Security Engineer Co-op

Boston, MA

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.

Security Engineer Co-op (Fall 2025)

Location: Boston, MA 

This is a 6-month (July 13th - December 19th, 2025) paid co-op experience out of our Boston, MA headquarters. 

Our Security Engineering team is looking for a co-op student is designed to provide each co-op with a meaningful and robust experience that impacts our fellow Klaviyos’ experience. Co-ops dive into substantial projects with concrete goals and objectives that allow plenty of room for exploration and problem solving. We offer a supportive environment where interns can test, fail, iterate and launch while building a solid career foundation, awesome connections across Klaviyo, and have fun.

How you will make an impact:

  • Develop internal security tooling in support of Security Operations mission
  • Build integrations and automate Security Operations workflows 
  • Contribute to establishing telemetry data across Klaviyo cloud environments, platforms, and technologies
  • Work on big data problems to help identify cyber threats
  • Create heuristics and statistical models to find security anomalies 
  • Ship code in an agile fashion, pairing with various Security Operations or Engineering Teams to craft better software by soliciting feedback
  • Work on a cloud first product, learning about scalable platforms and applying those skills in our production security environment
  • Help the entire company understand security best practices

Who you are:

  • Undergraduate with a target graduation date between December 2025 - June 2026 with a BA/BS in Computer Science, Engineering or similar field
  • Have at least one previous internship or co-op experience in Information Security or Security Engineering
  • A passion for building security tools and products that matter 
  • Enjoy working with new technologies ranging from the frontend to backend, and are particularly passionate in multiple stack areas. You show this by having exposure to various technologies and have good instincts to pick the right tool for any job
  • Love digging into performance and scalability issues to drive breakthrough solutions-- whether it's a slow loading UI or too many clicks in a workflow, a database query timing out, or a queue that just won’t drain. You recognize all problems can be solved

If you’re curious, here are some of  the technologies we use (not exhaustive). While we don’t expect interns to have experience with all of these, you may get exposure to them during your co-op with us: Python, Django, Celery, MySQL, Cassandra, RabbitMQ, Redis, HTML, JavaScript, LESS, Backbone.js, React, Amazon Web Services (EC2, RDS, Aurora, etc.) Terraform, Ansible, Packer, and other DevOps tools

Compensation:

$48.50 USD per hour

Why co-op with Klaviyo?

  • Set up for Success: Before diving into individual teams and projects, all co-ops will complete Base Camp - Klaviyo’s week-long onboarding experience at our Boston HQ.  Base Camp provides focused time to learn about the ins and outs of Klaviyo, our product, and to get to know other co-ops. This robust first week ensures all co-ops join their teams fully prepared to dive into project work and make an immediate impact. 
  • Co-ops make an Impact: Our co-ops contribute to mission-critical projects for Klaviyo. No matter what team you join, you’ll be making a direct impact on our product and/or customers.
  • Our Boston Office is fun!: Co-ops stay fueled with free snacks and drinks, take breaks with each other over a game of ping pong or a round of golf in our simulator, and relax in our speakeasy (yes you read that right!).

Get to Know Klaviyo

We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us.

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.

IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. You can find our Job Applicant Privacy Notice here.
 
By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.  If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here.

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At Klaviyo, we strive to make the world more equitable - it's one of our core values. Klaviyos (our employees) believe that everyone deserves a fair shot at success. We strive to be a diverse company, where we seek opinions and experiences different from our own. Individuals seeking employment at Klaviyo are considered without regard to 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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