Mozilla Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 232 interview experiences · FREE TO READ
Which role are you interviewing for?
30 roles · 232 reportsCandidate interview experiences
First-hand accounts from people who interviewed at Mozilla.
Mozilla
Product Manager
Senior Difficult Neutral experience No offer 3 rounds
Interview process
Recruiter call Technical screen
Interview formats
Behavioral Technical
I had 2 interviews with HR initially. They mentioned the role had shifted from a strategic focus to an individual contributor role. Then, I had interviews with team members and the hiring manager where we discussed Product Sense. This part required knowledge of metrics and product sense frameworks.
Confirmed questions3 questions
- Can you discuss Netflix's product?
- What product sense frameworks do you know?
- What product metrics are you familiar with?
Mozilla
Creative Producer
Mid Average Negative experience No offer 3 rounds
Interview process
Recruiter call Technical screen Onsite
Interview formats
Behavioral Presentation
I had an initial 45-minute call with HR, followed by two more rounds with team members. The final interview was split into two parts because one of the team members couldn't make the original scheduled time. There was a significant wait for responses between interviews, but I was hopeful as I reached the final stage. After the last interview, I had to follow up multiple times. Eventually, I received an automated email stating I didn't get the role, which felt strange given I progressed so far. I was disappointed not to receive any feedback or even a personalized email from the recruiter.
Confirmed questions0 questions
No confirmed questions were included in this interview report.
Mozilla
Frontend Engineer
Mid Difficult Negative experience No offer 5 rounds
Interview process
Recruiter call Phone screen Technical screen Onsite Panel
Interview formats
Behavioral Technical Coding Other
It started with a recruiter screen, then a behavioural interview, followed by a 4 round loop. The loop included another behavioural interview, a technical interview with pair programming, a conversational technical interview, and a code review. I think I did well in all but one. They mentioned they wanted to hire quickly, but I didn't hear back for 2.5 weeks after the last round. It was unfortunate not to get any feedback after spending so much time talking with them.
Confirmed questions1 question
- Could you write an async function that takes an array of async functions (providers), each returning an array and a promise, and logs the results in ascending order based on position?
Mozilla
Product Data Scientist
Mid Average Positive experience No offer 7 rounds
Interview process
Recruiter call Phone screen Technical screen Presentation Onsite Background check Offer
Interview formats
Behavioral Technical Coding Presentation
First, I spoke with the recruiter on the phone. Then I had an interview with the hiring manager. After that, there were two technical interviews covering applied statistics in AB testing, Python, and SQL. This was followed by a virtual on-site interview. During the on-site, I was given a set of questions to work on and answer, and I had to prepare and deliver a presentation to a panel of three people (peers and managers) within two hours. I also interviewed with a manager and a stakeholder who works closely with data scientists. The day after the on-site, the recruiter gave me feedback. The entire experience was positive and respectful of my time. The process felt like a good preview of the actual job, and the questions weren't designed to be unfairly difficult.
Confirmed questions5 questions
- Can you elaborate on applied statistics as it relates to AB testing?
- How would you approach this problem using Python?
- How would you approach this problem using SQL?
Mozilla Interview Questions
Quoted word for word from Mozilla interview reports.
“Given a 2D matrix, write a function to zero out all elements in the rows and columns corresponding to any zero element found.”
Read reports →“For a struct A{ int a; char b;...}, what's the way to find the memory offset for a and b?”
Read reports →“How would you access a GitHub API to count the number of repositories containing specific words?”
Read reports →“What is the difference between GET and POST requests, and when should each be used?”
Read reports →“Given an array of unique objects, how can you traverse through them to find a given one and it's index. How would you do it you had to do it in constant time?”
Read report →“How would you reverse the order of words within a given string, using C++?”
Read report →“If the number of downloads suddenly decreases after a new installer is released, what are potential causes?”
Read report →“Given an array, how would you zero out the rows and columns that contain a zero?”
Read report →“Regarding image compression standards like JPEG's DCT transform, can you explain why DCT-based compression might be preferred over wavelet-based compression?”
Read report →Formats, difficulty and experience
Across all 232 Mozilla interview reports.