Software Engineer II - Custom Objects

Software Engineer II – Custom Objects Platform

Background

Klaviyo operates a real-time data platform built for massive scale, powering segmentation, automation, analytics, and personalization for hundreds of thousands of customers. At the core of this platform are three foundational data entities : Profiles , Events , and Objects .

The Custom Objects team owns the platform that allows customers to define, store, and evolve their own domain-specific data models — enabling richer personalization, advanced segmentation, and flexible analytics beyond Klaviyo’s built-in data types.

As a Software Engineer II on the Custom Objects team, you’ll help build and scale the systems that allow customers to safely model, query, and activate their custom data at scale.

How You’ll Make an Impact

Custom Objects unlock how customers represent their business inside Klaviyo.

In this role, you’ll :

• Build systems that support customer-defined schemas and flexible data models
• Enable other teams (Flows, Segmentation, Analytics, AI) to safely rely on object data
• Work on platform primitives that must balance flexibility, correctness, performance, and cost
• Contribute to a core data surface that directly impacts customer experience and product velocity

What You Will Do

What We’re Looking For

Required Qualifications

Nice to Have

What Success Looks Like

In the First 90 Days

Over the First Year

Why This Role Is Unique

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