Cogitate Technology Solutions Full Stack Developer Interview Questions and Answers

Q1. 3 dsa problem asked
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Covers basics aps around 15 question

DSA based questions from leetcode easy and medium

Basic aptitude and coding problems were asked

System design and advanced algorithms were asked

Java, Object-Oriented Programming (OOP), SQL, and coding.

Q1. Stack Implementation
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Q2. Valid parentheses check
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Q1. What are joins in sql
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables based on a related column

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
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Q2. Types of arrays in PHP
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Types of arrays in PHP include indexed arrays, associative arrays, and multidimensional arrays.
• Indexed arrays: default type where each element is assigned a numeric index starting from 0.

• Associative arrays: elements are assigned a specific key instead of numeric index.

• Multidimensional arrays: arrays within arrays, creating a matrix-like structure.

• Example: $indexedArray = [1, 2, 3]; $associativeArray = ['key1' => 'value...read more
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Q1. Questions on IOT and related
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Questions mainly from Linked list.

Q1. Basically coding round, with basic questions from arrays. One needs to have good communication skills to explain to interviewers.
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