Software Engineer Intern (Summer 2027)

Klaviyo builds scalable, high-performance systems that power its products and infrastructure for customers worldwide. The Software Engineer Intern will join an engineering team, develop and ship production features, solve technical problems, and gain experience across the full software development lifecycle while using AI tools to improve productivity.

What you'll do:

• Own features that our 180K+ paying customers rely on daily to reach their consumers and grow their business
• Take responsibility for the mission, technical direction, and operation of projects with immediate impact
• Own the full lifecycle of your code: writing it, testing it, shipping it, and making it better over time. Ownership is expected here, not just encouraged
• Build and ship features that meet a high bar and grow your technical skills while you do it
• Get hands-on debugging real issues, both locally and in production
• Contribute to documentation and support your team during incidents (real-world problems teach you things a tutorial never will)
• Work closely with your teammates: ask questions, share ideas, and get better by taking feedback seriously
• Learn to use the right tool for the job, lean into AI, and keep looking for ways to make things better
• Put AI at the center of how you work to move faster. Build smarter systems and better workflows from the ground up

What they're looking for:

• At least one previous software engineering internship or co-op, with hands-on software development experience
• Currently pursuing a degree in Computer Science, Engineering, Data Science, Math/Statistics, or a related field
• Graduating in December 2027 or May/June 2028
• Experience with some of these technologies and languages:
• Python, Django, Typescript, React, Go
• MySQL, Cassandra, Clickhouse, Kafka, Redis
• Amazon Web Services (EC2, RDS, Aurora, etc.), Terraform
• You enjoy working across new technologies and you're excited  to work across the stack from back-end to front-end work
• You love digging into performance and scalability issues to find breakthrough solutions: a slow-loading UI, too many clicks in a workflow, a database query timing out, a queue that won't drain. You believe every problem can be solved, and you'd rather run toward it than around it
• You enjoy shipping code early and often, working closely with products to build better software based on feedback from thousands of end users
• You embrace Klaviyo's "always learning" culture. We learn faster together, which is part of why this program happens in person
• You've already experimented with AI in work or personal projects, and you're excited to find ways to make your work smarter and more efficient

Benefits:

• 11-week paid Summer Internship Program at the Boston, MA headquarters
• Lunch is on us 5 days a week
• Free snacks and drinks
• Ping pong, Nintendo Switch, a golf simulator, and a speakeasy to unwind in
• Social events including a Red Sox game, a Boston Harbor Cruise, trips to Kings and Versus, ice cream socials, and Ask Me Anything sessions with Klaviyo's senior leadership
• Klaviyo Base Camp onboarding experience to get interns up to speed on Klaviyo, its product, and the day-to-day of engineering
• Participation in the company’s annual cash bonus plan may be included in the total compensation package
• Equity may be included in the total compensation package
• Sign-on payments may be included in the total compensation package
• A comprehensive range of health, welfare, and wellbeing benefits based on eligibility