BCG -X Junior Engineer(SWE/Data) Interview Experience
335
Mar 20, 2026

BCG takes 3 rounds for the Junior Engineer Role and had two channels for SWE and Data Engineering (Please note this is Data Engineering not Data Science Channel)

Round 1:
Discussion about projects mainly I was given a short missing number from 1..n numbers.Solved it with arithematic progression equation.I was also given a list of dictionaries

wherein I needed to find the aggregate of the particular user id
I was also asked to write an SQL Query with the correct syntax.

Difference Between Array and Hashmap.

Round 2: Grilled on Projects Concentrated Both on SWE and Data Side End

  1. JavaScript events code an example for preventdefault.
  2. What are APIs code get put post and patch
  3. What is localstorage
  4. What are ORM
  5. Decorator Functions and Generator Function
  6. Tricky snippet of Lambda Function and asked output for the same
  7. 8 SQL Queries getting tougher each time
  8. React useEffect and useState why and when used
  9. Database Indexing
  10. Project/Internship Discussion on Resume

Round 3: Managerial Round

1.Asked about Past projects
2.Scare Moment in Development if any
3.Weaknesses
4.Team Collaboration situation scenario
5.Condition wherein I have a critical situation and I got assigned some work on Friday. How to handle then?

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