Klaviyo Tech Stack

AI-powered CRM platform for B2C ecommerce marketing automation and customer engagement

Marketing Services Boston, Massachusetts 1,001–5,000 employees Founded 2012 Public Company

Klaviyo is a public B2C CRM built around marketing automation, analytics, and customer service — now doubling down on AI-driven workflow transformation and LLM integration (OpenAI, Anthropic, AWS Bedrock). The stack is heavy on Python, Go, Kafka-adjacent infrastructure (Apache Pulsar), and big-data processing (Spark, Hadoop), with active work on scalable ML feature pipelines and enterprise-grade security controls. Hiring velocity is accelerating across engineering and sales, signaling both product expansion and GTM scaling to address enterprise adoption barriers.

Tech Stack 148 technologies

Core StackPython Go AWS Kubernetes JavaScript React Angular Figma Sketch Adobe Creative Cloud NetSuite Workday GitHub Asana Jira Smartsheet FastAPI Django Apache Spark Hadoop HTML CSS Web Components Git Coupa ChatGPT Claude Gemini Linear Apache Pulsar+114 more

AdoptingOpenAI Anthropic OpenTelemetry Salesforce Commerce Cloud AWS Bedrock Chrome

What Klaviyo Is Building

◆Challenges

Transforming workflows with ai
Automating detection and response operations
Optimizing query performance
Reducing risk
Increasing email and sms revenue
Improving system reliability
Scaling platform for enterprise customers
Driving integration adoption
Scaling data pipelines
Scaling ai solutions for 167k customers

▲Active Projects

Ai-driven workflow transformation
Transform workflows with ai
Data pipeline development
Foundational services
Public chrome extension for troubleshooting api calls
Integration specifications for non-standard ecommerce platforms
Scalable security controls
Technology partner sponsorship strategy for flagship events
Build smarter systems
Threat modeling and risk assessments

Hiring Activity

Accelerating370 roles · 180 in 30d

Department

Engineering

101

Sales

Marketing

Support

Product

Security

Data

Finance

Seniority

Senior

157

Mid

Lead

Manager

Junior

Director

Principal

Notable leadership hires: Web Growth Lead, Integrated Marketing Lead, GTM Transformation Lead, Finance Director, Digital Director

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About Klaviyo

Klaviyo serves B2C brands with a unified marketing platform combining CRM, marketing automation, and analytics. The product operates at scale: over 176,000 brands use it to deliver 1:1 personalization and drive revenue. The engineering architecture spans full-stack web (React, Angular), backend services (Python, FastAPI, Django), real-time data pipelines (Pulsar), and distributed processing (Spark, Hadoop) — infrastructure built for high-throughput customer data and messaging at enterprise volume. Recent hiring focus on security, data, and AI signals a shift toward compliance-heavy enterprise deals and LLM-native workflows.

HeadquartersBoston, Massachusetts

Company Size1,001–5,000 employees

Founded2012

Hiring MarketsIreland, United States, Germany, Australia, United Kingdom, Singapore, France

Frequently Asked Questions

What tech stack does Klaviyo use?

Python, Go, Kubernetes, React, Angular, FastAPI, Django, Apache Pulsar, Spark, Hadoop, AWS, and AWS Bedrock. Adopting Salesforce Commerce Cloud, OpenAI, and Anthropic.

What is Klaviyo working on?

AI-driven workflow transformation, data pipeline scaling, security controls, API troubleshooting tools (Chrome extension), ecommerce platform integrations, and infrastructure to support enterprise customers at scale.