Software Engineer Co-op (Spring 2027)

Klaviyo is an AI-first company whose engineering teams build scalable, high-performance systems that power its products and infrastructure. The Software Engineer Co-op will work on an engineering team, own features and projects end-to-end, solve technical problems, ship production code, and use AI tools to improve development and workflows.

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:

• The Spring Co-op Program is a paid experience [January 4–June 25]
• Before joining individual teams, all co-ops go through Klaviyo Base Camp, our onboarding experience built to get you up to speed on Klaviyo, our product, and the day-to-day of engineering here.
• Lunch is on us 5 days a week, along with free snacks and drinks
• Social events beyond team and project work: a Red Sox game, trips to Versus and Activate, ice cream socials, and Ask Me Anything sessions with Klaviyo's senior leadership
• Participation in the company’s annual cash bonus plan may be included in the total compensation package, based on eligibility
• Variable compensation (OTE) for sales and customer success roles may be included in the total compensation package, based on eligibility
• Equity may be included in the total compensation package, based on eligibility
• Sign-on payments may be included in the total compensation package, based on eligibility
• A comprehensive range of health, welfare, and wellbeing benefits may be included in the total compensation package, based on eligibility