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Senior Front End Platform Engineer


Klaviyo is growing by leaps and bounds; as a result, we’re excited at the opportunity to establish our Frontend Platform Team!
This is a unique opportunity with personal and leadership growth opportunities. You will shape Klaviyo’s frontend and lay the foundation of how an entire company writes, tests, and deploys frontend code. As the team grows, we expect our first senior hires to continue to lead the team and spearhead efforts.
This is the first hire on a brand new team. We require candidates to have extensive experience with React and experience contributing to/owning component libraries.

How you will make a difference:

  • Design, build, and maintain a robust frontend system. This includes developing the patterns on how we write, ship, and test frontend code.
  • Work with a growing design team (~10) and excited engineers (~50) over the tools this team will build.
  • Leading and mentoring the engineering team at large on frontend best practices.

Who You Are:

  • Extensive Frontend Engineering Experience.
  • Experienced with Frontend Tooling (e.g. Webpack, Babel, TypeScript, Eslint, Testing tooling, Jenkins, CDNs, etc.).
  • Experience working in React.
  • Flexible working across teams.
  • Experience developing application APIs (e.g. REST, GraphQL, JSON Schema, or JSON:API, etc.).
  • Have established best practices in how a company writes, tests, and deploys frontend code.
  • Have built or maintained design systems used by other engineering teams.
  • Bring your very best each and every day.
  • Stay positive and keep moving forward.
  • Passion for what you do.

Get to know Klaviyo

Klaviyo is a world-leading marketing automation platform dedicated to accelerating revenue and customer connection for online businesses. Klaviyo makes it easy to store, access, analyze and use transactional and behavioral data to power highly-targeted customer and prospect communications. The company's hybrid customer-data and marketing-platform model allows companies to grow by fostering direct relationships with customers, without giving up their valuable data to popular big-tech ad platforms. Over 265,000 innovative companies like Unilever, Custom Ink, Living Proof and Huckberry sell more with Klaviyo. Learn more at

Klaviyo does not tolerate and prohibits discrimination, harassment or retaliation of or against job applicants, contractors, interns, volunteers or employees by another employee, supervisor, vendor, customer or any third party.

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