Delta Air Lines Senior Software Engineer Interview Questions and Answers

Q1. What is the internal implementation of Hashing and what is collision?
Ans. 
Hashing is a technique used to map data to a fixed-size array, collision occurs when two different inputs produce the same hash value.
• Hashing involves using a hash function to map data to a fixed-size array.

• Collision happens when two different inputs produce the same hash value.

• Common techniques to handle collisions include chaining and open addressing.
Answered by AI
Add your answer
Q2. Is time complexity of HashMap always O(1) ?
Ans. 
No, time complexity of HashMap is not always O(1).
• Time complexity of HashMap is O(1) on average, but can degrade to O(n) in worst case scenarios.

• Worst case scenarios include hash collisions, which can lead to linear probing and degrade performance.

• Load factor and capacity of the HashMap can also affect time complexity.

• In scenarios where many keys hash to the same index, the time complexity can degrade.
Answered by AI
Add your answer

Q1. Yet to have the interview. Ambition box is forcefully making me enter these details
Add your answer

Q1. About sdlc stlc manual testing topics
Add your answer

Q1. Coding, few automation topics
Add your answer

Q1. General topics discussion
Add your answer

Q1. Salary Discussion
Add your answer

Q1. Diff btwn const and readonly
Add your answer
Q2. Diff btwn SP and Functions
Add your answer
Q3. Difference between Truncate and Delete?Which is faster and why?
Add your answer
Q4. What is Liskov Substitution Principle
Add your answer

1 dsa question 1 sql and 18 mcq questions

Q1. Lot of questions from resumes and projects
Add your answer
Q2. Easy DSA questions and oops questions
Add your answer

Q1. How js async working
Ans. 
JavaScript async allows non-blocking code execution by using Promises or async/await syntax.
• Async functions return a Promise object.

• Promises represent a value that may be available now, in the future, or never.

• Async/await syntax simplifies asynchronous code by using keywords async and await.

• Callbacks can also be used for handling asynchronous operations.
Answered by AI
Add your answer

Q1. Node js working in detail
Ans. 
Node.js is a runtime environment that allows you to run JavaScript on the server side.
• Node.js is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.

• Node.js is commonly used for building server-side applications, APIs, and real-time applications.

• It has a large ecosystem of libraries and frameworks, such as Express.js and Socket.io.
Answered by AI
Add your answer
Q2. Timer working in node
Ans. 
In Node.js, timers can be implemented using functions like setTimeout() and setInterval().
• Use setTimeout() to execute a function once after a specified delay

• Use setInterval() to execute a function repeatedly at a specified interval

• Clear a timer using clearTimeout() or clearInterval()

• Example: setTimeout(() => { console.log('Timer executed!'); }, 2000);
Answered by AI
Add your answer

Q1. HLD questions on db and backend
Add your answer
Q2. Relational non relational db
Add your answer

Q1. Common technical questions
Add your answer

Q1. Advance Technical Questions based on your skill set taken by architect
Add your answer

Common coding problems difficulty laver moderate

Q1. Common managerial question ,scenario base questions
Add your answer

Q1. About sdlc stlc manual testing topics
Add your answer

Q1. Coding, few automation topics
Add your answer

Q1. General topics discussion
Add your answer

Q1. Salary Discussion
Add your answer