Resend
Backend Engineer (MTA), Core Sending
1mo ago
MiddleRemotesmtpmtainfrastructureroutingsystem design
Responsible for building and maintaining core backend components for transactional and marketing email delivery infrastructure.
Responsibilities
- 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 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
Other
- Resend is growing fast, and there are now over 2 million developers using it. As the Core Sending Squad, we are responsible for building and maintaining the core components of Resend that handle sending transactional and marketing emails.
- 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 .
- 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
- 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
- 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 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 45 spans 13 countries and counting. We're backed by a16z, Y Combinator, and others. Meet the humans →