Klaviyo

Full Stack Engineering Intern Interview Experience - Boston, Massachusetts

November 14, 2025

Neutral ExperienceNo Offer

Process

I applied online.

The interview was 3.5 hours long with 3 rounds and 15-minute breaks in between each round.

The first round was a debugging challenge
The second round was a web app challenge
The third round was behavioral

Questions

For the debugging round, they asked a lot of optimization questions about the codebase, like how would we make this more efficient.

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Interview Statistics

The following metrics were computed from 1 interview experience for the Klaviyo Full Stack Engineering Intern role in Boston, Massachusetts.

Success Rate

0%

Pass Rate

Klaviyo's interview process for their Full Stack Engineering Intern roles in Boston, Massachusetts is extremely selective, failing the vast majority of engineers.

Experience Rating

Positive0%

Neutral100%

Negative0%

Candidates reported having mixed feelings for Klaviyo's Full Stack Engineering Intern interview process in Boston, Massachusetts.

Klaviyo Work Experiences

Good place to learn

Machine Learning Engineer • Former Employee

Pros: Strong culture, smart people, mostly nice, and good benefits.

Cons: Strong corporate vibes after Series D, and the culture became less open and more IPO-driven.

Good place to learn

Machine Learning Engineer • Former Employee

Pros: Strong culture, smart people, mostly nice, and good benefits.

Cons: Strong corporate vibes after Series D, and the culture became less open and more IPO-driven.

The hiring process and engineering team is great at Klayvio

Engineering Manager • Current Employee

Pros: The recruiters, managers, and developers I interviewed with were responsive, accommodating, and were just good down-to-earth folks. The engineering team is tight knit and truly full-stack, so I'll get to have a major impact on the product as a hands-on engineering manager.

Cons: I haven't yet experienced any negatives at Klaviyo.

The hiring process and engineering team is great at Klayvio

Engineering Manager • Current Employee

Pros: The recruiters, managers, and developers I interviewed with were responsive, accommodating, and were just good down-to-earth folks. The engineering team is tight knit and truly full-stack, so I'll get to have a major impact on the product as a hands-on engineering manager.

Cons: I haven't yet experienced any negatives at Klaviyo.

Perfect place for younger engineers looking to grow their skills and knowledge

Senior Software Engineer • Current Employee

Pros: - You get to work with some of the best, most intelligent, and hardworking people. - There are so many opportunities to learn and grow your technical and soft skills.

Cons: - It is a fast-paced company, meaning occasionally there are longer hours.

Perfect place for younger engineers looking to grow their skills and knowledge

Senior Software Engineer • Current Employee

Pros: - You get to work with some of the best, most intelligent, and hardworking people. - There are so many opportunities to learn and grow your technical and soft skills.

Cons: - It is a fast-paced company, meaning occasionally there are longer hours.

Good place to learn

Machine Learning Engineer • Former Employee

Pros: Strong culture, smart people, mostly nice, and good benefits.

Cons: Strong corporate vibes after Series D, and the culture became less open and more IPO-driven.

4.0
Good place to learn
Machine Learning Engineer • Former Employee
Boston, MA
July 15, 2023
Pros: Strong culture, smart people, mostly nice, and good benefits.
Cons: Strong corporate vibes after Series D, and the culture became less open and more IPO-driven.

The hiring process and engineering team is great at Klayvio

Engineering Manager • Current Employee

Pros: The recruiters, managers, and developers I interviewed with were responsive, accommodating, and were just good down-to-earth folks. The engineering team is tight knit and truly full-stack, so I'll get to have a major impact on the product as a hands-on engineering manager.

Cons: I haven't yet experienced any negatives at Klaviyo.

5.0
The hiring process and engineering team is great at Klayvio
Engineering Manager • Current Employee
Boston, MA
April 25, 2022
Pros: The recruiters, managers, and developers I interviewed with were responsive, accommodating, and were just good down-to-earth folks. The engineering team is tight knit and truly full-stack, so I'll get to have a major impact on the product as a hands-on engineering manager.
Cons: I haven't yet experienced any negatives at Klaviyo.

Perfect place for younger engineers looking to grow their skills and knowledge

Senior Software Engineer • Current Employee

Pros: - You get to work with some of the best, most intelligent, and hardworking people. - There are so many opportunities to learn and grow your technical and soft skills.

Cons: - It is a fast-paced company, meaning occasionally there are longer hours.

5.0
Perfect place for younger engineers looking to grow their skills and knowledge
Senior Software Engineer • Current Employee
Boston, MA
May 3, 2023
Pros: - You get to work with some of the best, most intelligent, and hardworking people. - There are so many opportunities to learn and grow your technical and soft skills.
Cons: - It is a fast-paced company, meaning occasionally there are longer hours.

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