Senior Software Engineer - Profiles, Lists and Segments

Klaviyo is a company that empowers creators to own their destiny by making first-party data accessible and actionable. They are seeking a Senior Software Engineer to design and build scalable systems for managing customer data, focusing on creating intuitive workflows and enhancing user experiences.

Responsibilities:

• You will be a core member of the PLS team, working on impactful customer-facing features that will make our product the best in the industry
• You will work on creating easy-to-use editors that are highly performant
• You will work closely with Product, Design, and Data Science to provide the best experience for our customers
• You will mentor team members and drive initiatives that help the team learn new skills

Requirements:

• 5+ years of experience in full-stack development with strong hands-on skills in React, Redux, JavaScript, HTML, and CSS, along with familiarity with general web best practices
• Has a track record of delivering and shipping work powered by or accelerated through AI
• Experience conducting code reviews and running a robust testing cycle using automated testing practices and frameworks, including end-to-end and integration tests (e.g., cypress, pytest)
• Experienced with RESTful and GraphQL APIs, and evolving APIs and data models to support product success
• You take ownership of your work—from requirements and edge cases to implementation and testing—and are motivated by solving tough problems with others
• Proven track record of leading complex, multi-quarter projects involving cross-team collaboration and being accountable for their outcomes