Kaleidofin Software Development Engineer II Interview Questions and Answers

Q1. Asked about my experience as an integration developer
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It was a simple assignment where you needed to implement a Django app from a well laid out documentation.

Q1. Binary Search Tree - Two nodes are swapped in a Binary Search tree and then fix them so that the tree becomes a valid BST
Ans. 
Fix two swapped nodes in a Binary Search Tree to make it valid
• Identify the two nodes that are swapped incorrectly

• Perform an inorder traversal to find the nodes that are not in ascending order

• Swap the values of the incorrectly swapped nodes to fix the BST
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Q1. They concentrate on Core java
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Q2. 1. Polymorphism 2. Strings 3. hashMap implementation
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Q1. What is useState in react?
Ans. 
useState is a hook in React that allows functional components to have state.
• useState is used to declare state variables in functional components.

• It returns an array with two values: the current state value and a function to update it.

• The initial state can be passed as an argument to useState.

• Example: const [count, setCount] = useState(0);
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Q2. What is useEffect in react?
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useEffect is a hook in React that allows you to perform side effects in functional components.
• It replaces componentDidMount, componentDidUpdate, and componentWillUnmount.

• It takes two arguments: a function that performs the side effect and an array of dependencies.

• The function is called after every render, unless the dependencies haven't changed.

• Common use cases include fetching data, setting up event listeners, and upd
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Q3. Given a react problem and tell me to find the bug over there.
Ans. 
To find a bug in a React problem
• Check the console for any error messages

• Use React Developer Tools to inspect the component tree and state

• Check if the props and state are being updated correctly

• Check if the lifecycle methods are being called in the correct order

• Check if the event handlers are bound correctly

• Check if the JSX syntax is correct
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Q4. Ask about basic JS questions.
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Q5. Ask about basic CSS ideas.
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Q1. There was a total of 5 rounds, where 4 rounds were technical-based only (VP round is included) and the final round with the co-founder only which is similar to the HR or managerial round.
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Q1. An medium level hld question
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- There were 2 had questions majorly about DP, code link was shared.

Q1. Technical question regarding js
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