Sr. Lead Software Engineer

Klaviyo·Boston, MA·Posted 16 October 2026

Apply with a tailored CV View on Klaviyo's site

About the role

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Job Title: Sr. Lead Software Engineer Location: Boston, MA This role is based in our Boston hub. We operate a hub‑first model, with regular in‑office collaboration expected. About the Role At Klaviyo, we believe the future of software isn’t just better productivity tools for humans—it’s intelligent systems that can run, optimize, and adapt themselves based on real-time outcome and reward signals. Having already built the infrastructure and applications that connect businesses with over 200,000 customers, billions of consumer profiles, and hundreds of billions of interaction events, we are now making foundational investments in Marketing AI and Service AI to power…

This is a summary of the advert. The full description and the application are on Klaviyo's careers site.

Apply faster with Prepper

A version of your CV tailored to this Sr. Lead Software Engineer role.
A cover letter written from your CV and this advert.
Prepper can fill in Klaviyo's application form and send it once you approve.
The application saved in your tracker, with reminders to follow up.

Start free

More roles at Klaviyo

Prepper is independent and not affiliated with Klaviyo. Roles are listed from the employer's public careers system and removed when they close.