Klaviyo
Senior Software Engineer - Profiles, Lists and Segments
$148K–$222K
Boston, MA +1 · Senior · Full-time · Posted Jan 22, 2026
- Location
- Boston, MA
Boston, Massachusetts, United States - Experience
- 5+ years of full-stack development experience.
About the job
Designs and builds scalable, customer-facing systems and workflows for managing profiles, lists, and real-time audience segments.
What you'll do
- Build performant, easy-to-use editors and reusable frontend experiences.
- Partner with Product, Design, and Data Science to deliver customer-facing features.
- Lead cross-team initiatives and projects, mentor teammates, and support team learning.
What they ask for
- Strong hands-on skills in React, Redux, JavaScript, HTML, and CSS, with familiarity with web best practices.
- Experience with code reviews and automated testing, including end-to-end and integration tests.
- Experience with RESTful and GraphQL APIs and evolving APIs and data models.
- Track record of delivering work powered or accelerated through AI and leading complex, multi-quarter cross-team projects.
Pay
$148,000 — $222,000 USD base salary
Tools
React, TypeScript, Redux, JavaScript, HTML, CSS, Python, Django
AI focus
Deliver and ship work powered or accelerated through AI; Klaviyo also emphasizes responsible AI use, including privacy, security, bias awareness, and human-in-the-loop.
Model-written summary · the original posting is authoritative