Software Engineer I

United States·Bostonmid

Software EngineerSoftware Engineering

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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,

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Software EngineerSoftware Engineering

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.

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.

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.

Data Infrastructure: Empower our internal teams and customers to get the best out of our data and agent platforms. underlying capabilities: Agent Platform, CDP revenue, Data Lake usage, Active API endpoints, Accounts with healthy API usage
MCMI: Own the growth, revenue, and reliability of our mobile channels and all messaging infrastructure.
Core Infrastructure: Empower our internal engineering, sales, and service teams to be as effective as possible by improving productivity of the eng, product, and design teams.
Growth Marketing Platform: Give marketers the tools they need to engage with their customers, be successful, and know where they stand.
AI & Analytics: Applies AI, data, and analytics to automate work, surface insights, and help customers make smarter decisions that maximize Klaviyo Attributed Value (KAV).
Autonomous Service: Builds AI-powered customer service experiences that help resolve issues, support transactions, and connect customers with human assistance when needed.

If you're excited about this role but your background doesn't check every box, apply anyway. Some of the strongest Klaviyos didn't start with a perfect resume match.

This role is not eligible for immigration sponsorship.

What We Offer

~2 min read

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.

IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. You can find our Job Applicant Privacy Notice here.

By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here.