Backend Engineer, MTA

Resend

Responsibilities

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

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

Build and operate Resend’s email transport infrastructure

You will be a great fit if you...

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

Comp: $150,000 - $170,000 USD, commensurate with location and experience

We are building the modern email sending platform for developers. We care deeply about quality, craft, and the developer experience.
Our fully remote team of 50 spans 15 countries and counting. We're backed by a16z, Y Combinator, and others.
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