Backend Engineer, MTA

Remote, Europe +1·Full-time·Added 2 days ago

Resend

4 open roles

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Overview

Job details

US$150,000 - US$170,000 a year
Gross, as stated in the ad.
Full-time hours
Per the ad.
Fully remote
Only from certain places, per the ad: “This role is fully remote-based in Americas or European time zones”

Requirements

Have the right to work in Spain
Resend doesn't mention sponsorship, but this role may fit the Digital nomad visa.
Work in English
English is required, per the ad.

Requirements

What we're looking for

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

Nice to have

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

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.

What you'll do

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

How you'll work

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

About Resend

Resend is a developer platform that provides a modern email API for sending, receiving, and managing transactional emails. The company offers a developer-friendly alternative to legacy email services like SendGrid, with a focus on reliability, deliverability, and a clean, well-documented interface. Resend is a relatively small but fast-growing company in the developer tools space, serving startups and larger engineering teams that need programmatic email capabilities.

Resend has a small presence in Spain, with remote-friendly roles open to international candidates. The company's culture is deeply engineering-driven, with a strong emphasis on product quality and developer experience. For international professionals, Resend offers the opportunity to work in a fast-paced, high-autonomy startup environment, with a globally distributed team and a focus on asynchronous communication.

Founded: 2023
Employees: 11–50
Headquarters: San Francisco, USA
Website: resend.com

Good to know if you are moving

Remote-first company: Resend operates as a fully distributed team, so most roles, including those based in Spain, are remote-friendly.
Young, fast-moving startup: Employees get high autonomy and direct impact on the product, which is attractive for those seeking a dynamic environment.
Modern tech stack: The company uses current technologies (e.g., TypeScript, React, AWS) and encourages continuous learning.
Global team: Working at Resend means collaborating with colleagues across different time zones, offering a global perspective.
Product-focused roles: Open roles in Spain are primarily in engineering and design, directly building the core product.