Quest Global Senior Software Developer Interview Questions and Answers

Q1. Microservice Architecture
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Q2. Rest api vs soap api
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REST API is lightweight, flexible, and widely used, while SOAP API is more rigid and heavy.
• REST API uses standard HTTP methods like GET, POST, PUT, DELETE, while SOAP API uses XML for communication.

• REST API is stateless and can be cached, making it faster, while SOAP API is stateful and requires more bandwidth.

• REST API is easier to implement and understand, while SOAP API has more built-in security features.

• Examples: R
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Questions from Resume, solving code snippets, DSA Algo

Q1. Explain GCD, Core Data, Higher Order Functions, ARC
Ans. 
GCD, Core Data, Higher Order Functions, ARC are key concepts in iOS development.
• GCD (Grand Central Dispatch) is a technology for managing concurrent operations.

• Core Data is a framework for managing the model layer objects in an application.

• Higher Order Functions are functions that operate on other functions, taking them as arguments or returning them.

• ARC (Automatic Reference Counting) is a memory management technology
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Q2. Weak Unowned, iOS App States
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Q1. Http1.1 vs 2.0 vs 3.0
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HTTP/1.1 is the older version with persistent connections, HTTP/2.0 introduces multiplexing and server push, and HTTP/3.0 uses QUIC protocol for faster performance.
• HTTP/1.1 uses persistent connections for each request/response, leading to potential performance issues.

• HTTP/2.0 introduces multiplexing, allowing multiple requests/responses to be sent over a single connection simultaneously.

• HTTP/2.0 also supports server pu...read more
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Q2. Print all the possible subsets from a given slice of integers
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Print all possible subsets from a given slice of integers
• Use recursion to generate all possible subsets

• For each element in the slice, include or exclude it in the subset

• Keep track of the current subset being generated
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Q3. Questions on GRPC implementation
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Q4. About code profiling
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Q5. What is context package in golanguage
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Context package in Go language provides a way to pass around deadlines, cancellation signals, and other request-scoped values.
• Context package is used to manage deadlines, cancellation signals, and request-scoped values in Go programs.

• It allows passing data between function calls without having to pass them explicitly as arguments.

• Context package is commonly used in web servers to manage request-specific data and timeou...read more
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Q6. RestApi vs GRPC
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REST API is a standard protocol for web services using HTTP, while gRPC is a high-performance, open-source RPC framework.
• REST API uses HTTP for communication, making it easy to implement and widely supported.

• gRPC is a modern, high-performance RPC framework that uses HTTP/2 for transport and Protocol Buffers for serialization.

• gRPC is more efficient in terms of performance and supports features like bidirectional streami...read more
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Q1. How to copy slice element and reflect the new changes done in original slice to new slice
Ans. 
Use copy() function to create a new slice and reflect changes in original slice to the new slice.
• Use the copy() function to create a new slice with the same length as the original slice.

• Make changes to the original slice.

• The changes made to the original slice will automatically reflect in the new slice as well.
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Q2. How do you handle panic in golang
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Q3. Why golang is best compared to other languages
Ans. 
GoLang is best for its simplicity, efficiency, concurrency support, and strong community backing.
• Efficient performance due to compiled nature and garbage collection

• Concurrency support with goroutines and channels

• Strong standard library with built-in support for networking, encoding, and more

• Simple and clean syntax that promotes readability and maintainability

• Growing community and ecosystem with popular frameworks like
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Q4. Explain Kubertnetes Architecture
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Kubernetes is an open-source container orchestration platform for automating deployment, scaling, and management of containerized applications.
• Kubernetes follows a master-slave architecture with a master node controlling multiple worker nodes.

• Master node components include API server, scheduler, controller manager, and etcd.

• Worker node components include kubelet, kube-proxy, and container runtime (e.g. Docker).

• Kubernet...read more
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Q1. What is dependancy Injection?
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Dependency Injection is a design pattern where the dependencies of a class are provided from the outside rather than created within the class itself.
• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between classes

• Improves code reusability and maintainability

• Commonly implemented using frameworks like Spring in Java
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Q2. How We maintain security in Application?
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Maintaining security in applications involves implementing encryption, authentication, authorization, and regular security audits.
• Implement encryption to protect data in transit and at rest

• Use strong authentication mechanisms like multi-factor authentication

• Implement proper authorization controls to restrict access to sensitive data

• Regularly conduct security audits and penetration testing to identify vulnerabilities
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Q1. Project related questions, database basic questions, python basics
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Q1. Regarding SQL i Cleared my Test
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Q2. What is CTE ? And Write a Sample Query ?
Ans. 
CTE stands for Common Table Expressions, used to create temporary result sets within a SQL query.
• CTE is defined using the WITH keyword in SQL.

• It helps in simplifying complex queries by breaking them into smaller, more manageable parts.

• CTEs can reference themselves recursively, making them useful for hierarchical data.

• Example: WITH cte AS (SELECT * FROM table_name) SELECT * FROM cte;
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Q3. Print Numbers between 1 to 20 , even/odd numbers
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Print even and odd numbers between 1 to 20.
• Iterate from 1 to 20 and check if the number is even or odd.

• Use a conditional statement to determine if the number is even or odd.

• Print the number along with its type (even or odd).
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Q1. Max of the Questions which interviewer was asked i answered well
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Q1. Java and spring boot questions
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Q2. Sort the array in ascending order
Ans. 
Sorts an array of strings in ascending order.
• Use a sorting algorithm like bubble sort, insertion sort, or quicksort.

• Compare adjacent elements and swap them if they are in the wrong order.

• Repeat the process until the array is sorted.
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Q3. Java collections questions
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Q4. Project agile , cicdpipeline
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Q1. Brush up java and spring and sorting questions
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