Software Engineer I

Klaviyo Campus•Boston, MA

10d

About The Position

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. - What's it like to ship code that thousands of people actually use? As a Software Engineer at Klaviyo, you'll find out fast. We're builders here: we run toward problems, hold ourselves to a high bar, and believe the work itself is the reward. Another payoff of this early career role is growth. You'll sharpen your skills, learn from engineers who've been in the trenches, and get your hands on projects that matter from day one. Our engineering teams build scalable, high-performance systems that power both our product and the infrastructure behind it. In this role, you'll get exposed to modern infrastructure and engineering practices that allow you to grow as a software engineer. We're an AI-first company, so you'll be expected to use AI tools to move faster, learn quicker, and do better work. You'll have ownership: writing and testing code, documenting it, deploying it, and keeping it running in production. If you're ready to launch your engineering career building systems that matter in a fast-moving, product-driven environment, this is your role. Dec 2026 grads: start dates on a rolling basis. Spring 2027 grads: start dates June–August.

Requirements

Two previous internship/co-op roles working with production-level code
Currently pursuing a degree in Computer Science, Engineering, Data Science, Math/Statistics, or a related field
Graduating in December 2026 or May/June 2027
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 give and take feedback directly. Klaviyos pull problems closer instead of avoiding them.
You're comfortable moving forward before every answer is known, and you adjust fast when the ground shifts under you.
You embrace Klaviyo's "always learning" culture, continually pushing yourself to grow as an engineer.
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.

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 (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.