Security Engineer Co-op

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.

This is a 6-month (January 4th - June 26th, 2026) paid co-op experience out of our Boston, MA headquarters. 

Our Security Engineering team is looking for a student to join as a Security Engineering Co-op. The co-op program at Klaviyo is designed to provide each student with a meaningful and robust experience that impacts our fellow Klaviyos’ experience. 

Security Engineering Co-ops dive into substantial projects with concrete goals and objectives that allow plenty of room for exploration and problem solving. You will get exposure to a wide range of tasks involving front-end and back-end engineering. We offer a supportive environment where students 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
• Experiment with and incorporate AI technologies into development practices
• 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 2026 - May 2028 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

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.

Please see the independent bias audit report covering our use of Covey here

Massachusetts Applicants:
It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location.

In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Please visit Klaviyo Rewards to find out more about our Total Rewards package.

Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.

Base Pay Range For US Locations:$49—$49 USD

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.

AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. 

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.