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Senior Software Engineer - Marketing

  • Boston, MA
  • Engineering

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 to see how we empower creators to own their own destiny.

Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at

 We love tackling tough engineering problems and look for Senior and Lead Software Engineers who are passionate about architecting, building, owning & scaling features end to end from scratch and breaking through any obstacle or technical challenge in their way. We push each other to move out of our comfort zone, learn new technologies and work hard to ensure each day is better than the last.

We are looking for a Senior Engineer that will bring deep technical expertise, creative problem solving, and ownership to Klaviyo’s marketing-side tech stack.

Senior Engineers are expected to bring to Klaviyo subject matter expertise and demonstrate adaptability by continuing to acquire and master new skills, level up all those around them, and research and prototype new technologies and solutions to help scale. You’ll contribute to and collaborate with other engineering teams across the organization. 

Technologies we use (not exhaustive):

React, Gatsby, Styled Components, Vanilla JS

Gatsby Cloud, WP Engine, Headless Wordpress (PHP)

How you will make a difference:

  • Develop, scale, and maintain the Marketing site architecture, infrastructure, and tech stack.
  • Craft and maintain It’s your team’s product and you’ll own the code base, technical solutions, and structure that helps us scale, test, explore, innovate, and deliver a stellar on-site experience.
  • Create and maintain the site UI, marketing tools, and content publishing workflows.
  • Consider the needs of not only the users on the site but also our users in marketing who engage with the CMS daily - building and optimizing with both in mind. 
  • Work to create and maintain the reusable modules and components that enable site updates made by the marketing team. 
  • Research and develop unique and engaging content and marketing tools - like interactive ebooks, data visualizations, guides, and other custom interactive experiences for marketing campaigns.
  • Work with the performance marketing team to create a structure that allows for testing, optimization, and accurate site metrics and reporting.
  • Collaborate with digital designers to develop amazing site experiences.
  • Engage across the organization with the various engineering teams to collaborate, explore, communicate challenges, learn, and share knowledge.  

  Who You Are:

  • Passionate and humble - open to new ideas and constructive feedback.
  • Comfortable building and scaling product and website experiences that matter and pushing yourself and your team to be better engineers.
  • Comfortable developing/maintaining a modern (both headless and traditional) CMS powered site
  • Eager to work with both new and existing technologies ranging from the frontend (vanilla JS & React / Gatsby) to backend (PHP) and deployments.  You show this by having solid experience with various technologies and being able to communicate why it's the right (or wrong) tool for any job.
  • Comfortable using SCSS and modular JS systems and using a build system, such as Grunt/Gulp/Yarn.
  • Regularly using APIs.
  • Looking to think through the scale challenges of a website and supporting tooling of a company doubling the number of customers every year.
  • Used to working with web analytics and SEO subject matter experts to measure performance.

Your first 30 days:
We have a robust onboarding support system to guide you through your first few weeks at Klaviyo. You’ll have access to people across the organization and opportunities to learn and get comfortable with our tech stack.

There will be 1:1s with the Marketing Engineering team and with partners in other departments.

You’ll contribute to both planning sessions and hands-on work. Code reviews and PRs are a positive, supportive and daily interaction on our team.

Your first 60 days:
You’ll be providing context through your lens of experience and technical knowledge for upcoming projects. Working with the Engineering Manager to craft and hone a medium and long term roadmap together. 

You’ll be very active in code reviews and hands-on with high-level or more abstract engineering tasks and architectural decisions.

Your first 6 months:
Together with your manager you’ll have a set of goals crafted and mapped to achievable milestones. These will tie back to both business and personal growth, we’re always learning here. 

You’ll own large scale projects as the technical resource, working closely with stakeholders and the Marketing Engineering team to meet agreed upon deadlines. 

You’ll work with an eye toward developing the technical growth of the entire team, pushing us all to learn and find the right solutions to problems.

You’ll identify opportunities for our technical systems, processes, automations, and generally own the technical roadmap for the team.

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 .

If you are a Colorado or New York City resident and this role is a remote role, you can receive additional information about the compensation and benefits for this role, which we will provide upon request. Requests can be submitted here . Additional information regarding benefits can be found here .

Klaviyo is committed to diversity and to a policy of equal employment opportunity and non-discrimination. We do not discriminate on the basis of race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, gender identity, sexual orientation or any other characteristic protected by applicable law.

Apply now