Top Software Engineer Jobs

As a Senior Software Engineer, you will lead user-experience improvements, drive A/B testing, mentor team members, and develop scalable solutions to enhance customer onboarding and success.

Build and maintain internal platforms, web applications, APIs, data/event pipelines, and AI-powered workflows for Klaviyo's demo platform. Own features end-to-end, collaborate with stakeholders, contribute to architecture and operational health, participate in on-call rotations, and use modern AI tools to improve developer productivity and automation. Deliver scalable, observable, and reliable solutions that support sales demos and cross-functional teams.

Lead the Customer Agent AI project at Klaviyo, managing engineering teams, defining technical direction, and driving architectural decisions to develop a conversational AI platform.

As an Engineering Manager for Data Automation, you will lead a team to build and manage data processing systems using various technologies, ensuring high performance and reliability while optimizing workflows.

As a Senior Lead Software Engineer, you will architect and oversee the Developer Infrastructure at Klaviyo, focusing on technical strategy, platform upgrades, dependency management, and enhancing developer productivity while mentoring other engineers.

The Principal Engineer will lead enterprise scalability efforts, driving architectural changes, optimizing systems, and integrating AI for improved operational performance across multi-tenant SaaS platforms.

Design, build, and own highly scalable, highly available messaging infrastructure that processes hundreds of millions to billions of messages daily. Collaborate across teams on architecture, performance, monitoring, and reliability; mentor engineers; improve development and experimentation processes; participate in hiring and technical design.

Design, build, and own features and services for Klaviyo's large-scale messaging platform. Drive performance, scalability, monitoring, and reliability for a pipeline that delivers hundreds of millions to billions of messages. Collaborate across teams, mentor engineers, and participate in hiring and technical process improvements.

Lead technical design and delivery of Klaviyo's messaging pipeline, building scalable backend services (Python/Go), driving architecture, mentoring engineers, collaborating across product, compliance, and platform, and ensuring high-throughput, reliable message delivery at scale.

Lead the Order-to-Cash (O2C) technology track: own roadmap, architecture, CPQ-to-ERP integrations, SOX/ITGC controls, audit readiness, and embed AI-driven automation across finance workflows.