United Airlines Software Developer II Interview Questions and Answers

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.
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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);
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Q1. HLD questions on db and backend
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Q2. Relational non relational db
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Q1. About sdlc stlc manual testing topics
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Q1. Coding, few automation topics
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Q1. General topics discussion
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Q1. Salary Discussion
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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.
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15 analytical questions - 20min

20 questions based on C and C++ - 20min

Q1. 15 questions based on digital electronics - 20min
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SDLC, Core Programming Langage, Agile, Architectures

Q1. Mostly Related to technology u r working on.
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Q1. Difference between Virtual DOM and DOM
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, used for efficient updates in web applications.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• Changes are first made to the Virtual DOM, then compared with the actual DOM to determine the minimal updates needed.

• This process reduces the number of expensive DOM operations, resulting in faster renderi
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Q2. Difference between Angular and React
Ans. 
Angular is a full-fledged framework for building web applications, while React is a JavaScript library for building user interfaces.
• Angular is a complete framework with built-in features like routing, forms, and HTTP client.

• React is a library focused on building UI components and managing state.

• Angular uses two-way data binding, while React uses one-way data flow.

• Angular uses TypeScript by default, while React uses Jav...read more
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Related experiences and roles about the project with used DO178c