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Senior Software Engineer - Profile Subscriptions

  • 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

Klaviyo operates a real-time data platform written in Python and built for massive scale on Amazon Web Services (AWS). Engineers come to Klaviyo with experience in a variety of languages and from a number of disciplines. We love tackling tough engineering problems and look for Engineers who are passionate about building, owning, and scaling features 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. 

Team Overview

The Profile Subscription Team is responsible for one of the most foundational product areas in Klaviyo, managing customer marketing subscriptions. We own real-time processing for millions of email, SMS, and mobile push marketing subscriptions every day as well as managing over 15 billion consent records across all time.

As an engineer on this team, you will be responsible for designing, building, and maintaining systems to support two core product areas in Klaviyo. You will work with a cross functional team to help refine feature specifications, write technical design documents, create system infrastructure, write high quality code, and operate large scale systems in production. You will also review other engineer’s designs and code, and provide technical mentorship to other engineers on the team and in the broader engineering organization.

Team Tech Stack

  • Python
  • Django
  • React
  • MySQL
  • ProxySQL
  • Redis
  • Memcached
  • RabbitMQ
  • Kafka

Required Skills

  • Highly skilled in using at least one modern programming language
  • 5+ years of experience in a software engineering discipline
  • Significant experience with full stack application development
  • Able to communicate well
  • Able to work with others on a team
  • Able to learn continuously and adapt to a high growth environment
  • Able to stick with and solve difficult problems

Preferred Skills

  • Experience with distributed systems
  • Experience performance tuning and scaling systems
  • Experience with SQL databases (either MySQL or PostgreSQL)
    • schema design
    • normalization / denormalization trade-offs
    • performance
    • operations
  • Experience using Linux operating systems
  • Experience with high volume data processing and storage systems

**Please note that this role is located in Boston and not open to remote

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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