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Klaviyo
Actively Hiring
Klaviyo is a unified customer platform for email, SMS, and more. Own your consumer data an
  • Responds within three weeks
    Based on past data, Klaviyo usually responds to incoming applications within three weeks
  • B2B
  • Public Stage
    Publicly traded company
  • +4

Front-end Software Engineering Internship-Summer 2025

Posted: 2 months ago• Recruiter recently active
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RelocationAllowed

About the job

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. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.

About our internship

Our Software Engineering internship is small. This is purposeful - so we can ensure each intern has meaningful and robust projects that directly impact our product and customers. It also creates a tight-knit group of interns who get to bond with each other over the course of the summer.

Interns are valued members of our engineering department, which is made up of small, agile teams that collaborate across Klaviyo to constantly ship work that impacts our product. Interns have ownership over features, while also learning from and connecting with fellow Klaviyos from engineering, product, design, and beyond to make sure they craft the right solutions. We operate a real-time data platform coded in Python built for massive scale on Amazon Web Services (AWS). Our frontend is built in modern React and Typescript serving customers around the world.

We move fast here - interns work on projects at scale and ship their work continuously throughout the summer. We offer a supportive environment where interns can test, fail, iterate and launch while building a solid technical foundation, awesome connections across the Klaviyo and having fun.

Interns come to Klaviyo with experience in a variety of coding languages, but they are all passionate about building, owning and scaling features end-to-end from scratch and breaking through any obstacle or technical challenge in their way.

How you’ll make an impact

  • Own features that our 100K+ paying customers rely on daily to reach their consumers to drive their business forward
  • Build new UI experiences to make complex areas of Klaviyo easier to use.
  • Work on foundational areas to help us internationalize Klaviyo, and make it more accessible and performant.
  • The code you write will help empower tens of thousands of Klaviyo customers daily to gain more value from the platform.

What We’re Looking For

  • At least one previous software engineering internship or co-op with software development experience
  • Graduating in December 2025 or May/June 2026
  • Experience with React
  • Experience with some of these technologies and languages:

    • Python, Django, Celery
    • MySQL, Clickhouse, RabbitMQ, Redis
    • React, HTML, Typescript, JavaScript
    • Amazon Web Services (EC2, RDS, Aurora, etc.) Terraform, Ansible, Packer, and other DevOps tools
  • Enjoy working with new technologies and adept at selecting the right tool for any job

  • Love digging into performance and scalability issues to drive breakthrough solutions-- whether it's a slow loading UI or too many clicks in a workflow, a database query timing out, or a queue that just won’t drain. You recognize all problems can be solved.

  • Enjoy shipping code early & often in an agile fashion, pairing with product management to craft better software by soliciting feedback from thousands of end users

  • Embrace Klaviyo’s “always learning” culture that fosters learning at every level, constantly pushing yourself to be a better engineer

Our Teams

Audience Growth

Engineers on the Audience Growth team have a unique opportunity to build experiences that are interacted with by millions of people every day. Engineers on the Audience Growth team can expect to work on a wide variety of projects, both enhancements to existing products, like Klaviyo's best-in-class Sign-up Forms product, and greenfield projects, new technologies, and new product offerings. We're a team that loves to iterate quickly, learn from our mistakes, and challenge each other to develop the best experiences for our customers. We're looking for someone who loves to jump into new projects and solve hard problems.

Component Library

The Component Library Team provides the tools and developer documentation to empower the engineering organization to build consistent, accessible user experiences.

Our mission is to provide consistency, testing, documentation, and accessibility for common user experiences throughout Klaviyo. By ensuring that our components are intuitive and inclusive, we can reduce the cognitive load of our customers, and improve time to delivery for our organization.

Onboarding

The Onboarding team at Klaviyo is focused on improving the early experience of Klaviyo for new customers. We work diligently to improve the rate at which customers are successfully setting up their Klaviyo account and gaining value from the platform. Engineers on the Onboarding team use data to discover opportunities for improvement, implement A/B tests to validate ideas, and work across the product to iteratively improve UX and reduce confusion for new customers. We are looking for great generalist software engineers that have an interest in growing a user-base and building a great customer onboarding pipeline.

Reviews

Reviews is a new offering at Klaviyo that provides our customers with the ability to record product reviews on their ecommerce store. Our reviews offering allows for easy installation, integrates seamlessly with the rest of the product and an easy to use onsite experience that enables our customers to record reviews on their products. As we have recently launched we're looking to build on the momentum and expand our offering quickly. We are looking for someone who can iterate quickly and enjoys working on a fast paced team.

Web Platform

The Web Platform team has a wide range of responsibilities that center around how we build, ship, monitor, and deploy our Javascript code. Engineers on this team primarily focus on improving our local frontend development experience, CI/CD pipeline for JS assets, performance + error monitoring systems, and a number of other things. Recently, the Web Platform team has also focused on building shared platform level systems, such as a "backend for frontend" service implemented with GraphQL, as well as implementing various improvements to our overall application performance. We are looking for engineers that already have some professional frontend experience and want to work on complex frontend problems that impact the entire Klaviyo product.

Internship Logistics

  • Our Summer Internship Program is a 11-week [June 2 - August 15] paid experience at our Boston, MA headquarters
  • Before diving into individual teams and projects, all interns will complete Klaviyo Base Camp - a week-plus onboarding experience. Base Camp provides focused time to learn about Klaviyo, our product, the ins and outs of engineering and spend time getting to know other interns. This robust training experience ensures all interns join their teams fully prepared to dive into project work and make an immediate impact.
  • Our Boston office is fun - our interns stay fueled with free snacks and drinks, take breaks with each other over a game of ping pong, nintendo or round of golf with our simulator, and relax in our speakeasy (yes you read that right!).
  • Throughout the summer, Klaviyo interns attend social events to promote interaction beyond team and project work. In past years these events have included a Red Sox game,outings to Versus and Flight Club in the Boston Seaport, ice cream socials, and Munch n Learns with Klaviyo senior leadership.
  • It is highly recommended that you apply prior to October 11

About the company

Klaviyo company logo

Klaviyo

Actively Hiring
Klaviyo is a unified customer platform for email, SMS, and more. Own your consumer data an1001-5000 Employees
Company Size
1001-5000
Company Type
SaaS
Company Type
Enterprise Software Company
Company Type
Email Marketing
Company Type
Analytics
  • Responds within three weeks
    Based on past data, Klaviyo usually responds to incoming applications within three weeks
  • B2B
  • Public Stage
    Publicly traded company
  • Top Investors
    This company has received a significant amount of investment from top investors
  • 4.6
    Highly rated
    Klaviyo is highly rated on Glassdoor, with 4.6 out of 5 stars
  • 4.5
    Work / Life Balance
    Employees rate Klaviyo 4.5/5 on Glassdoor for work / life balance
  • 4.6
    Strong Leadership
    Employees rate Klaviyo 4.6/5 on Glassdoor for faith in leadership
Learn more about Klaviyo image

Funding

AMOUNT RAISED
$678.5M
FUNDED OVER
5 rounds
Rounds
D
$320,000,000
Series D - Apr 2021+4

Perks

Healthcare benefits
401k plan & match
16 Weeks Paid Parental Leave
Equity benefits
Unlimited PTO
Wellness Benefits
Commuter benefits

Founders

Ed Hallen
Founder • 3 years
Boulder
image
Andrew Bialecki
Founder • 3 years
Boston
image
View the team image

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