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Lead Software Engineer

  • 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.

Team Overview: 

The Integrations, Enrichment team is responsible for building and maintaining Klaviyo’s integrations to a multitude of 3rd party vendors. These vendors can be grouped across a number of verticals ranging from e-commerce to help desk to payment processing. In order to enable our customers to integrate with these different vendors we provide easy-to-use interfaces that guide our customers through the setup and management of an integration. Behind the scenes, we use a variety of different pipelines to process data flowing to and from the vendor at scale.


This is a newly formed team, so incoming members will be responsible for building the foundation of the developer experience at Klaviyo. You will have an opportunity to make a major impact on the direction and priorities of the team.

As an engineer on this team, you will be responsible for building and managing Klaviyo’s integration settings pages, API services that communicate with 3rd-party vendor APIs, data transformation of data flowing between Klaviyo and the 3rd-party vendor, as well as wiring up the API Services into a number of data pipelines. These pipelines range from webhook processing to periodic data syncs to syncing data back to the vendor. Additional responsibilities include providing quality PR reviews for our code-owned areas of the application, participating in architectural design decisions, collaborating with product owners and providing technical expertise on upcoming Product Specifications, and acting in a project lead capacity to make sure that work is well-defined, estimated, and planned accordingly.

Team Tech Stack:

  • Python, 
  • Django REST Framework, Django
  • React, React Query
  • MySQL
  • Redis
  • Memcached
  • RabbitMQ / Celery

Required Skills: 

  • 7+ years of experience in a software engineering discipline
  • Significant experience with full stack application development
  • Experience working with both monolithic and microservices architectures
  • Experience with CI/CD pipelines
  • Experience debugging performance issues and improving application performance

Preferred Skills:

  • Experience working with Service Oriented Architecture (preferably in Python)
  • Experience working with RESTful applications/APIs
  • Experience with mentoring junior developers
  • Experience with highly available, scaling systems.

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 California, Colorado, Rhode Island, Washington, New York City, or Jersey 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 at .

      • Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.


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