Klaviyo
Security / Reliability EngineerAppliedAug 6, 2026

Stabilize webhook retries without duplicate side effects

Recovery behavior can create a second failure after an upstream service slows down.

The pressure is to preserve events while preventing retries from changing their meaning.

The order happened, but the follow-up is acting like it didn’t know when.

Yen Kittisak · CRM Operations Lead

Oversees automated purchase and replenishment flows for a multi-store beauty brand.

What pulls against what

  • event completeness vs. duplicate side effects
  • provider tolerance vs. internal capacity
  • fast containment vs. durable integrity

What is at stake

Retry storms can turn recoverable provider throttling into late or incorrect lifecycle decisions. The goal is reliable recovery without sacrificing event completeness

Why Klaviyo

At Klaviyo, it can show up as lifecycle decisions drifting from the customer activity merchants expect to use.

Written for

Distributed systems reliability engineerIntegration security engineerOperational resilience practitioner

This is the setup. The work is inside.

Running it puts you in the room: the full situation and its constraints, stakeholders who push back in their own words, and the decisions that are yours to make. What you produce becomes a Day One Plan — work you can show someone instead of describing.