Lab49 Frontend Engineer Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 8 interview experiences · FREE TO READ
Candidate interview experiences
First-hand accounts from people who interviewed at Lab49.
Lab49
Senior Frontend Engineer
Senior Difficult Positive experience Accept offer 7 rounds
Interview process
Recruiter call Phone screen Onsite
Interview formats
Technical Coding System Design Behavioral
The interview process was thorough and quite impressive. It kicked off with a phone call where I discussed my background, followed by the recruiter posing a set of multiple-choice questions covering front-end and general software engineering. Frankly, I found this part a bit off-putting, as I generally see technical questions as a chance for dialogue, and getting them from someone without that expertise can be frustrating. Nevertheless, I advanced and had a phone interview with a current Lab49 engineer who asked me several algorithmic problems. After clearing that stage, I proceeded to the onsite interviews, which consisted of five separate interviews, including whiteboard sessions, JavaScript coding challenges on a laptop (within a well-configured test environment), and questions related to solution design.
Confirmed questions1 question
- How can you create a spy for a JavaScript object?
Lab49
Front End Developer
Mid Average Negative experience No offer 2 rounds
Interview process
Recruiter call Phone screen
Interview formats
Technical Coding
Got a LinkedIn message, chatted with an in-house recruiter and set up a 45-minute interview for the next day with two tech folks. It didn't go great, I was on my mobile and they were on a conference phone, which made it hard to hear clearly with all the clipped words and pauses. They asked one simple question, but I sensed it was going to be one of those super-detailed 'alpha-geek' interviews and I just wasn't up for the challenge or their reputation for being tough interviewers, so I decided to call it quits.
Confirmed questions1 question
- Could you explain the distinction between null and undefined?
Lab49
Front-End Developer
Entry Easy Positive experience No offer 2 rounds
Interview process
Recruiter call Technical screen
Interview formats
Behavioral Technical Coding
First I had an HR interview where they mostly explained how the company operates. After that, there was a technical interview that focused heavily on javascript, specifically asking many questions about javascript objects and their behavior.
Confirmed questions1 question
- Can you tell me about yourself?
Lab49 Frontend Engineer Interview Questions
Quoted word for word from Lab49 interview reports.
“Regarding this JavaScript code: [1,2,3].foreach((i, v) => { let temp = i; }); console.log(temp), what would be the output?”
Read reports →“How can you create a spy for a JavaScript object?”
Read reports →“Could you explain the distinction between null and undefined?”
Read reports →“Can you implement a debounce function?”
Read reports →“If a function takes one second to complete and you must run it 10 million times, what strategies would you use to reduce the total execution time?”
Read report →“Could you design the back-end architecture for a music-recognition service on the whiteboard?”
Read report →“Were there mostly front end related questions?”
Read report →“How do you figure out which features clients would find valuable?”
Read report →Formats, difficulty and experience
Across all 8 Lab49 interview reports.