Software Engineer II - API

Klaviyo(26 days ago)

HybridFull TimeMedior$120,000 - $180,000Engineering

About this role

Klaviyo is hiring on its API team to build and evolve public and internal API platforms and related infrastructure. The role focuses on improving developer experience, platform reliability, and scalability to support product teams. This position is based in the Boston office and expects team members onsite at least three days per week.

View Original Listing

Required Skills

Python
Django
FastAPI
RESTful APIs
Microservices
Monolithic Architecture
CI/CD
Debugging
Performance Optimization
MySQL

+11 more

About Klaviyo

klaviyo.com

Klaviyo is a B2C CRM and marketing automation platform that unifies AI-powered email and SMS to help ecommerce brands drive growth and retention. It uses customer data, advanced segmentation, and automation flows to deliver personalized, omnichannel experiences across email, SMS, WhatsApp, and more — including AI-driven capabilities via K:AI Agents. Klaviyo emphasizes measurable results with analytics, testing, and integrations with major ecommerce platforms to boost revenue and lifetime value. Companies use it to build targeted lifecycle campaigns, personalized messaging, and data-driven retention strategies at scale.