
Unit21 Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 35 interview experiences · FREE TO READ
Which role are you interviewing for?
16 roles · 35 reportsCandidate interview experiences
First-hand accounts from people who interviewed at Unit21.
AI Engineer
The interview started with a call with the CTO that covered behavioral aspects and checked if my background fit the role. Then, there was a technical interview where they tested my knowledge on LLMs and gave me a coding question related to applied LLMs. I got rejected after the second round, so I don't know what else is involved. I felt like I did well in both rounds, and the interviewers seemed positive, even discussing next steps. However, they chose someone with more experience.
- Can you share your experience?
- Could you define what a foundational model is?
- In what scenarios would you choose to pre-train, train, or fine-tune a model?
Marketing Manager
I dodged a bullet. My interviews started back in March. They strung me along with multiple interviews, an in person interview, and then an assignment. They talked to me like I was going to get the job after I nailed the assignment and presented it (and during the in-person interview as well). Then at the last minute, the classic bait and switch excuse of “we’ve decided not to move forward and pursue other finalists.” Their excuse was that they thought I wasn’t comfortable with the stage of the business, which is a lie. They’re using folks for free ideas with their assignment. Totally unethical. It’s now September and the position still looks open. So where are the other “finalists” they claimed they were going to pursue?
- What's your approach to optimizing a product page?
Software Engineer
So I got this interview request from a company, and the whole thing was super unprofessional, honestly, good riddance. They called me for a first phone screen, but the person on the line seemed really distracted, almost annoyed. They were clearly irritated when I asked them questions at the end. Then, they explained the technical interview would involve real-world problems related to projects I'd be working on, which I thought was a good sign. But then, the technical interview was just a bunch of LeetCode problems. I wasn't ready for that because I was studying the actual technologies they mentioned. I bombed it. After that, I heard nothing for weeks. A whole month passed. I tried reaching out multiple times, and finally, I got a generic rejection email two months after the technical interview. Seriously, avoid this place, they don't respect candidates at all.
- Do you know LeetCode easy and medium questions?
- Can you answer some API related questions?
Data Engineer
I applied via LinkedIn and had an initial screen with the recruiter. Then, there was a 30-minute technical discussion with the hiring manager. It turned out Spark was a key requirement, which wasn't clear initially and wasn't on my resume. I mentioned I could learn it and offered to do a take-home test. A few days later, I received a rejection email. The manager added a personal note explaining that they couldn't offer a Spark-focused take-home test, so they needed someone with Spark experience. I appreciated the respectful and specific reason for rejection, as it's been rare in my job search.
- Can you describe your experience?
Unit21 Interview Questions
Quoted word for word from Unit21 interview reports.
“Given a string of bunched words/acronyms, add spaces between words. For example, 'helloWorld' should become 'Hello World', and 'HelloNASAWorld' should become 'Hello NASA World'.”
Read reports →“Given a string, can you convert it to the proper cases? For example, "helloWorld" should become "Hello world", and "my VIN Number" should become "My VIN number".”
Read reports →“Can you add the Javascript to this page, preferably using React, to restrict input to only characters from the same keyboard row?”
Read reports →“How would you validate a JSON-like structure for a state machine, making sure it follows rules such as ensuring all terminal states are listed, terminal states don't link anywhere, and non-terminal states have correct next-state mappings?”
Read reports →“Could you build a calculator that processes a string like "5 * 3 -2 *4" and gives you the answer?”
Read report →“Could you define what a foundational model is?”
Read report →“In what scenarios would you choose to pre-train, train, or fine-tune a model?”
Read report →“Write code in type-script for fetching data from some api, populating them into a webpage, and follow-ups with pagination and search filter.”
Read report →“Could you build a React-based web application?”
Read report →Formats, difficulty and experience
Across all 35 Unit21 interview reports.