Mozilla Software Engineer Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 63 interview experiences · FREE TO READ
Candidate interview experiences
First-hand accounts from people who interviewed at Mozilla.
Mozilla
Software Engineer
Staff Difficult Negative experience No offer 4 rounds
Interview process
Recruiter call Technical screen Background check Take home
Interview formats
Behavioral Technical Coding
So I talked to the recruiter first, then had a technical screening, and then a behavioral interview with the engineering manager. After that, there was a take-home assignment, and that's where things didn't go so well. The people I spoke with were all really great, and I got the sense they have a solid engineering culture. But the take-home assessment didn't show that at all. It was one of those LeetCode-style brain teaser questions that has nothing to do with the actual job skills needed. Their real codebase uses React and Redux, so these LeetCode questions just prove if someone studied for them, memorized answers, or used Google/ChatGPT. It's a poor way to assess skills because someone fresh out of school who studied for these could pass, while someone with 10+ years of experience shipping projects might not.
Confirmed questions3 questions
- Can you describe some of your past projects?
- How do you handle disagreements with team members?
- What would your colleagues say about you?
Mozilla
Software Engineer
Senior Average Positive experience Accept offer 5 rounds
Interview process
Recruiter call Phone screen Technical screen Onsite
Interview formats
Behavioral Technical System Design
The interview process felt pretty standard, but the interviews themselves were top-notch. All the people I spoke with were great, and the questions really dug into what I knew and could do, rather than trick questions. It went through a few different stages: first, a chat with the recruiter, then a behavioral chat with the hiring manager, followed by about 3 to 4 rounds that lasted 45 minutes each. These rounds covered behavioral, technical, and systems design topics. They extended an offer about a week after that.
Confirmed questions5 questions
- Can you describe a challenging project you worked on?
- Share an example of a work success.
- Share an example of a work failure.
Mozilla
Software Engineer
Intern Easy Neutral experience No offer 4 rounds
Interview process
Recruiter call Take home Technical screen Phone screen
Interview formats
Technical Coding Behavioral
Applied in December for the 2019 Summer internship. Received a coding challenge in mid-January, then went through 3 interviews that were about a week apart. Got rejected almost two weeks after the interviews, with no communication in between. The interviews weren't too tough; the hardest part was likely language trivia. Algorithm questions were pretty basic, and I only needed to sketch out how to solve the problem, no actual whiteboard coding. The interviewers were all really nice. The recruiters weren't much help, mainly just setting up the interviews, and they didn't answer questions.
Confirmed questions4 questions
- What do you know about language trivia?
- Can you provide a simple algorithm design?
- Tell me about yourself and your experience.
Mozilla Software Engineer 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 →“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 reports →“Given an array, how would you zero out the rows and columns that contain a zero?”
Read reports →“Could you adjust names in a chat room given a Person class with first and last names? The rule is: if first names match, add the last initial; if last initials also match, add the full name; otherwise, just use the first name.”
Read report →“Can you build a toolbar using HTML and CSS?”
Read report →“Can you describe the background processes that occur when a user clicks on a website link?”
Read report →“Which ES6 feature do you like the most?”
Read report →“Could you solve LeetCode #20, but instead of True/False, return 0/1?”
Read report →Formats, difficulty and experience
Across all 63 Mozilla interview reports.