Klaviyo Software Engineer Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 117 interview experiences · FREE TO READ
Candidate interview experiences
First-hand accounts from people who interviewed at Klaviyo.
Klaviyo
Software Engineer
Mid Average Positive experience Accept offer 4 rounds
Interview process
Recruiter call Technical screen Phone screen Onsite
Interview formats
Behavioral Coding Technical System Design
The interview process can be quick or drawn out depending on the candidate. I managed to get through the initial 3 stages in just 6 days, and then the final onsite was a full day with about 3 hours of interviews. First up was a recruiter call to gauge how strong of a candidate I was. It's important to explain your past projects clearly, even to someone non-technical. The more you can highlight the impact of your work, the better the recruiter will rate you. My recruiter said I was a 'Strong Candidate,' which I think really helped. Next was a skills assessment called CodeSignal, which could be done in Python or JavaScript; I used Python. It presented a real-world problem: build a Python class with specific methods, and you're given unit tests. You don't need a perfect score to advance; I reached the end of level 2 but ran out of time, assuming strong senior candidates would hit level 3. Then, I spoke with the Hiring Manager, who would be my manager if I got the job. This was similar to the recruiter call but more technical. Again, emphasize the IMPACT of your work. The recruiter mentioned I got a 'Strong Positive signal' here, which was a big plus. The final stage was a virtual onsite with two technical rounds and a conversation with my potential manager. They delve deeper into technical details, so be prepared to justify your design decisions.
Confirmed questions5 questions
- Can you describe a recent project and go into detail about its technical aspects?
- Could you explain a project you've worked on, making it understandable for someone without a technical background?
- How would you present your projects and their outcomes effectively?
Klaviyo
Software Engineer
Senior Easy Positive experience No offer 6 rounds
Interview process
Take home Recruiter call Onsite Onsite Onsite Onsite
Interview formats
Coding Behavioral System Design Coding System Design
The interview process started with a coding assignment on CodeSignal, which was either take-home or timed. Then, I had a chat with the hiring manager about my background and fit for the role. The rest of the interviews were onsite. First, there was a technical deep dive into my past projects and decisions. Next, a behavioral interview focusing on leadership and teamwork. Then, a coding round where I had to design and build an API, thinking about scalability and maintainability. Finally, a system design round where I had to improve an existing design, focusing on scalability and trade-offs. I think I didn't do great on this last one. The interviewers were nice and accommodating.
Confirmed questions7 questions
- How have you resolved conflict?
- Can you tell me about your background and what interests you?
- Walk me through your past projects and contributions, including the reasoning behind architectural choices.
Klaviyo
Software Engineer
Intern Average Neutral experience No offer 2 rounds
Interview process
Technical screen Recruiter call
Interview formats
Coding Technical Behavioral
The coding challenge involved working with an engineer to fix and enhance a Python weather API. It focused on reading, debugging, and improving existing code, not really algorithms. They were looking for problem-solving and teamwork skills, using tools like Postman for testing. There was also a hiring manager interview where we talked about my background, some tech challenges I'd tackled, and how I learn and take feedback. It felt more about working together and making code better than just knowing syntax.
Confirmed questions3 questions
- Can you describe your thought process and how you'd approach solving this?
- Can you elaborate on your thought process and how you'd go about solving it with the engineering manager?
- The technical part will dive deep into APIs and improving current code, so make sure you know a lot about that.
Klaviyo Software Engineer Interview Questions
Quoted word for word from Klaviyo interview reports.
“Create a countdown timer in React using luxon, not the standard JS date, completing 4 parts within 40 minutes.”
Read reports →“What's the average order value for gender 0 and gender 1, and do you think the difference is significant, with justification?”
Read reports →“Using Python, can you create a class with specific methods based on a given prompt and provided unit tests?”
Read reports →“Considering a system where cart checkouts are recorded in a SQL table and processed by multiple EC2-hosted processes, what are the implications of an EC2 instance failure?”
Read reports →“Create a resume manager application that allows users to add new recipes, modify existing ones, and search for recipes by their name.”
Read report →“Can you build a dataframe with customer details like ID, gender, last order date, and total orders, then sort it and show the first 10 entries?”
Read report →“Given this code, how would you modify it to improve its efficiency and reduce overhead?”
Read report →“Given that multiple teams have developed data pipelines with inconsistent frameworks, how should a new data pipeline be designed to use a standardized framework?”
Read report →“What would be the user interface requirements for internal developers using this standardized data pipeline framework?”
Read report →Formats, difficulty and experience
Across all 117 Klaviyo interview reports.