BillionToOne Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 62 interview experiences · FREE TO READ
Which role are you interviewing for?
17 roles · 62 reportsCandidate interview experiences
First-hand accounts from people who interviewed at BillionToOne.
BillionToOne
LIMS Associate
Senior Average Positive experience No offer 3 rounds
Interview process
Recruiter call Technical screen Onsite Panel Presentation Background check Offer
Interview formats
Technical Coding Behavioral
First off, I had to do some online tests, like personality, critical thinking, and some skill-based ones. Then, the first interview was about 30 mins on Zoom with the manager. After that, it was a 4-hour on-site thing with different people where I did logic puzzles, answered questions about my skills, general aptitude stuff, and a coding challenge. The last part was another 30-min Zoom call with an executive.
Confirmed questions3 questions
- Considering the stages presented, what step do you think is absent?
- Can you share an instance where you were unable to fulfill a client's immediate requirements and how you managed the situation?
- The coding challenges included FizzBuzz, the knapsack problem, and adding flipped arrays.
BillionToOne
Data Scientist
Entry Average Negative experience No offer 2 rounds
Interview process
Recruiter call Take home
Interview formats
Coding Technical
I applied online and was invited to an online assessment (OA) on Indeed. The recruiter was helpful and answered my questions about the OA. The assessment included easy multiple-choice questions on data visualization, followed by some odd and specific python and statistics questions that were sometimes worded unclearly. One question, for example, was confusing and asked for the result of a Python code snippet after parsing a JSON file, providing only a web address for the file. I wasn't sure if I was supposed to open the link during the assessment, and it made me question the company's approach. I did not advance to the next round.
Confirmed questions2 questions
- What is the output of the provided Python code?
- Can you explain the Bonferroni correction?
BillionToOne
Clinical Lab Assistant
Entry Difficult Neutral experience No offer 4 rounds
Interview process
Recruiter call Technical screen Onsite
Interview formats
Behavioral Technical Coding
The interview process had quite a few rounds, maybe 4 or 5 total. I only got to the second round. The interviewers seemed really engaged and like they genuinely cared about hiring the right person. However, the practical part wasn't very clear. I had asked the recruiter about it beforehand, but it was assumed I already knew PCR inside and out. The instructions were vague, and we had to jump right into the practical without any warm-up time with the lab equipment. This was after about 2.5 hours of non-stop interviews. I do know how to do PCR, but I was surprised by the specific pipettes they used and the somewhat unclear Standard Operating Procedure (SOP) provided. All in all, the people were nice and polite, so it was an okay experience.
Confirmed questions6 questions
- How would you handle working with diverse and potentially challenging individuals within a laboratory setting?
- Could you state what the acronym PCR represents?
- What is PCR?
BillionToOne
Clinical Lab Associate
Entry Difficult Neutral experience No offer 3 rounds
Interview process
Recruiter call Technical screen Onsite Take home Presentation
Interview formats
Behavioral Technical Coding Presentation
The interview process started with a Zoom call with the senior CLA. After that, I had to do an online skills assessment to check my attention to detail. The second interview was in person at the Union City facility and went for about two hours. I met with the lead CLA and the Associate Director of the lab. This part included a lab practical where I had to show I could use a micropipette to get PCR tubes ready. The plan was for a third interview with the CEO, but I didn't make it to that stage. I found out about not moving forward two weeks after the second interview. Everyone I spoke with was nice.
Confirmed questions8 questions
- Describe your teamwork skills.
- Where do you see yourself in the next 1-2 years?
- Can you explain PCR and what could go wrong with it?
BillionToOne Interview Questions
Quoted word for word from BillionToOne interview reports.
“Given a mother who is a carrier for sickle cell disease, and neither parent exhibits symptoms, with a 1% population prevalence, what is the probability of the baby developing sickle cell disease?”
Read reports →“Do you know the port number for SSH data transfer?”
Read reports →“What is the output of the provided Python code?”
Read reports →“Regarding drunk drivers, 1% of all drivers are drunk. Out of every 100 random drivers you pull over, how many would test positive for being drunk?”
Read reports →“What are the various types of pipettes utilized in PCR procedures?”
Read report →“Could you state what the acronym PCR represents?”
Read report →“What would be the output given an SQL command concerning relational databases?”
Read report →“Could you explain the concept of a p-value?”
Read report →“Can you explain PCR and what could go wrong with it?”
Read report →Formats, difficulty and experience
Across all 62 BillionToOne interview reports.