Working at Klaviyo | Glassdoor

Klaviyo Overview

Boston, MA
201 to 500 employees
Company - Private
Computer Hardware & Software
Unknown / Non-Applicable
Klaviyo has built database technology to make 1:1 personalized conversations easy. Our software aggregates everything a business knows about their customers into individual profiles in our customer analytics database. We’ve paired that with an email platform that makes ... Read more

Mission: Make it simple for businesses & brands to provide a unique, 1:1 experience for each customer.

Company Updates


    Klaviyo Engineering

    Adventures in Data Science, Real-Time Data Processing with Python, MySQL and Cassandra. ecommerce marketing automation. Boston Engineering.

  • We crushed 2017 - here's the evidence!

    2017 Year in Review - Klaviyo

    We realized very early on that the problem wasn't convincing the people behind those irrelevant communications to care more about what they were saying. It was the opposite. In the conversations we had with marketers and ecommerce founders, we were floored by their dedication to their customers and the creative and ambitious experiences they wanted to create.

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Klaviyo – Why Work With Us?

Before starting Klaviyo in 2012, we spent time at Google, Performable (acquired by HubSpot) and Applied Predictive Technologies (acquired by Mastercard) using data and technology to help marketers get smarter at many of the world’s largest companies.

Over the last four years, Klaviyo has grown from two people to a team of over 100 people in downtown Boston. From fast growing ecommerce stores to some of the world’s largest companies, we work with thousands of companies around the globe to send tens of millions of emails every day.

Bootstrapped and profitable from the start, in 2015, we partnered with Accomplice to allow us to go faster.

What We're Building

Email is the #1 communication channel between companies and their customers and users. At Klaviyo, we're building the best platform to send email. We believe creating relevant, beautiful, personalized emails should be easy.

Today, companies spend up to 80% of their time just creating and managing emails. Our mission is to change that and let marketers focus on what they do best, being creative and crafting amazing content their customers will love. From newsletters to targeted campaigns or every day transactional emails, Klaviyo is the intuitive email platform for creating, managing and measuring every email a business sends.

Klaviyo is changing how businesses send email.

What we can promise:

  • You'll be in the middle of a super high growth startup that's bootstrapped, profitable and working on building a lasting company and culture.
  • You'll work on projects that change how millions of people engage with their favorite brands and companies.
  • You'll be challenged and work with other people who like to be challenged and have a great time doing it.
  • You'll have fun, laugh and learn. Weekly lunch and learns, tech talks, Friday afternoon happy hours, stand up desks, latest laptops, unlimited snacks, games and team outings to the Red Sox, Lawn on D, go-kart racing and other fun spots in Boston.

Sound good? Drop us a line. We're always looking for great people to join our team.

Careers at Klaviyo - Senior Software Engineer

Klaviyo is a Boston startup located right in the heart of downtown Boston.  We craft software helping thousands of ecommerce companies to have engaging relationships with hundreds of millions of consumers.  We love tackling tough engineering problems and look for full stack engineers who specialize in certain areas but are passionate about building, owning & scaling features end to end from scratch and breaking through any obstacle or technical challenge in their way. We push each other to move out of our comfort zone, learn new technologies and work hard to ensure each day is better than the last. 

You Will

  • Have the chance to wholly own features that thousands of our customers rely on daily to reach 100,000,000+ of consumers to drive their business forward
  • Work on crafting our highly scalable real-time data pipeline that processes billions of events monthly across data sets growing to petabyte scale
  • Be empowered to own the mission, technical direction and operations of projects that have immediate impact
  • Advance your technical skills in all facets ranging from front end web development and user experience to machine learning and massively parallelized data pipelines.
  • Contribute to the company as a subject matter expert in multiple areas, constantly pushing yourself to be a better engineer and to level up all of your peers within your team and within Klaviyo


  • Have experience building products that matter and pushing yourself and your team to be better engineers and build a product with passionate advocates
  • Enjoy working with new technologies ranging from the frontend to backend, and are particularly passionate and an expert in multiple stack areas. You show this by having strong and opinionated experience with various technologies and know how to pick 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
  • Like working on a small, autonomous agile teams. At Klaviyo, you will have ownership of features, but you'll collaborate with everyone to make sure we produce the right solution.

Klaviyo Reviews

  • Helpful (1)

    "Great working environment"

    • Work/Life Balance
    • Culture & Values
    • Career Opportunities
    • Comp & Benefits
    • Senior Management
    Former Employee - Sales Engineer in Boston, MA
    Former Employee - Sales Engineer in Boston, MA
    Positive Outlook
    Approves of CEO

    I worked at Klaviyo full-time (More than a year)


    - growth opportunities.
    - transparent leadership.
    - a chance to make an impact.
    - supportive co-workers.
    - awesome company culture.


    - not the best place for jr individuals.

    Advice to Management

    Keep up the good work.

See All 47 Reviews

Klaviyo Photos

Klaviyo photo of: Klaviyo!
Klaviyo photo of: Klaviyo
Klaviyo photo of: Engineering Catch-up with our CEO
Klaviyo photo of: Pasta making
Klaviyo photo of: Team Klaviyo
Klaviyo photo of: Klaviyo in Miami for for Pats Game!
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Klaviyo Interviews



Getting an Interview

Getting an Interview





    Product Expert Interview

    Anonymous Interview Candidate
    No Offer
    Negative Experience
    Average Interview


    Too many interviews in the process, they make you do an assignment in which the instructions weren't that clear, I decided not to continue further in the process and that was that.

    Interview Questions

    • What made you interested in working at Klaviyo?   1 Answer
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Klaviyo Awards & Accolades

Let us know if we're missing any workplace or industry recognition – Add Awards

Pledges & Certifications

Veteran Hiring Commitment

Committed to helping America's military veterans find work

Pay Equality Pledge

Committed to paying equitably for equal work & experience

Tech Hiring Commitment

Helping to train, hire and promote more technology workers

Career Advancement Program

Helping employees "upskill" into higher-paying positions

Diversity Commitment

Has programs that support a diverse and inclusive workforce

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