Cognizant
American multinational information technology services and consulting company.
4 Rounds
~21 Days
Medium
The Interview Loop
Recruiter Screen (30 min)
Standard fit check, behavioral questions, and resume overview.
Technical Loop (3-4 Rounds)
Deep dive into domain knowledge, coding, and system design.
Interview Question Bank
Data Scientist
•
Coding
•
medium
Write a Python function using Pandas to merge two large datasets (10M+ rows) efficiently. What potential memory issues might you face and how do you resolve them?
#Pandas
#Memory Management
#Data Merging
Data Scientist
•
Coding
•
easy
Write a Python script from scratch to detect anomalies in a list of daily transaction volumes using the Z-score method.
#Statistics
#Anomaly Detection
#Arrays
Data Scientist
•
Coding
•
hard
Implement a basic TF-IDF vectorizer function in Python without using scikit-learn. It should take a list of strings and return a dictionary of TF-IDF scores.
#NLP
#Text Processing
#Math
Difficulty Radar
Based on recent AI-sourced data.
Meet Your Interviewers
The "Standard" Interviewer
Senior EngineerFocuses on core competencies, system constraints, and clear communication.
SimulateUnwritten Rules
Think Out Loud
Always explain your thought process before writing code or drawing architecture.