Worldline SDE Interview Questions and Answers

Asked me to rewrite SQL in 20 minutes insanely tough and rude interviewer

Given 3 DSA medium level problems

One hour face to face round. Given system design problem of parking lot.

Q1. Description about project from resume
Ans. 
Developed a web application for online shopping
• Used HTML, CSS, and JavaScript for front-end development

• Implemented backend using Node.js and MongoDB

• Integrated payment gateway for secure transactions
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Q2. Lot of behavourial questions.
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Q1. Palindrome check standard leetcode question pretty easy
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Q2. Why Visa inc etc etc standard hr question
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3 Coding Questions of moderate level .

Q1. DBMS Project asked in deep.
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Q2. Basic codes to write e.g. Insertion , Deletion in Linkedlist
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Q3. As i haved added ML project. They go into algorithms detailed explanation.
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Q1. Ask Questions abt family background.
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Q2. Few more details about your future plan.
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Very easy online coding round

Q1. E mail classifier using ML
Ans. 
Email classifier using ML
• Use supervised learning algorithms like Naive Bayes or Support Vector Machines

• Preprocess email data by tokenizing, removing stop words, and stemming

• Split data into training and testing sets for model evaluation

• Evaluate model performance using metrics like accuracy, precision, recall, and F1 score
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Q2. What do you think about chatgot
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It consist of 3 questions on hackerrank

Q1. Dont remember the exact it was related to array manipulation
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Q2. Dont remember the exact but it was string manipulation
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Easy questions tbh and the interviewer was chill

Q1. Binary search to find the number of coins
Ans. 
Binary search can be used to efficiently find the number of coins in a sorted array.
• Start by setting low to 0 and high to the length of the array minus 1.

• While low is less than or equal to high, calculate the mid point.

• Compare the value at the mid point with the target number of coins and adjust low or high accordingly.

• Return the index of the target number of coins if found, otherwise return -1.
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Q2. Oops questions that too basic questions
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