I applied through an employee referral. I interviewed at BlackRock (London, England) in Dec 2022
Interview
On-site interview with 4 to 5 sessions involving a panel of 2 to 3 people each time. Each session runs for at least one hour so the whole process takes roughly a full working day.
Interview questions [1]
Question 1
Walk me through the standard linear model: its properties, its limitations and how they can be overcome.
How would you compute a vector norm in just one line in Python with Pandas ?
Complete two LeetCode problems. After solving each, record a short video explaining your reasoning, algorithm choice, key trade-offs, and time and space complexities. Focus on clarity, concision, and structured communication.
Interview questions [1]
Question 1
The example sequence 011212201220200112 ... is constructed as follows: 1. The first element in the sequence is 0. 2. For each iteration, repeat the following action: take a copy of the entire current sequence, replace 0 with 1, 1 with 2, and 2 with 0, and place it at the end of the current sequence. E.g. 0 -> 01 -> 0112 -> 01121220 -> ... Create an algorithm which determines what number is at the Nth position in the sequence (using 0-based indexing).
I completed a rigorous hiring process that involved 4 virtual interviews and a take-home assignment. Later had 7 on-site rounds focused on assessing my skills in Statistics, Machine Learning, Operating Systems, and System Design.
