Software Engineer Co-op (Spring 2027)

Klaviyo Campus • Boston, MA

2d • $50 - $61 • Onsite

About The Position

At Klaviyo, our Engineering teams build scalable, high-performance systems that power both our product and the infrastructure behind it. As a Software Engineering Co-op, you'll be part of a fast-paced, collaborative team whose work reaches thousands of customers worldwide. You won't just be writing code. You'll be solving hard problems, shaping how users experience our product, and learning from engineers who've been doing this for a while. This co-op is your shot to put your software development skills to work in production. You'll be embedded on one of our engineering teams, take on projects that matter to our customers, and build a technical foundation as you make connections across the business. Our co-ops come from all kinds of coding backgrounds, but they all share one thing: they're excited to build, own, and scale features end-to-end, from scratch. You'll work alongside experienced engineers, take on hard technical problems, and ship code that supports Klaviyo's mission. We're an AI-first company, so you'll be expected to use AI tools to support your work, learn faster, and do your best work here.

Requirements

• 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
• Experience with MySQL, Cassandra, Clickhouse, Kafka, Redis
• Experience with 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.
• 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.

Nice To Haves

• AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop).

Responsibilities

• 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.
• 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.
• 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.

Benefits

• Paid experience
• Lunch is on us 5 days a week
• Free snacks and drinks
• Ping pong
• Nintendo Switch
• Golf simulator
• Speakeasy
• 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.
• Generous benefits

What This Job Offers

• Job Type: Full-time
• Career Level: Intern
• Education Level: Associate degree