Cognizant Developer Interview Guide
Published July 22, 2026 · Updated July 22, 2026
Evidence-backed preparation playbook for Cognizant Developer interviews. 5 reported questions, top topics, difficulty breakdown, and a free assessment.
2-5 years
Most reported exp
Rounds reported
Technical 5q
Topics most frequently reported
✓SQL / Joins
1 question · 20%
✓SQL / Indexing
1 question · 20%
✓SQL / Normalization
1 question · 20%
·SQL / Window Functions
1 question · 20%
·SQL / Query Optimization
1 question · 20%
Free · 10 minutes
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Top Questions — Ranked by Community Votes
These 5 questions appeared most in Cognizant Developer reports. Master these first.
Cognizant
Hard
Technical round
2-6 yearsSQL
Write a query to find, for each department, the employee with the second-highest salary, using window functions instead of a correlated subquery.
↑ 33 upvotes · 25 engineers asked this · Developer
Cognizant
Easy
Technical round
0-3 yearsSQL
Explain the difference between INNER JOIN, LEFT JOIN, and FULL OUTER JOIN with a simple example of Orders and Customers tables.
↑ 30 upvotes · 22 engineers asked this · Developer
Cognizant
Medium
Technical round
2-5 yearsSQL
A SELECT query filtering on a non-indexed column takes 8 seconds on a 10 million row table. Would adding an index always help? What's the trade-off of adding too many indexes?
↑ 26 upvotes · 15 engineers asked this · Developer
Cognizant
Medium
Technical round
1-4 yearsSQL
What problem does database normalization (1NF, 2NF, 3NF) actually solve? Give an example of an update anomaly in an unnormalized table.
↑ 21 upvotes · 12 engineers asked this · Developer
Cognizant
Medium
Technical round
2-5 yearsSQL
How would you find out why a specific SQL query is slow before making any changes to it?
↑ 19 upvotes · 8 engineers asked this · Developer
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Frequently asked questions
How hard is the Cognizant Developer interview?
Medium–Hard difficulty based on 5 reported questions. Most questions cover SQL / Joins, SQL / Indexing, SQL / Normalization.
What topics does Cognizant ask Developers?
Top reported topics: SQL / Joins (1 questions), SQL / Indexing (1 questions), SQL / Normalization (1 questions), SQL / Window Functions (1 questions), SQL / Query Optimization (1 questions).
How many rounds does Cognizant have for Developer?
Reported rounds: Technical.
What experience level does Cognizant hire Developers at?
Most reported: 2-5 years and 0-3 years.