Backend Engineer, MTA

About the role

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 https://resend.com/handbook.

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:

- 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

ABOUT RESEND