Backend Engineer, MTA

Resend resend.com Open · verified Oct 24, 2026

Remote United States Dublin Full-time Mid-level Backend Engineering

At a glance

Mid-level Backend Engineering role at Resend. Remote, United States · full-time · $150,000–$170,000 base.

SalaryStated by Resend

$150,000 – $170,000

Base salary for this role, in USD per year, as published in the posting.

RoleBackend Engineering

SeniorityMid-level

LocationUnited States

WorkplaceRemote

EmploymentFull-time

Base pay$150,000–$170,000

PostedMay 29, 2026 · 4mo ago

Also hiring inDublin

Role brief

techroles summary, based on the employer's posting.

What you'll do

Build and run the email transport layer, including SMTP delivery, routing, retries and sending controls
Set throttling rules across domains, providers, customers and IPs, then support shared and dedicated IP pools
Improve bounce and failure classification, and build debugging tools that trace delivery by customer, route, IP and event
Turn reputation plans into safer backend systems with Trust & Safety and Core Sending
Respond to delivery incidents and take on-call shifts for critical services

What you bring

Strong backend engineering experience and work on high-volume delivery or communications systems
A solid grasp of queues, workers, retries, idempotency, rate limits, backpressure and distributed systems
Experience with, or strong interest in, SMTP, MTAs, DNS, IP pools and mailbox-provider behavior
You prioritize reliability, visibility into operations and limiting the impact of failures

Who this fits

This role suits a backend engineer who wants ownership of reliable, high-volume sending systems and is comfortable responding to incidents and being on call. It is fully remote across Americas or European time zones, with some travel for off-sites, conferences and meetups.

From the employer

Resend is building the most accessible email platform for developers. As we’ve grown to 4M+ users and continue to onboard thousands of new users every day, the pressure of maintaining a safe place for good senders continues to build.

This role is fully remote-based in Americas or European time zones, with some expected travel for team off-sites, conferences, meetups, and more.

In this role, you will…

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

You will be a great fit if you...

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

You will be an exceptional fit if you also...

Have experience working on applications with a high workload
Know about email best practices, or are willing to learn more about this space
Are experienced in Typescript and Golang