Easiloan Techno Solutions SDE (Software Development Engineer) Interview Questions and Answers

3 dsa questions medium level

Q1. 2 medium level dp questions based on string and stocks
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Q2. One hard question based on graph
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Q1. Hr questions and java , springboot questions etc
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Technical Aptitude on singalton pattern

Q1. What is man in middle attack?
Ans. 
A man-in-the-middle attack is a cyber security attack where the attacker secretly intercepts and possibly alters the communication between two parties.
• Attacker intercepts communication between two parties

• Attacker may alter the communication

• Commonly occurs in public Wi-Fi networks

• Can lead to data theft or unauthorized access
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Q2. How to protect api?
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Protecting API involves using authentication, authorization, encryption, rate limiting, and monitoring.
• Implement authentication mechanisms such as OAuth, JWT, or API keys

• Use authorization to control access to different parts of the API

• Encrypt sensitive data using SSL/TLS

• Implement rate limiting to prevent abuse and protect against DDoS attacks

• Monitor API traffic for unusual activity and potential security threats
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Q3. Whats is csrf ?
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CSRF stands for Cross-Site Request Forgery, a type of attack where a malicious website tricks a user into performing actions on another website without their knowledge.
• CSRF attacks exploit the trust that a site has in a user's browser, by sending unauthorized requests using the user's session.

• Prevent CSRF attacks by using tokens in forms, checking the origin of requests, and implementing proper authentication and autho...read more
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Q1. Why you want ti join airpay?
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Q2. Why you leave current organisation?
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Q1. 2Sum DSA leetcode problem
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2Sum problem involves finding two numbers in an array that add up to a specific target.
• Use a hashmap to store the difference between the target and each element in the array.

• Iterate through the array and check if the current element's complement exists in the hashmap.

• Return the indices of the two numbers that add up to the target.
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Q2. Spiral traversal of a Binary tree
Ans. 
Spiral traversal of a Binary tree involves visiting nodes level by level alternating between left to right and right to left.
• Start by pushing the root node into a queue.

• While the queue is not empty, pop a node, print its value, and push its children into the queue.

• Alternate between popping nodes from the queue and printing their values in a spiral manner.
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Q1. A problem similar to coin change problem of leetcode
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Q2. Aggressive cows problem
Ans. 
The aggressive cows problem involves finding the maximum distance between cows in a field while ensuring they are not too close to each other.
• Use binary search to find the maximum distance between cows.

• Sort the cows' positions and check if a certain distance is feasible.

• Consider the constraints of the problem such as the number of cows and the size of the field.
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Q1. Basic behavioural questions like why I am looking for a change and would I be able to handle the increased work pressure as I was shifting from MNC to a startup
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Q1. Design and implement LRU cache?
Ans. 
LRU cache is a data structure that maintains the least recently used items in memory for efficient access.
• Use a combination of a doubly linked list and a hashmap to store and access the cache items.

• When a new item is accessed, move it to the front of the linked list to mark it as the most recently used.

• If the cache is full, remove the least recently used item from the end of the linked list and the hashmap.
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Coding and aptitude round

Q1. Tree dsa questions
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Q1. Horse race question
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Q1. Location specific question
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Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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Q1. Projects, previous work , dsa and database
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Q1. System design , dsa
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Q1. Behavioural, system design
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Q1. General discussion , salary
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Q1. What is Jmeter and what is used of it?
Ans. 
JMeter is a load testing tool used to measure the performance of web applications.
• JMeter can simulate heavy loads on a server, allowing testers to identify performance bottlenecks.

• It can be used to test the performance of web applications, FTP servers, databases, and more.

• JMeter can generate reports and graphs to help analyze test results.

• It supports various protocols including HTTP, FTP, JDBC, SOAP, and more.

• JMeter ca...read more
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Q2. What is Defect life cycle?
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Defect life cycle is the process of identifying, reporting, prioritizing, fixing, and verifying defects in software.
• Defect is identified by testers during testing or reported by users

• Defect is logged in a defect tracking tool with details like severity, priority, etc.

• Defect is assigned to a developer for fixing

• Developer fixes the defect and marks it as resolved

• Tester verifies the fix and either closes the defect or reo...read more
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Q3. How to do Integration of excel in Jmeter?
Ans. 
Integration of Excel in JMeter can be done using the Apache POI library.
• Download and add the Apache POI library to JMeter's classpath.

• Create a Test Plan and add a Thread Group.

• Add a Sampler and choose the appropriate request type.

• Add a Listener and choose the appropriate output format.

• Use the POI classes to read or write data to Excel files.

• Use JMeter variables to pass data between requests.
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Q4. What is xpath locator?
Ans. 
Xpath locator is a way to locate elements in HTML/XML documents using path expressions.
• Xpath is a language used to navigate through elements and attributes in an XML document

• It uses path expressions to select nodes or sets of nodes in an XML document

• Xpath locators can be used in automated testing to locate elements on a web page

• Example: //input[@id='username'] selects the input element with id='username'
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To generate 5000 data in Excel and import in Jmeter, then fetch the data from excel and apply in post Api's request body.

Q1. What is postman and API?
Ans. 
Postman is a tool for testing APIs. An API is a set of protocols that allows communication between different software applications.
• Postman allows developers to test APIs by sending requests and receiving responses.

• API stands for Application Programming Interface and is a set of rules that allows different software applications to communicate with each other.

• APIs can be used to retrieve data from a server, update data o...read more
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Q2. Can we use only one method for all operations in API?
Ans. 
No, different methods are required for different operations in API.
• Different methods are required for different HTTP verbs like GET, POST, PUT, DELETE.

• Methods should be designed to perform specific actions like fetching data, updating data, etc.

• Using a single method for all operations can lead to confusion and errors.

• For example, using GET method for updating data can cause security issues.
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Q3. How to do UI automation?
Ans. 
UI automation can be done using tools like Selenium, Appium, and TestComplete.
• Identify the elements to be automated

• Choose the appropriate tool for the technology stack

• Write test scripts using the tool's API

• Execute the scripts and analyze the results

• Maintain the scripts as the UI changes
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Q4. What is database testing?
Ans. 
Database testing is the process of verifying the data stored in the database and ensuring its accuracy, completeness, and security.
• It involves testing the database schema, data integrity, data validation, and performance.

• Testers use SQL queries to retrieve and manipulate data for testing purposes.

• Database testing can be automated using tools like Selenium, JMeter, and TestComplete.

• Examples of database testing include t...read more
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Q5. Can you explain any one of your project?
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Q6. What is security testing?
Ans. 
Security testing is the process of identifying vulnerabilities and weaknesses in a software system to prevent unauthorized access.
• It involves testing the system for confidentiality, integrity, authentication, authorization, and availability.

• Common security testing techniques include penetration testing, vulnerability scanning, and risk assessment.

• Examples of security testing tools include Burp Suite, OWASP ZAP, and Nes...read more
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