Resend

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backend-engineer

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.

• Build and operate Resend’s email transport infrastructure
• Work on SMTP delivery, MTA systems, routing, retries, backoff strategies, and delivery controls
• Design domain-level, provider-level, customer-level, and IP-level throttling systems
• Build infrastructure for shared IP pools, dedicated IPs, warmup execution, and reputation-aware routing
• Improve classification of bounces, deferrals, transient failures, hard failures, and delivery outcomes
• Build debugging tools for delivery issues by customer, domain, mailbox provider, route, IP, message type, and event
• 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 anti-abuse controls
• Participate in incident response for sending, provider, and deliverability-sensitive issues
• Be on-call for critical services

Backend Engineer

Backend Engineer building Resend’s SMTP and email transport infrastructure. Designing reliable delivery, throttling, routing, and reputation-aware systems for developers.

Resend

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Backend Engineer

Resend