Why You Should Join the Editors Team: The Editors Platform team is responsible for building common reusable components for the message editor. This team powers all the editors at Klaviyo. This team focuses on building intuitive and powerful interfaces to create highly customizable and dynamic content ranging from product feeds, real time event data, and more. This product area is core to Klaviyo’s continued success. As a Senior Software Engineer on the team, you’ll play a key role in designing and building scalable systems that power our editor experiences across all the editors. Partnering closely with product managers and technical product owners, you’ll help define scope, translate ideas into practical implementations, and build intuitive editing tools that delight our users. This role leans frontend, with a strong focus on crafting thoughtful, reusable components and seamless user experiences using technologies like TypeScript, React, Python, and Django. There are ample opportunities for growth given the scope of this role and the team’s central role in Klaviyo’s product. Over the past year, our team has enhanced the editor interfaces with impactful features that our customers love—and they’re eager to see that same power brought to other mobile experiences. Looking ahead, we’ll be investing in new editor blocks, a personalization builder, in-canvas editing, and content generation powered by AI. You’ll contribute directly to these efforts, helping Klaviyo extend its best-in-class editing tools across platforms. How You Will Make a Difference: You will be a core member of the Editors platform 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. Who You Are: Experienced in full-stack development with strong hands-on skills in React, Redux, JavaScript, HTML, and CSS, along with familiarity with general web best practices. Proficient in Python and Django (or similar backend technologies), and comfortable working across large codebases and multiple layers of the stack. Familiar with automated testing practices and frameworks, including end-to-end and integration tests (e.g., 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. You know when to reach for tools like queues, caches, CDNs, and web workers to solve performance and scaling challenges. Collaborative, communicative, and eager to learn and share knowledge. Technologies We Use (not exhaustive): React, TypeScript, Redux Python, Django MySQL, RabbitMQ, Redis, ProxySQL Amazon Web Services (EC2, RDS, Aurora, etc.), Terraform, and other DevOps tools

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