---
title: "Welcoming Kiersti Esparza, our new Deliverability Engineer"
description: "Resend introduces Kiersti Esparza as a Deliverability Engineer on its Trust & Safety Squad, where she will help scale sending infrastructure as the company grows. She brings nearly 20 years in email deliverability, including building teams at Marketo, consulting at Twilio, and deliverability engineering at Klaviyo. Esparza describes the work as a combination of interpreting datasets, understanding email technology, and adapting to evolving authentication in an ongoing contest between bad actors and receivers. She says Resend attracted her with developer-oriented infrastructure, hands-on foundational work, and a culture centered on transparency and partnership, while advising operators to master overlooked infrastructure because its scarcity creates leverage."
---

# Welcoming Kiersti Esparza, our new Deliverability Engineer

[Resend](https://yomu.fyi/company/resend) · Sep 3, 2026

**Type:** Announcement

## Summary

Resend introduces Kiersti Esparza as a Deliverability Engineer on its Trust & Safety Squad, where she will help scale sending infrastructure as the company grows. She brings nearly 20 years in email deliverability, including building teams at Marketo, consulting at Twilio, and deliverability engineering at Klaviyo. Esparza describes the work as a combination of interpreting datasets, understanding email technology, and adapting to evolving authentication in an ongoing contest between bad actors and receivers. She says Resend attracted her with developer-oriented infrastructure, hands-on foundational work, and a culture centered on transparency and partnership, while advising operators to master overlooked infrastructure because its scarcity creates leverage.

## Context

Kiersti Esparza joins Resend’s Trust & Safety Squad as a Deliverability Engineer. Her background spans Marketo, Twilio, and Klaviyo, with nearly 20 years focused on email deliverability.

## Approach / What changed

Resend is adding Esparza to help scale its sending infrastructure. She will work hands-on as an individual contributor alongside the team building the stack from scratch.

## Takeaways

- Email deliverability requires combining multiple datasets with an understanding of the underlying email technology to diagnose what happens when delivery problems occur.
- Authentication and related technology keep evolving because deliverability involves an arms race between bad actors and receivers.
- Esparza advises operators to specialize in overlooked infrastructure, arguing that scarce ownership of unglamorous problems creates leverage.

## FAQ

### What experience does Kiersti Esparza bring to the role?

Esparza has nearly 20 years of experience in email deliverability. She built deliverability teams at Marketo, ran consulting at Twilio, and most recently worked in deliverability engineering at Klaviyo.

### Why did Esparza choose Resend?

She wanted to work on sending infrastructure designed with developers in mind and suited to the pace of change in technology. The chance to build foundational systems at scale as a hands-on individual contributor, along with the team’s transparency and partnership, also appealed to her.

### What advice does Esparza give ambitious operators?

She recommends learning the parts of the stack that attract little competition, especially boring infrastructure that receives attention mainly when it fails. Becoming the person who understands a quietly worrying problem best can create leverage.

**Tags:** [Deliverability](https://yomu.fyi/topic/deliverability), [Email](https://yomu.fyi/topic/email)

- Source: [Resend](https://resend.com/blog/welcoming-kiersti-esparza)
- Source URL: https://resend.com/blog/welcoming-kiersti-esparza
- Ingested by Yomu: 2026-09-19T09:54:39.891Z

[Read original post](https://resend.com/blog/welcoming-kiersti-esparza)