Sigmoid Software Engineer Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on CSS and Jquery mainly.

Q1. What is the CSS box model?
Ans. 
The CSS box model is a design and layout concept that defines the structure and sizing of elements on a web page.
• It consists of content, padding, border, and margin around an element.

• Content area is where text and images are displayed.

• Padding is the space between the content and the border.

• Border is the line that goes around the padding and content.

• Margin is the space outside the border.

• Example: div { width: 200px; pad...read more
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Q2. How do you select all div elements using jQuery?
Ans. 
To select all div elements using jQuery, use the selector $('div').
• Use the jQuery selector $('div') to select all div elements on the page.

• You can also use the find() method to select div elements within a specific parent element.

• To perform actions on the selected div elements, use jQuery methods like css(), text(), or addClass().
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Q3. How can you change the background color of all items in JavaScript?
Ans. 
You can change the background color of all items in JavaScript by selecting all elements and setting their background color property.
• Select all elements using document.querySelectorAll()

• Loop through the selected elements and set their style.backgroundColor property

• Example: document.querySelectorAll('.item').forEach(item => item.style.backgroundColor = 'blue');
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on Java mainly.

Q1. What are the uses of the final keyword in Java?
Ans. 
The final keyword in Java is used to define constants, prevent method overriding, and make a class immutable.
• Final variables cannot be reassigned once initialized

• Final methods cannot be overridden in subclasses

• Final classes cannot be extended
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Q2. What is the Front Controller in Spring MVC?
Ans. 
Front Controller in Spring MVC is a design pattern that handles all requests and acts as a central point of control.
• Front Controller is a servlet in Spring MVC that receives all requests and then dispatches them to the appropriate handlers.

• It helps in centralizing request handling logic, improving code organization and reducing duplication.

• Front Controller can perform tasks like authentication, logging, exception handl...read more
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Q3. What is the annotation for request mapping in Java?
Ans. 
The annotation for request mapping in Java is @RequestMapping.
• @RequestMapping annotation is used to map web requests to specific handler methods in Spring MVC.

• It can be applied at class level or method level to specify the URL path that the controller will handle.

• You can also specify HTTP request methods, headers, parameters, and more using @RequestMapping.
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Q4. What is the annotation used for a controller in Java?
Ans. 
The annotation used for a controller in Java is @RestController.
• Used to define a class as a controller in Spring MVC

• Automatically serializes return objects into JSON/XML responses

• Equivalent to @Controller + @ResponseBody annotations
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Round duration - 30 minutes
Round difficulty - Easy

This was a typical HR round.

Round duration - 90 minutes
Round difficulty - Easy

Q1. 
Reverse Linked List Problem Statement
Given a singly linked list of integers, return the head of the reversed linked list.
Example:
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...read more
Ans. 
Reverse a singly linked list of integers and return the head of the reversed linked list.
• Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

• Use three pointers to keep track of the current, previous, and next nodes while reversing the linked list.

• Update the head of the reversed linked list as the last node encountered during the reversal process.
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Round duration - 60 minutes
Round difficulty - Easy

Q1. You have a puzzle involving 4 liters of water. Can you describe the details of this puzzle?
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Round duration - 40 minutes
Round difficulty - Easy

Q1. You were given CSS code and asked to debug it to make the functionality work. Can you describe the process you followed and the issues you encountered?
Ans. 
I followed a systematic process to debug CSS code and resolve functionality issues.
• Reviewed the CSS code to identify any syntax errors or typos

• Checked for any conflicting styles that may be overriding the desired functionality

• Used browser developer tools to inspect elements and troubleshoot layout issues

• Tested different scenarios to pinpoint the exact cause of the problem

• Made necessary adjustments to the CSS code to fi
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Online coding test with Sql and python questions

Q1. Details about project and experience
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Q2. Pyspark and databricks questions
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Q3. What is Spark context
Ans. 
Spark context is the main entry point for Spark functionality and represents the connection to a Spark cluster.
• Main entry point for Spark functionality

• Represents connection to a Spark cluster

• Used to create RDDs, broadcast variables, and accumulators
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Q4. 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 inherits properties and behaviors of the base class

• Supports the concept of polymorphism and encapsulation

• Example: Class 'Car' can inherit from class 'Vehicle' and inherit its attributes like 'color' and met
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Q5. What is sparkconfig
Ans. 
SparkConfig is a configuration object used in Apache Spark to set various parameters for Spark applications.
• SparkConfig is used to set properties like application name, master URL, and other Spark settings.

• It is typically created using SparkConf class in Spark applications.

• Example: val sparkConf = new SparkConf().setAppName("MyApp").setMaster("local")
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Q1. 2 sum problem on number
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Q1. Json data manipulation
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Q1. Normal hr question
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Round duration - 120 minutes
Round difficulty - Easy

After round 1 there was a break of 15 mins and the coding round started.
We had a choice to attempt the exam in R language & SQL or python & sql
I chose python and sql
It had 8 questions 4 python and 4 sql

Q1. 
Longest Common Subsequence Problem Statement
Given two strings, S and T with respective lengths M and N, your task is to determine the length of their longest common subsequence.
A subsequence is a seque...read more
Ans. 
The task is to find the length of the longest common subsequence between two given strings.
• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the lengths of longest common subsequences of substrings.

• Iterate through the strings to fill the array and find the length of the longest common subsequence.

• Example: For strings 'abcde' and 'ace', the longest common subsequence is 'ace' with leng
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Round duration - 15 minutes
Round difficulty - Medium

The interview was mostly analytical based and how you approach the round a few technical questions in dbms and oops were also asked.

Round duration - 20 Minutes
Round difficulty - Medium

Similar to first round
For Shortlists after elimination from first round.

Q1. 
Car Pooling Capacity Problem
You are a cab driver with a car that initially has 'C' empty seats. The car moves in a straight line towards the forward direction only. Your job is to determine if it is poss...read more
Ans. 
Determine if it is possible to accommodate all passenger trips within a car's capacity without exceeding it at any point.
• Iterate through each trip and keep track of the total number of passengers in the car at each point.

• Check if the total number of passengers exceeds the car capacity at any point.

• Return 'True' if all trips can be accommodated within the car capacity, otherwise return 'False'.
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Round duration - 20 minutes
Round difficulty - Easy

After two technical round interviews, the last round was a hr interview. The whole process can take up one whole day or more and your interview can be at any time
My process started at 5 pm and ended at 10:30 pm
All the interviewers were very friendly no pressure.

Q1. 
Nth Fibonacci Number Problem Statement
Calculate the Nth term in the Fibonacci sequence, where the sequence is defined as follows: F(n) = F(n-1) + F(n-2), with initial conditions F(1) = F(2) = 1.
Input:
...read more
Ans. 
Calculate the Nth Fibonacci number efficiently using dynamic programming.
• Use dynamic programming to store previously calculated Fibonacci numbers to avoid redundant calculations.

• Start with base cases F(1) and F(2) as 1, then iterate to calculate subsequent Fibonacci numbers.

• Time complexity can be optimized to O(N) using dynamic programming.

• Example: For N = 5, the 5th Fibonacci number is 5.
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