DBS Bank Full Stack Developer Interview Questions and Answers

A typical HackerRank technical test.

Q1. What is transactional annotation in spring ?
Ans. 
Transactional annotation in Spring is used to define the scope of a transaction.
• Transactional annotation is used to mark a method or a class as transactional.

• It ensures that all the operations within the annotated method or class are executed within a single transaction.

• If an exception occurs, the transaction is rolled back.

• Transactional annotation can be applied at the method level or class level.

• It provides various a...read more
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Q2. What is cache in spring?
Ans. 
Cache in Spring is a mechanism to store frequently accessed data in memory for faster retrieval.
• Cache improves application performance by reducing the load on the database.

• Spring provides caching support through annotations like @Cacheable, @CachePut, and @CacheEvict.

• Caches can be configured with different eviction policies, such as LRU or FIFO.

• Example: @Cacheable annotation can be used to cache the result of a method
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Q3. It stores the data in cache, where checks the dup
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Round duration - 30 minutes
Round difficulty - Medium

It was in the morning. We had to complete 1 coding question in given time limit

Q1. 
Most Frequent Non-Banned Word Problem Statement
Given a paragraph consisting of letters in both lowercase and uppercase, spaces, and punctuation, along with a list of banned words, your task is to find th...read more
Ans. Brute Force
1. To find the frequency of each word we need to extract the words from the paragraph.
2. So we will convert all the punctuation to space in the paragraph and lowercase alphabets to uppercase.
3. Now we can use the library function (e.g sstream in C++) to extract words from the paragraph in an array of strings say WORDS.
4. We will iterate over WORDS and do:
   1. Iterate over the banned array and check if the current word is pre...read more
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Round duration - 60 minutes
Round difficulty - Hard

Interviewer was friendly. He asked 2 coding questions and some fullstack questions. 

Q1. 
Ways To Make Coin Change
Given an infinite supply of coins of varying denominations, determine the total number of ways to make change for a specified value using these coins. If it's not possible to make...read more
Ans. Recursion
 
1. The idea is to use recursion.
2. For a particular coin, we have two options either include it or exclude it.
3. If we include that coin, then calculate the remaining number that we have to generate so recur for that remaining number.
4. If we exclude that coin, then recur for the same amount that we have to make.
5. Our final answer would be the total number of ways either by including or excluding.
6. There will be two edg...read more
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Q2. 
The Skyline Problem
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette when viewed from a distance. Each building is ...read more
Ans. Brute Force
The idea here is to first, sort the critical POINTS with respect to their coordinate and height pairs. Make a pair of 'X1' and take a negative of the height for the building so that 'X1' pairs are sorted before 'X2' pairs. Create a dictionary keeping the heights as keys and as soon as a left edge of a building is encountered, we add that building to the dictionary with its height as the key. When we encounte...read more
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Not every process has aptitude but for IT departments and technical team ask for aptitude test

Q1. If fresher then you must know about the company and some banking terminology. If applying for specific role then you must carry knowledge of that subject.
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Q1. They will discuss about norms and salary structure
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Q1. JavaScript basic ques
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Q2. Var vs const vs let
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Coding interview basic level nothing more required for this

Basic coding not more relevant in the whole process

Q1. Okish not that hard
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Q1. Explain event driven architecture of node.js
Ans. 
Node.js uses event-driven architecture where events trigger callbacks to handle asynchronous operations.
• Node.js uses event loop to handle asynchronous operations efficiently

• Events are emitted by various objects in Node.js like HTTP servers, file system, etc.

• Callbacks are registered to handle events and execute code when events occur
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Basic quantitative questions, directional questions, relational questions, etc.

The advantages and disadvantages of social media.

Q1. Basic questions regarding your family background?
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Q2. Entirely based on your resume
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Q1. Tell me about your internship
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Q2. Tell me about your projects
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