Quest Global Senior Software Engineer Interview Questions and Answers

Q1. Explain the architecture of node.js
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Node.js is an open-source, cross-platform JavaScript runtime environment that executes JavaScript code outside of a web browser.
• Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.

• It uses the V8 JavaScript engine from Google to execute code.

• Node.js has a single-threaded event loop that allows handling multiple connections simultaneously.

• It has a rich library of various JavaScrip...read more
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Q2. Questions about the previous projects
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Q1. Asked about previous project.
Ans. You need to describe your current project
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Q2. Java 8 stream question (sorting,skip) sql query, exception,question from collection framework,different between hashmap and concurrent map
Ans. You need to study all these things
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Q3. Asked to write sql queries
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SQL queries are used to interact with databases, allowing data retrieval, manipulation, and management.
• SELECT statement: Used to retrieve data from a database. Example: SELECT * FROM employees;

• JOIN clause: Combines rows from two or more tables based on a related column. Example: SELECT a.name, b.department FROM employees a JOIN departments b ON a.dept_id = b.id;

• WHERE clause: Filters records based on specified condition...read more
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Q4. Asked to write one custom exception class
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A custom exception class allows for specific error handling in applications, enhancing clarity and control over error management.
• Define a class that extends the built-in Exception class.

• Include a constructor to initialize error messages and other relevant data.

• Override the __str__ method to provide a user-friendly error message.

• Example: class CustomError(Exception): pass

• Usage: raise CustomError('This is a custom error ...read more
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Q5. Asked difference between finally,finalize keyword in java
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In Java, 'finally' is a block for cleanup, while 'finalize' is a method for garbage collection.
• 'finally' is used in try-catch blocks to execute code regardless of exceptions.

• Example of 'finally': try { // code that may throw exception } catch (Exception e) { // handle exception } finally { // cleanup code }

• 'finalize' is a method in the Object class that is called by the garbage collector before an object is...read more
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Q1. Explain singleton design pattern
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Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Ensures a class has only one instance

• Provides a global point of access to that instance

• Commonly used for logging, caching, database connections, etc.
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Q2. Explain adaptive design pattern
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Adaptive design pattern is a software design pattern that allows objects to change their behavior dynamically.
• Adaptive design pattern involves creating objects that can change their behavior at runtime.

• It allows for flexibility and adaptability in software systems.

• Examples include Strategy pattern, State pattern, and Decorator pattern.
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Q1. Technical Question related to our stream
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Q1. Salary discussions etc
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Q1. Java8 Features Questions about Stream functions and Lambda Expression
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Q2. Microservices & Springboot (Sample code and Annotations)
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Q3. DB Query to find duplicates in a table, keeping first duplicate in answer.
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DB query to find duplicates in a table, keeping first duplicate in answer.
• Use GROUP BY clause to group the records by the column(s) that may have duplicates

• Use HAVING clause to filter out groups with only one record

• Use MIN or MAX function to select the first record in each group

• Example: SELECT MIN(id), name, COUNT(*) FROM table GROUP BY name HAVING COUNT(*) > 1
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Q4. Springboot Profiles, Actuators and Response mapping.
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Q5. Code to map Employee Object from List to Hashmap using Stream API functions.
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Code to map Employee Object from List to Hashmap using Stream API functions.
• Create a List of Employee objects

• Use stream() method to convert List to Stream

• Use collect() method to convert Stream to HashMap

• Use Collectors.toMap() method to create HashMap

• Pass key and value mapping functions to toMap() method
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Q1. I am in Aviation Testing, so questions were according - what is Do178b
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Q2. MCDC and how did you debug an error
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MCDC is a testing technique to ensure all possible combinations of conditions are tested. Debugging involves identifying and fixing errors in the code.
• MCDC stands for Modified Condition/Decision Coverage

• It is a testing technique used to ensure all possible combinations of conditions are tested

• Debugging involves identifying and fixing errors in the code

• To debug an error, I first reproduce the error and then use debuggin...read more
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Q1. Why do you want to switch
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C++ program to find unique string

Q1. Virtual function opps concepts
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Q2. Diamond problem
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The diamond problem occurs in multiple inheritance when a class inherits from two classes that share a common ancestor.
• Involves ambiguity in method resolution when two parent classes have the same method.

• Example: Class A has method 'foo', Class B and Class C both inherit from A and also define 'foo'.

• When Class D inherits from both B and C, which 'foo' does D inherit?

• Languages like C++ use virtual inheritance to resolve...read more
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