Quest Global Senior iOS Engineer Interview Questions and Answers

Q1. What happens when you enter google.com in the web browser?
Ans. 
When you enter google.com in the web browser, the browser sends a request to Google's servers, which then respond with the Google homepage.
• Browser sends a request to DNS server to resolve the domain name 'google.com' to an IP address

• Browser then sends a request to the IP address associated with 'google.com'

• Google's servers respond with the HTML content of the Google homepage

• Browser renders the HTML content and displays
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Q2. Explain different types of software testing?
Ans. 
Different types of software testing include unit testing, integration testing, system testing, and acceptance testing.
• Unit testing: Testing individual components or modules of the software in isolation.

• Integration testing: Testing how different modules work together as a group.

• System testing: Testing the entire system as a whole to ensure it meets requirements.

• Acceptance testing: Testing the software with end users to
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Q1. How do you seen yourself 2 years from now?
Ans. 
In 2 years, I see myself as a senior software engineer leading a team of developers on innovative projects.
• Leading a team of developers on innovative projects

• Taking on more responsibilities and challenges

• Continuing to learn and grow in my technical skills
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Q2. Do you think these skills are sufficient to become a project manager?
Ans. 
Possessing technical skills alone may not be sufficient to become a project manager.
• Project management requires a combination of technical skills, leadership abilities, communication skills, and organizational skills.

• Experience in managing projects, leading teams, and handling stakeholders is crucial for a project manager role.

• Certifications such as PMP (Project Management Professional) can also be beneficial in transi
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Q1. What is inheritance
Ans. 
Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.
• Allows for code reusability by creating a new class based on an existing class

• Derived class (subclass) inherits properties and behaviors from a base class (superclass)

• Can have multiple levels of inheritance, creating a hierarchy of classes

• Example: Animal class can be a base class with Dog and Cat
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Q2. What is polymorphism
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or classes.

• Examples include method overloading and method overriding in object-oriented programming.
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Q3. Write a code for string reverse
Ans. 
Code to reverse a string using array of characters
• Iterate through half of the string and swap characters from start and end

• Use a temporary variable to store the character being swapped

• Handle edge cases like empty string or single character string
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Q1. Questions on streams rest api
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Q1. Managerial discussion
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Q1. What is abstraction and how can we achieve it?
Ans. 
Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the outside world.
• Abstraction allows us to focus on what an object does rather than how it does it

• Achieved through abstract classes and interfaces in object-oriented programming

• Example: A car dashboard abstracts the internal workings of the car and provides only essential information to the driver
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Q2. Difference between hashtable and hashmap
Ans. 
Hashtable is synchronized, while hashmap is not. Hashtable does not allow null keys or values, while hashmap does.
• Hashtable is synchronized, while hashmap is not

• Hashtable does not allow null keys or values, while hashmap does

• Hashtable is a legacy class, while hashmap is a newer class
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Q3. How get() works insterally in hashmap
Ans. 
The get() method in HashMap retrieves the value associated with a specified key.
• get() method takes a key as input and returns the value associated with that key in the HashMap.

• Internally, get() uses the hash code of the key to find the corresponding bucket in the HashMap.

• If multiple keys have the same hash code, get() uses the equals() method to find the correct key-value pair.
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Q4. What is normalization?
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization helps in minimizing data redundancy by dividing the database into multiple tables and defining relationships between them.

• It ensures data integrity by avoiding update anomalies and inconsistencies.

• There are different normal forms such as 1NF, 2NF, 3NF, BCNF, and 4NF, each with specific rules to fo...read more
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Q5. What are constraints?
Ans. 
Constraints are limitations or restrictions placed on a system or process.
• Constraints define the boundaries within which a system must operate.

• They can include limitations on resources, time, or functionality.

• Examples of constraints in software engineering include memory limitations, processing speed, and input/output requirements.
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Q6. Write a query to get 3rd highest salary from the employee table
Ans. 
Query to retrieve the 3rd highest salary from the employee table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to retrieve the 3rd highest salary
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Q7. Write a code to get 2nd last node and its value from the singly linked list.
Ans. 
Traverse the linked list to find the 2nd last node and return its value.
• Traverse the linked list while keeping track of the current and previous nodes.

• Once at the end of the list, return the value of the previous node.
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Q8. You have an array of integer and retrieve the 2 smallest number from it without sorting the array.
Ans. 
Use two variables to keep track of the smallest and second smallest numbers in the array.
• Iterate through the array and update the variables accordingly.

• Initialize the variables with the maximum possible integer value to start with.

• Example: array = [5, 2, 8, 1, 3], smallest = 1, secondSmallest = 2.
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Q1. Java questions and basics of testing
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Q1. Questions related Data Sctructure and Algorithms
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Q1. Questions related to Project and TechStack
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Q1. Behavioral questions were asked
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There was an online test which has MCQs. Had technical questions from java, microservices, springboot, rdbms

Q1. An unsorted array has numbers. Find the duplicate numbers and return the array.
Ans. 
Find duplicate numbers in an unsorted array and return the array.
• Iterate through the array and keep track of seen numbers using a hash table.

• If a number is already in the hash table, it is a duplicate.

• Add the duplicate number to a new array and return it.
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Q2. Java 8 features, method reference, write consumer, lambda expression. SOLID principles. Design patterns. Write thread safe singleton with performance.
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Q3. AWS related questions. SQS. Dynamo. AWS API gateway.
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Q4. REST principles.
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Q5. Inheritance tricky questions. Collections tricky questions.
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Q6. Deep copy vs Shallow copy.
Ans. 
Deep copy creates a new object with its own memory, while shallow copy creates a new reference to the same memory.
• Deep copy duplicates the object and all of its contents, while shallow copy only duplicates the object itself.

• Deep copy is more memory-intensive than shallow copy.

• In Python, deep copy can be achieved using the copy.deepcopy() method, while shallow copy can be achieved using the copy.copy() method.
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Q7. Comparator with and without java 8
Ans. 
Comparator in Java 8 provides default methods and lambda expressions for sorting.
• Comparator in Java 8 can be implemented using lambda expressions.

• Comparator in Java 8 provides default methods like reversed() and thenComparing() for sorting.

• Comparator in pre-Java 8 versions can be implemented using anonymous inner classes.

• Comparator in pre-Java 8 versions requires more code to implement compared to Java 8.

• Example: Sorti...read more
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2 coding questions and should complete one after another

60 min test with multiple choice questions

Q1. Live coding or some questions
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