Deliverability Engineer, Core Sending

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 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.

You will be a great fit if you...

• Have experience in email deliverability, reputation, mail operations, anti-abuse, or high-volume email systems

• Understand IP reputation, domain reputation, authentication, bounces, complaints, suppressions, and warmup

• Know how major mailbox providers behave and how to diagnose provider-specific delivery issues

• Can turn ambiguous deliverability judgment into metrics, policies, runbooks, dashboards, and systems

• Communicate clearly with engineering, support, product, customers

• Have low ego, strong judgment, and high ownership

You will be an exceptional fit if you also...

• Have operated shared and dedicated IP pools

• Have designed or managed IP warmup programs

• Have recovered from provider blocks, spam-foldering issues, complaint spikes, deferral spikes, or blocklist events

• Have experience with Google Postmaster Tools, Microsoft SNDS/JMRP, Yahoo Sender Hub, feedback loops, or blocklist monitoring

• Understand DKIM, SPF, DMARC, PTR, TLS, DSNs, List-Unsubscribe, suppression, and bounce classification

• Understand IP reputation, domain reputation, authentication, bounces, complaints, suppressions, and warmup

• Have partnered with Trust & Safety, anti-abuse, support, or customer-facing teams

• Have helped build deliverability dashboards, reputation scoring, traffic segmentation, or automated enforcement systems

• Have experience helping engineering teams turn deliverability knowledge into product and infrastructure

What it means to join the team: