Backend Engineer, Core Sending

🕒 May 29

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Resend

WebsiteLinkedInAll Job Openings

1 - 10 employees

Founded 2022

☁️ SaaS

🔌 API

🤝 B2B

💰 $3M Seed Round on 2023-07

SaaS • API • B2B

Resend is a developer-focused email platform designed to deliver transactional and marketing emails at scale. Its simple and elegant interface, along with SDKs for various programming languages, allows for seamless integration into developers' workflows. Companies of all sizes trust Resend for reliable email delivery, helping them reach humans instead of spam folders. The platform offers features like modular webhooks, contact management, broadcast analytics, and a powerful editor for creating beautiful email templates using React. Resend also provides insights into email interactions, secure domain authentication, and dedicated IP management to enhance deliverability.

📋 Description

• 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

🎯 Requirements

• 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 (Exceptional fit) • Know about email best practices, or are willing to learn more about this space (Exceptional fit) • Are experienced in Typescript and Golang (Exceptional fit)

🏖️ Benefits

• 100% remote team with flexible working schedules • Autonomy to "just ship it" • Ownership of problems and solutions • Modern tech stack (Typescript, AWS, Go, Postgres, Datadog)