ClearTrail Technologies Software Engineer Interview Questions and Answers

Starts with an online assessment test on HackerRank. Expect a LeetCode Medium question most of the time, mostly created by HackerRank.

Q1. LC medium related to dynamic programming.
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Q2. LC easy related to heaps.
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Q1. LC medium-hard, don't remember the category.
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Q1. This was a design round. You can expect to be asked to design the DB schema and API endpoints for a well-known use case. Interviewer was super helpful and receptive throughout. While getting to an agreeabl...read more
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Q1. Hiring manager round. Mostly discussions about your profile, discussion on past projects from your resume. You can do well in this round if you know your basics and can explain your projects to some depth....read more
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Q1. Reverse a linked list
Ans. 
Reverse a linked list by changing the direction of pointers
• Start with three pointers: current, previous, and next

• Iterate through the linked list, updating pointers to reverse the direction

• Update the head of the linked list to be the last node visited
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Q1. What is promise
Ans. 
A promise is an object representing the eventual completion or failure of an asynchronous operation.
• Promises are used in JavaScript to handle asynchronous operations.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and failure callbacks.

• Example: Fetching data from an API returns a promise that resolves with the data or rejects with an error.
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Q2. What is hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable and function declarations are hoisted to the top of their scope.

• Only declarations are hoisted, not initializations.

• Function declarations take precedence over variable declarations.
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Q1. What is event loop
Ans. 
Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for and handling events.
• Event loop is commonly used in JavaScript to handle asynchronous operations like setTimeout, setInterval, and AJAX requests.

• It allows for non-blocking I/O operations, ensuring that the program can continue running while waiting for I/O operations to complete.

• Event loop works by contin...read more
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Q1. Polyfills , basic react app
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Q1. Question on DSA, Trees
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Carbon footprint and ways to achieve

1. which data structure is used to create an editor?

Basic grammer, maths questions,

Q1. Basic questions on programming languages
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Q2. Oops concepts, collections, method overloading, method overriding
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Q1. Tell me about your self?
Ans. 
I am a software engineer with experience in developing and maintaining software applications.
• Proficient in programming languages such as Java, C++, and Python

• Experience in developing web applications using frameworks like Spring and Django

• Strong problem-solving and analytical skills

• Familiarity with version control systems like Git

• Ability to work in a team and collaborate effectively
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Q2. What is your salary expectations?
Ans. 
I am open to discussing salary based on the responsibilities and requirements of the position.
• I am flexible and open to negotiation.

• I am looking for a competitive salary based on my skills and experience.

• I am interested in discussing the overall compensation package, including benefits and bonuses.

• I am open to considering other forms of compensation, such as stock options or profit sharing.

• I would like to learn more ab...read more
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Matrix and logical assigment questions

Coding question on DSA