Collabera Technologies React Js Frontend Developer Interview Questions and Answers

DSA

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Q1. Tell me about yourself.
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Q2. Very basic questions
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Round duration - 90 minutes
Round difficulty - Medium

We were supposed to give test in any time between 3 PM to 9 PM.

Q1. 
Total Unique Paths Problem Statement
You are located at point ‘A’, the top-left corner of an M x N matrix, and your target is point ‘B’, the bottom-right corner of the same matrix. Your task is to calcula...read more
Ans. 
The problem involves finding the total number of unique paths from the top-left to bottom-right cell of a matrix by moving only right or down.
• Use dynamic programming to solve the problem efficiently.

• Create a 2D array to store the number of unique paths at each cell.

• Initialize the first row and first column with 1 as there is only one way to reach them.

• For each cell (i, j), the number of unique paths is the sum of paths...read more
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Q2. 
Subtree Node Count Problem
We are provided with a tree containing 'N' nodes, numbered from 0 to N-1. The objective is to determine the total number of nodes within each subtree of the provided tree. Speci...read more
Ans. 
Given a tree with N nodes, find the number of elements in each subtree rooted at every node.
• Traverse the tree using Depth First Search (DFS) to calculate subtree sizes for each node.

• Use an array to store subtree sizes for each node, starting with leaf nodes having size 1.

• The subtree size of a node is the sum of subtree sizes of its children plus 1 for the node itself.
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Round duration - 120 minutes
Round difficulty - Medium

Pair Programming Interview( this round is similar to machine coding round) it started around 11 AM

Focus Areas: Problem solving and implementation of extensions.

The pair coding round is focused on OOPS concepts. You are paired with a TWer for this round. They let you code first for an hour and in the next hour they review your code and suggest changes which would improve the code structure, readability and make it modular and reusable and functional.
 

Q1. 
River Crossing: Help Ninja Cross Over
Ninja stands at the start of a wooden bridge over a river. Some segments of the bridge are damaged. The undamaged segments, marked as 'safe', are listed in an array S...read more
Ans. 
Check if Ninja can cross the river by jumping from one safe segment to another based on given constraints.
• Iterate through the 'SAFE' array and check if Ninja can make the required jumps to reach the last safe segment.

• Ensure that the next jump is either 'X' - 1, 'X', or 'X' + 1 units from the previous jump.

• Return 'true' if Ninja can successfully cross the river, otherwise return 'false'.
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Round duration - 120 minutes
Round difficulty - Medium

Students who were shortlisted from Pair Programming round was selected for this round around 3 PM. In this round there were two interviewer.

Q1. 
Middle of a Linked List
You are given the head node of a singly linked list. Your task is to return a pointer pointing to the middle of the linked list.
If there is an odd number of elements, return the ...read more
Ans. 
Return the middle element of a singly linked list, or the one farther from the head if there are even elements.
• Traverse the linked list with two pointers, one moving twice as fast as the other

• When the fast pointer reaches the end, the slow pointer will be at the middle

• Return the element pointed to by the slow pointer
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Q1. Questions on core java, Collections, Oops concepts
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Q1. Explain singleton design pattern
Ans. 
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 by providing a global access point to it

• Uses a private constructor to restrict instantiation of the class

• Provides a static method to access the single instance

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or configuration
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Q1. Basic CSS, Event Loop, Callback, promises, js programming, tricky questions
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Q1. Callback, clouser,
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Q1. Technical interview is depend on client
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Q1. Architecture of software
Ans. 
Software architecture refers to the high-level structures of a software system and the discipline of creating such structures.
• Software architecture defines the components, relationships, and interactions of a system.

• It involves making decisions about the organization of a system to meet specific requirements.

• Common architectural styles include client-server, layered, and microservices.

• Architectural patterns like MVC an...read more
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Q1. Basic Java Question
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Q2. Spring Boot related questions
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Q1. Design a rest API and code it.
Ans. 
Design and code a REST API for a software developer interview.
• Define the endpoints and HTTP methods for the API (e.g. GET /users, POST /users)

• Implement authentication and authorization mechanisms (e.g. JWT tokens)

• Use proper status codes for responses (e.g. 200 OK, 401 Unauthorized)

• Include error handling and validation for input data

• Document the API using tools like Swagger or OpenAPI
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Q2. Questions related to JPA HIBERNATE SQL
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Q1. Discussion related to Last company Project and architecture level questions
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Q2. Write code to calculate frequency of a word using Stream API and lambda expressions
Ans. 
Calculate word frequency using Stream API and lambda expressions
• Use Stream API to convert array of strings to stream

• Use Collectors.groupingBy to group words by their frequency

• Use Collectors.counting to count the occurrences of each word
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Q1. Write SELECT query as per requirement
Ans. 
Write SELECT query as per requirement
• Understand the requirement and identify the tables to be queried

• Select the columns to be retrieved

• Apply filters and sorting as per requirement

• Use joins if necessary

• Test the query for accuracy
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Q2. Pseudo code for the ALV
Ans. 
ALV is a tool used to display data in tabular form in SAP systems.
• ALV stands for ABAP List Viewer

• It is used to display data in a tabular format

• It provides various features like sorting, filtering, grouping, etc.

• ALV can be used in both interactive and batch processing modes
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Q3. Difference between Domain and Data element
Ans. 
Domain refers to a specific area of knowledge or expertise, while data element is a single piece of information within a domain.
• Domain is a broader concept that encompasses multiple data elements.

• Data element is a specific piece of information within a domain.

• For example, in the domain of medicine, 'patient name' and 'blood pressure' are data elements.

• While the domain itself is 'medicine' which includes various data el...read more
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Q4. What is the use of TMG
Ans. 
TMG stands for Threat Management Gateway. It is a network security tool used for web protection, firewall, and VPN.
• TMG provides protection against malware, viruses, and other online threats.

• It can be used as a firewall to control network traffic and prevent unauthorized access.

• TMG also offers VPN connectivity for remote access to the network.

• It is commonly used in enterprise environments for secure web access and netwo
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Q1. Projects I have worked on
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Q2. What is your job role
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Q3. What all parts of software development you were part of
Ans. 
I have been part of various stages of software development including requirements gathering, design, development, testing, and deployment.
• Participated in requirement gathering sessions with clients to understand their needs

• Contributed to the design phase by creating technical specifications and architecture diagrams

• Developed software using various programming languages and frameworks

• Performed unit testing and integrati...read more
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Q1. Previous salary
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Q2. What is expectation
Ans. 
Expectation is a belief or hope about something that is likely to happen in the future.
• Expectation is a mental state that involves anticipating a certain outcome or result.

• It can be based on past experiences, assumptions, or predictions.

• Expectations can be realistic or unrealistic, and can lead to disappointment or satisfaction depending on the outcome.

• For example, a student may have the expectation of getting an A on ...read more
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Level of question good

Level of coding questions from moderate to hard