Backend Engineer (MTA), Trust & Safety

About this 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.In this role, you will…Build and operate Resend’s email transport infrastructureWork on SMTP delivery, MTA systems, routing, retries, backoff strategies, and delivery controlsDesign systems for domain-level, provider-level, customer-level, and IP-level throttlingBuild infrastructure for shared IP pools, dedicated IPs, warmup execution, and reputation-aware routingImprove how Resend classifies bounces, deferrals, transient failures, hard failures, and delivery outcomesBuild tools that help the team debug delivery issues by customer, domain, mailbox provider, route, IP, message type, and eventHelp design systems that make sending behavior safer, more observable, and easier to operateTranslate reputation strategy into backend systemsPartner with Trust & Safety and Core Sending to build controls that protect Resend’s sending network from abuseParticipate in incident response for sending, provider, and deliverability-sensitive issuesBe on-call for critical servicesYou will be a great fit if you...Have strong backend engineering experienceHave worked on email, messaging, notifications, communications, infrastructure, or other high-volume delivery systemsUnderstand queues, workers, retries, idempotency, rate limits, backpressure, and distributed systemsHave experience or strong interest in SMTP, MTAs, DNS, bounces, deferrals, DNS, IP pools, and mailbox-provider behaviorCare about reliability, observability, operational excellence, and reducing blast radiusHave low ego, high ownership, and strong taste for simple systemsYou will be an exceptional fit if you also...Have experience working on applications with a high workloadKnow about email best practices, or are willing to learn more about this spaceAre experienced in Typescript and GolangWhat it means to join the team:Autonomy to "just ship it"100% remote team with flexible working schedulesModern tech stack (Typescript, AWS, Go, Postgres, Datadog)Honest and low-ego teamOwnership of problems and solutionsComp: $150,000 - $170,000 USD, commensurate with experienceAbout ResendWe 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. Meet the humans →