Cognizant DevOps Engineer Interview Questions and Process 2026

Cracking the Cognizant DevOps Engineer Interview

Cognizant is rapidly modernizing the IT infrastructure of its clients, moving them from legacy systems to agile, cloud-native environments. The DevOps Engineer role is highly sought after, and the interview process is rigorous, testing your knowledge across the entire software development lifecycle (SDLC).

Phase 1: Linux Fundamentals and Scripting

DevOps begins with a deep understanding of the underlying operating system.

• Linux Administration: You must be comfortable with the Linux command line. Expect questions on process management (top, ps), file permissions (chmod, chown), and networking (netstat, curl).
• Shell Scripting: "Write a Bash script to find all files in a directory larger than 100MB and delete them if they are older than 30 days." You must know how to automate mundane server tasks.
• Version Control (Git): You will be asked about branching strategies (GitFlow), resolving merge conflicts, and the difference between git merge and git rebase.

Phase 2: CI/CD Pipelines (The Core Round)

This round evaluates your ability to automate software delivery.

• Jenkins / Azure DevOps: "Walk me through how you set up a CI/CD pipeline from scratch." Expect deep questions on declarative pipelines, managing secrets/credentials, and integrating code quality tools (SonarQube).
• Build Tools: You must understand how code is compiled and packaged (e.g., Maven/Gradle for Java, npm for Node.js).
• Continuous Deployment: "How do you achieve Zero Downtime Deployment?" Be prepared to discuss strategies like Blue/Green deployments and Canary releases.

Phase 3: Containerization and Infrastructure as Code (IaC)

Modern DevOps relies heavily on containers and automation.

• Docker: "Explain the difference between a Docker image and a Docker container." You will be asked how to write an optimized Dockerfile and how to reduce image sizes.
• Kubernetes (K8s): For mid-to-senior roles, K8s knowledge is mandatory. Expect questions on Pods, Deployments, Services, Ingress, and ConfigMaps. "How does Kubernetes handle self-healing?"
• Terraform / Ansible: "How do you manage infrastructure drift?" You will be asked to explain the Terraform state file (terraform.tfstate) and how Ansible playbooks are structured for configuration management.

Top 3 Technical Questions to Prepare

1. Explain the architecture of Kubernetes. What are the components of the Control Plane and the Worker Nodes?
2. Your CI/CD pipeline suddenly starts failing randomly (flaky builds) without any code changes. How do you troubleshoot this?
3. Explain the concept of Infrastructure as Code (IaC). Write a basic Terraform snippet to provision an EC2 instance on AWS.