Backend Engineer, MTA

Resend

United States

Remote

USD 150,000 - 170,000

Full time

3 days ago

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Benefits offered by this job

100% remote team

Flexible schedules

Modern tech stack

Job summary

Resend is building the modern email platform for developers, with a fully remote team spanning Americas and Europe.

As a backend engineer, you will own delivery systems, work with Typescript and Golang, and help make sending safer and more observable. This role offers a 100% remote setup and flexible schedules while leveraging a modern stack (TS, AWS, Go, Postgres, Datadog).

Qualifications

Backend experience in high-volume delivery systems.
Experience with SMTP, MTAs, DNS, or related mail delivery.
Strong knowledge of distributed systems and reliability.
Willingness to learn about email best practices.

Responsibilities

Build and operate Resend’s email transport infrastructure.
Work on SMTP delivery, MTA systems, routing, retries.
Design throttling systems at domain/provider/IP level.
Build infrastructure for shared IP pools, warmup, and reputation-aware routing.
Improve classification of bounces, deferrals, and delivery outcomes.
Develop debugging tools by customer, domain, provider, route, IP, and event.
Participate in incident response and be on-call for critical services.

Skills

Backend engineering

Email delivery systems

Queues & retries

SMTP & MTAs

Reliability & observability

Ownership & simplicity

Typescript

Golang

Tools

AWS

Postgres

Datadog

Job description

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.

Read more about how we work, how we hire, and what we value here.

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

What it means to join the team: