Cisco Data Engineer Interview Questions, Process, and Tips

Q1. Asked about projects
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Q1. How would you build a pipeline for a Machine learning project?
Ans. 
To build a pipeline for a Machine learning project, you need to collect data, preprocess it, train the model, evaluate its performance, and deploy it.
• Collect relevant data from various sources

• Preprocess the data by cleaning, transforming, and normalizing it

• Split the data into training and testing sets

• Train the machine learning model using the training data

• Evaluate the model's performance using the testing data

• Fine-tune...read more
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Q2. How do you measure the performance of a model?
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Performance of a model can be measured using various metrics such as accuracy, precision, recall, F1 score, ROC curve, and confusion matrix.
• Use accuracy to measure the overall correctness of the model's predictions.

• Precision measures the proportion of true positive predictions out of all positive predictions.

• Recall measures the proportion of true positive predictions out of all actual positives.

• F1 score is the harmonic...read more
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Round duration - 90 minutes
Round difficulty - Medium

It had 14 MCQ questions and one coding question.

Q1. Optimal Strategy for a Game
You and your friend Ninjax are playing a game of coins. Ninjax place the 'N' number of coins in a straight line.
The rule of the game is as follows:
1. Each coin has ...read more
Ans. 
The task is to find the maximum amount you can definitely win in a game of coins against an opponent who plays optimally.
• The game is played with alternating turns, and each player can pick the first or last coin from the line.

• The value associated with the picked coin adds up to the total amount the player wins.

• To maximize your winnings, you need to consider all possible combinations of coin picks.

• Use dynamic programmin...read more
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Round duration - 60 Minutes
Round difficulty - Medium

It started with introduction , discussion of some projects I did (in depth)
After as i have Machine Learning in my resume , asked some questions regrading data quality , how to improve it . What is considered as bad data
Then 2 DSA questions 
3-4 SQL queries : nth largest salary , JOINS, etc

Q1. Search In Rotated Sorted Array
Aahad and Harshit always have fun by solving problems. Harshit took a sorted array and rotated it clockwise by an unknown amount. For example, he took a sorted array = [1, 2,...read more
Ans. 
This is a problem where we need to search for a given number in a rotated sorted array.
• The array is sorted and then rotated, so we can use binary search to find the number.

• We can find the pivot point where the rotation happened and then perform binary search on the appropriate half of the array.

• To find the pivot point, we can use a modified binary search algorithm.

• Once we find the pivot point, we can determine which ha...read more
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Q2. Next Greater Number
You are given a string S which represents a number. You have to find the smallest number strictly greater than the given number which contains the same set of digits as of the original ...read more
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The task is to find the smallest number greater than the given number, with the same set of digits.
• Iterate through the digits of the given number from right to left.

• Find the first digit that is smaller than the digit to its right.

• Swap this digit with the smallest digit to its right that is greater than it.

• Sort the digits to the right of the swapped digit in ascending order.

• If no such digit is found, return -1.
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Round duration - 60 Minutes
Round difficulty - Easy

It was the managerial round

Started from projects , tech stack used , SQL query , Joins, Normalization 
and simple discussion of space and time after coding binary search both iterative and recursive

Q1. Covid Vaccination
We are suffering from the Second wave of Covid-19. The Government is trying to increase its vaccination drives. Ninja wants to help the Government to plan an effective method to help incr...read more
Ans. 
This question asks for finding the maximum number of vaccines administered on a specific day during a vaccination drive, given the total number of days, total number of vaccines available, and the day number.
• Read the number of test cases

• For each test case, read the number of days, day number, and total number of vaccines available

• Implement a logic to find the maximum number of vaccines administered on the given day num...read more
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