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