Trackpi Software Developer Interview Questions and Answers

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Q1. Remove the last element from a linkedlist
Ans. 
To remove the last element from a linked list, iterate to the second last node and update its next pointer to null.
• Iterate through the linked list to find the second last node

• Update the next pointer of the second last node to null
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Q2. Some basic questions on oops dbms and os
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Q1. Asked about technologies and coding
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Q2. Components in reactjs
Ans. 
Reactjs components are reusable, independent pieces of UI that can be composed together to build complex user interfaces.
• Components are the building blocks of a React application

• They can be class components or functional components

• Components can have their own state and lifecycle methods

• Components can be nested within other components to create a hierarchy

• Examples: Button component, Navbar component, UserList component
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Q3. Given url to fetch data from api
Ans. 
Use the url to make a request to the API and fetch data.
• Use a library like axios or fetch to make the HTTP request.

• Parse the response data to extract the necessary information.

• Handle any errors that may occur during the request.
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Q4. Cloud related scenerio questions
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Simple question on maths

Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation ensures that the internal state of an object is hidden from the outside world

• Inheritance allows a class to inherit...read more
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Q2. Coding array questions
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Q1. Write delete query in Mongodb
Ans. 
Delete query in MongoDB removes documents from a collection based on specified criteria.
• Use the 'deleteMany' method to delete multiple documents matching a filter

• Use the 'deleteOne' method to delete a single document matching a filter

• Specify the filter criteria to identify the documents to be deleted
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Q2. Explain Java oops concepts
Ans. 
Java oops concepts include inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction hides the implementation details and only shows the necessary features to
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Q3. Asked about Java development
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Contains linear and non linear data structures deep knowledge of trees and graphs

Q1. Able to do dry run on page
Ans. 
Dry run on a page involves testing the code without actually executing it.
• Dry run involves walking through the code manually to check for errors

• Helps in identifying logic errors before actual execution

• Commonly used in debugging and testing code
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Q1. What is your current salary
Ans. 
I am unable to provide my current salary.
• I am unable to disclose my current salary due to confidentiality agreements.

• My current salary is subject to a non-disclosure agreement.

• I prefer not to discuss my current salary during the interview process.
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Q2. What is your experience
Ans. 
I have 5 years of experience as a Software Developer.
• Developed web applications using HTML, CSS, and JavaScript.

• Worked with various programming languages such as Java, C++, and Python.

• Experience in database management with SQL and NoSQL.

• Familiar with Agile development methodologies.

• Collaborated with cross-functional teams to deliver high-quality software solutions.
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Design and implement a least recently used (LRU) cache mechanism that supports `get` and `put` operations.

Q1. Regarding the Past Projects, mine were with Firebase and Flutter.
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Q2. Medium DSA questions for Array and String and Flutter
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