Threat Detection Engineer Co-op (Fall 2026)

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.

Detection & Response Engineering Co-op (Fall 2026)

This is a 6-month (July 6th-December 18th, 2026) paid co-op experience out of our Boston, MA headquarters. 

The Secure Intelligence Operations (SIO) team—often referred to as Detection & Response—is responsible for helping Klaviyo mitigate cyber risks. The team focuses on identifying and responding to malicious activity, minimizing impact when security controls fail, and protecting the organization from internal and external threats. The Detection team specifically builds and maintains detective controls to identify suspicious behavior across Klaviyo’s environment.

The Detection & Response Engineering Co-op will support the SIO team by developing, tuning, and testing security detections responding to identified threats. This is a highly hands-on, impactful role that gives students exposure to real-world cybersecurity challenges and defensive engineering work that is not typically available at the entry level.

How you’ll make an impact:

•  Support detection development efforts across the security stack
•  Review, test, and tune detection queries and rules
•  Convert detection queries from Splunk to SQL
•  Participate in threat hunting and threat modeling exercises
• Triage and respond to identified threats
•  Complete project-based work that directly improves Klaviyo’s security posture

Who you are: 

• Currently pursuing an undergraduate degree in Computer Science, Software Engineering, Data Science, or a related field, with an anticipated graduation date between May 2027 and May 2028
• Possess foundational knowledge of Python and are proficient in SQL
• Have a working familiarity with core cybersecurity principles and are eager to apply them in a detection and response setting
• Motivated self-starter who can own projects and work autonomously, while also having strong communication skills and a team-oriented mindset for winning together

We’d love to hear from you if you:

• Have prior hands-on experience utilizing Splunk in a professional or academic environment

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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.