CapitalOne Softwaretest Engineer Interview Questions and Answers

Q1. A brief Introduction
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Q2. Past Experience Discussion
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Q1. Data Structures and Algorithms questions
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Q2. SQL and OOPS concept questions
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Q1. Project discussion
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Q2. Data Structure and Algorithms questions
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Q3. SQL concepts questions
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Q1. Diff between react and jQuery
Ans. 
React is a modern JavaScript library for building user interfaces, while jQuery is a fast and concise JavaScript library for DOM manipulation.
• React is component-based, promoting reusability and modularity.

• React uses a virtual DOM for efficient updates, while jQuery directly manipulates the DOM.

• React is declarative, making it easier to reason about the UI, while jQuery is imperative.

• React is typically used for single-pa...read more
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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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Q1. Internal Implementation of HashMap
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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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Javascript,html, CSS and MySQL

Q1. Basic NodeJs and MySQL questions,scenario-based technical questions and basic interview questions
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Q2. What is an event loop, The second highest from the table
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An event loop is a programming construct that waits for and dispatches events or messages in a program.
• Event loop is commonly used in asynchronous programming to handle tasks like I/O operations without blocking the main thread.

• It continuously checks for events in a queue and processes them one by one.

• Examples of event loops include Node.js event loop for handling asynchronous operations in JavaScript.

• Event loop helps ...read more
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Q1. Basic nodejs and SQL queries question
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Q1. Basic interview question and technology based
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Q1. In this round ask most of the question from string manipulation. It is a DSA round
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Q2. Frequency of each character
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The frequency of each character in a given string is calculated and displayed.
• Iterate through the string and count the occurrences of each character

• Store the counts in a data structure like a hashmap or array

• Return the frequency of each character
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Q1. In this ask about your salary expectation. DSA question DBMS Shellscript
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Q2. DBMS join query
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