Cognizant prep

Cognizant Mid-level (3–5 years) Coding / DSA

#01

Explain minimum window substring sliding window approach — Cognizant interview

Reported in Cognizant interview loops. Advanced string window question seen in strong coding interviews.

Hard Read answer →

Cognizant Mid-level (3–5 years) Coding / DSA

#02

When would you use a Trie for prefix search? — Cognizant interview

Reported in Cognizant interview loops. Data structure trade-off question for autocomplete and dictionary lookups.

Medium Read answer →

Cognizant Mid-level (3–5 years) Coding / DSA

#03

How do you find median of two sorted arrays in log time? — Cognizant interview

Reported in Cognizant interview loops. Hard interview classic requiring binary search partition logic.

Hard Read answer →

Cognizant Mid-level (3–5 years) Coding / DSA

#04

Explain Union-Find for dynamic connectivity problems — Cognizant interview

Reported in Cognizant interview loops. Disjoint set union structure used in graph connectivity interviews.

Medium Read answer →

Cognizant Mid-level (3–5 years) System design

#05

How would you design a scalable file upload service? — Cognizant interview

Reported in Cognizant interview loops. Design question around large files, durability, and secure uploads.

Medium Read answer →

Cognizant Mid-level (3–5 years) System design

#06

Design reliable webhook delivery with retries — Cognizant interview

Reported in Cognizant interview loops. Event delivery design question focusing on retries and idempotency.

Medium Read answer →

Cognizant Mid-level (3–5 years) Manager / leadership

#07

How do you communicate during a production incident? — Cognizant interview

Reported in Cognizant interview loops. Behavioral question assessing ownership and stakeholder communication.

Medium Read answer →

Cognizant Mid-level (3–5 years) HR / screening

#08

Describe a time you disagreed with your manager — Cognizant interview

Reported in Cognizant interview loops. Behavioral STAR prompt for respectful disagreement and influence.

Medium Read answer →

Cognizant Mid-level (3–5 years) Manager / leadership

#09

Describe successful cross-functional collaboration — Cognizant interview

Reported in Cognizant interview loops. Behavioral question on working with product, design, and support teams.

Medium Read answer →

Cognizant Mid-level (3–5 years) Technical deep dive

#10

Explain transaction propagation in Spring Boot — Cognizant interview

Reported in Cognizant interview loops. Framework internals question common in backend interviews.

Medium Read answer →

Cognizant Mid-level (3–5 years) Technical deep dive

#11

When to choose asyncio vs threading in Python? — Cognizant interview

Reported in Cognizant interview loops. Python concurrency interview topic for backend roles.

Medium Read answer →

Cognizant Mid-level (3–5 years) Technical deep dive

#12

How do you optimize unnecessary React re-renders? — Cognizant interview

Reported in Cognizant interview loops. Frontend performance question around memoization and state modeling.

Medium Read answer →

Cognizant Mid-level (3–5 years) Technical deep dive

#13

How do you debug CrashLoopBackOff in Kubernetes? — Cognizant interview

Reported in Cognizant interview loops. DevOps troubleshooting interview question for container orchestration.

Medium Read answer →

Cognizant Mid-level (3–5 years) Technical deep dive

#14

Compare blue-green and canary deployment strategies — Cognizant interview

Reported in Cognizant interview loops. Release engineering question focused on risk mitigation.

Medium Read answer →

Cognizant Mid-level (3–5 years) Technical deep dive

#15

How should Terraform state be managed in teams? — Cognizant interview

Reported in Cognizant interview loops. Infrastructure as code question around remote state and safety.

Medium Read answer →