Cognizant

American multinational information technology services and consulting company.

4 Rounds ~21 Days Medium

Start Mock Interview

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

All Roles Backend Engineer 35 Cloud Engineer 35 Data Engineer 35 Data Scientist 35 Frontend Engineer 35 Machine Learning Engineer 35 Product Manager 35 Software Engineer 35

All Topics Cloud Architecture 4 Security 3 DevOps 3 Infrastructure as Code 3 Container Orchestration 3 Scripting 3 Networking 3 Cloud Services 2

Cloud Engineer • Behavioral • medium

Tell me about a time you had to push back on a client's architectural request because it wasn't aligned with cloud best practices.

#Client Management #Communication #Best Practices

Practice

Cloud Engineer • Behavioral • medium

Describe a situation where you had to deliver a critical cloud infrastructure project under a very tight deadline. How did you prioritize?

#Time Management #Prioritization #Agile

Practice

Cloud Engineer • Behavioral • hard

Tell me about the most difficult production outage you had to troubleshoot. What was your approach to finding the root cause?

#Incident Management #Problem Solving #Observability

Practice

Cloud Engineer • Behavioral • easy

Cloud technologies change rapidly. Tell me about a new cloud service or DevOps tool you learned recently and how you applied it.

#Continuous Learning #Adaptability #Technology Trends

Practice

Cloud Engineer • Behavioral • medium

Describe a time when you disagreed with a senior engineer or architect on a technical design. How did you resolve the disagreement?

#Conflict Resolution #Communication #Teamwork

Practice

Cloud Engineer • Coding • medium

Write a Python script using Boto3 to find and delete all unattached EBS volumes in a specific AWS region to save costs.

#Python #Boto3 #AWS #Automation

Practice

Cloud Engineer • Coding • medium

Write a bash script to parse an Nginx access log and find the top 10 IP addresses making requests.

#Bash #Linux #Log Parsing

Practice

Cloud Engineer • Coding • medium

Write a Python script to check the expiration dates of SSL certificates across a list of domains and alert if they expire within 30 days.

#Python #Security #Automation

Practice

Cloud Engineer • Coding • hard

Given an array of integers, write a function to find the first missing positive integer. It must run in O(n) time and use O(1) auxiliary space.

#Arrays #Optimization #Data Structures

Practice

Cloud Engineer • System Design • hard

A Cognizant enterprise client wants to migrate their on-premise monolithic application to AWS. Walk me through your migration strategy.

#Cloud Migration #AWS #Enterprise Architecture

Practice

Cloud Engineer • System Design • medium

How would you design a CI/CD pipeline for a containerized microservices application using Jenkins, Docker, and Kubernetes?

#CI/CD #Jenkins #Kubernetes #Docker

Practice

Cloud Engineer • System Design • medium

Design a highly available and fault-tolerant 3-tier web architecture on Azure.

#Azure #High Availability #System Design

Practice

Cloud Engineer • System Design • medium

Design a serverless architecture for an image processing application that creates thumbnails whenever a user uploads a photo.

#Serverless #AWS #Event-Driven

Practice

Cloud Engineer • System Design • hard

How would you design a Disaster Recovery (DR) strategy with an RPO of 15 minutes and an RTO of 1 hour for a critical database?

#Disaster Recovery #RPO/RTO #Databases

Practice

Cloud Engineer • System Design • hard

Design a centralized logging and monitoring solution for a multi-cloud environment spanning AWS and Azure.

#Multi-Cloud #Logging #Monitoring #System Design

Practice

Cloud Engineer • Technical • medium

Explain the difference between an Application Load Balancer (ALB) and a Network Load Balancer (NLB) in AWS. When would you choose one over the other?

#AWS #Load Balancing #OSI Model

Practice

Cloud Engineer • Technical • medium

How do you handle Terraform state files in a multi-developer environment to prevent conflicts and ensure security?

#Terraform #State Management #Collaboration

Practice

Cloud Engineer • Technical • hard

Walk me through exactly what happens in the control plane when you run `kubectl apply -f deployment.yaml`.

#Kubernetes #Architecture #API Server

Practice

Cloud Engineer • Technical • medium

Explain the difference between Azure Service Bus and Azure Event Grid. When would you use each in a microservices architecture?

#Azure #Messaging #Event-Driven Architecture

Practice

Cloud Engineer • Technical • easy

What is the difference between a Security Group and a Network ACL in AWS?

#AWS #Security #VPC

Practice

Cloud Engineer • Technical • medium

How do you manage secrets and sensitive data in a Kubernetes environment? Why are native K8s secrets not enough?

#Kubernetes #Secrets Management #DevSecOps

Practice

Cloud Engineer • Technical • medium

How do you optimize a Dockerfile to reduce the image size and improve security?

#Docker #Optimization #Security

Practice

Cloud Engineer • Technical • medium

Compare Google Kubernetes Engine (GKE) Autopilot with Standard GKE. When would you recommend Autopilot to a client?

#GCP #Kubernetes #Managed Services

Practice

Cloud Engineer • Technical • medium

When would you choose Amazon Aurora over Amazon RDS for PostgreSQL?

#AWS #Databases #Performance

Practice

Cloud Engineer • Technical • medium

What are Terraform modules, and how do you version control and distribute them across an enterprise?

#Terraform #Reusability #Version Control

Practice

Cloud Engineer • Technical • easy

Explain the difference between a ClusterIP, NodePort, and LoadBalancer service in Kubernetes.

#Kubernetes #Networking #Services

Practice

Cloud Engineer • Technical • hard

A client's AWS bill has spiked by 40% over the last month. How do you investigate and optimize their cloud costs?

#AWS #Cost Optimization #FinOps

Practice

Cloud Engineer • Technical • medium

How do you establish a secure, highly available connection between an on-premise data center and an AWS VPC?

#AWS #Hybrid Cloud #VPN #Direct Connect

Practice

Cloud Engineer • Technical • medium

What are Azure Managed Identities, and how do they differ from Service Principals?

#Azure #IAM #Security

Practice

Cloud Engineer • Technical • medium

Explain the concept of GitOps. How does a tool like ArgoCD implement this pattern?

#GitOps #ArgoCD #Kubernetes

Practice

Cloud Engineer • Technical • easy

Explain the lifecycle of an S3 object and how you would use S3 Lifecycle policies to reduce storage costs over time.

#AWS #S3 #Cost Optimization

Practice

Cloud Engineer • Technical • medium

What is the `terraform taint` command, and how has its functionality changed in newer versions of Terraform?

#Terraform #State Management

Practice

Cloud Engineer • Technical • hard

How do you implement autoscaling in Kubernetes? Discuss the differences between HPA, VPA, and Cluster Autoscaler.

#Kubernetes #Autoscaling #Performance

Practice

Cloud Engineer • Technical • easy

Explain the AWS Shared Responsibility Model. What is the customer responsible for when using EC2 compared to Lambda?

#AWS #Security #Compliance

Practice

Cloud Engineer • Technical • medium

Walk me through the process of setting up a blue-green deployment in Azure App Service.

#Azure #Deployment Strategies #CI/CD

Practice

Difficulty Radar

Based on recent AI-sourced data.

Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

Simulate

Unwritten Rules

Think Out Loud

Always explain your thought process before writing code or drawing architecture.

Practice Now