Infosys Digital System Engineer Interview Questions, Process, and Tips

No aptitude test in this round.

3 codes were given and we gave to solved them.

Thei round name is Certification round. This round consists of 25 mcqs and 2 coding questions. Test duration is 3 hours. We need to get more than 65 percent to clear this round.

This round name is Advantage Round. This round is optional. But if we clear this round we will interviewed for the DSE role. If clear only 1st round we will be interviewed for System engineer role.

Q1. Implement bubble sort.
Ans. 
Bubble sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order.
• Compare adjacent elements and swap them if they are in the wrong order

• Repeat this process until the list is sorted

• Time complexity is O(n^2)

• Space complexity is O(1)

• Example: [5, 3, 8, 4, 2] -> [3, 5, 4, 2, 8] -> [3, 4, 2, 5, 8] -> [3, 2, 4, 5, 8] -> [2, 3, 4, 5, 8] (so
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Q2. Differences between truncate delete drop
Ans. 
Truncate, delete, and drop are SQL commands used to remove data from a table.
• Truncate removes all data from a table and resets the identity column

• Delete removes specific rows from a table

• Drop removes the entire table from the database

• Truncate and drop cannot be rolled back, while delete can be

• Truncate is faster than delete as it does not log individual row deletions
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Q3. Compare set list tuple.
Ans. 
Set, list, and tuple are data structures in Python with different properties.
• A set is an unordered collection of unique elements.

• A list is an ordered collection of elements that can be modified.

• A tuple is an ordered collection of elements that cannot be modified.

• Sets are useful for operations like union, intersection, and difference.

• Lists are useful for storing and accessing data in a specific order.

• Tuples are useful f...read more
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Q4. Calculate average of an array.
Ans. 
Calculate average of an array.
• Loop through the array and add all the elements

• Divide the sum by the length of the array

• Return the average
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Q5. What is IP address and DNS
Ans. 
IP address is a unique identifier assigned to devices on a network. DNS is a system that translates domain names to IP addresses.
• IP address stands for Internet Protocol address

• It is a numerical label assigned to each device connected to a network

• It serves as a unique identifier for the device

• DNS stands for Domain Name System

• It is a system that translates domain names to IP addresses

• For example, www.google.com is transl
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Q6. How we implement threads in python.
Ans. 
Python provides a built-in module 'threading' to implement threads.
• Import the 'threading' module

• Create a new thread using the 'Thread' class

• Define the target function for the thread

• Start the thread using the 'start()' method

• Join the thread using the 'join()' method

• Use locks to synchronize access to shared resources
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Q7. What are ACID properties.
Ans. 
ACID properties are a set of properties that ensure database transactions are processed reliably.
• ACID stands for Atomicity, Consistency, Isolation, and Durability.

• Atomicity ensures that a transaction is treated as a single, indivisible unit of work.

• Consistency ensures that a transaction brings the database from one valid state to another.

• Isolation ensures that concurrent transactions do not interfere with each other.

• Du...read more
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Round duration - 180 minutes
The first round was Hackwithinfy. This is a coding round and consists of 3 questions- 1 Easy, 1 Medium and 1 Hard. I was able to solve one question completely and passed 14% of the test cases of another question in this round.

Q1. Easy question is based on binary search, the medium question is based on the permutation concept, and the hard question is on Dynamic Programming. And I remember the easy question that was : There are th...read more
Ans. 
Binary search, permutation and dynamic programming based interview question on stone piles.
• The easy question involves splitting stones from one pile to the other two piles.

• The medium question involves permutations of a given set of elements.

• The hard question involves dynamic programming.

• Test cases involve checking if it is possible to obtain two piles with given number of stones after splitting.

• The output should be YES
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Round duration - 30 - 45 minutes
After completing an easy question completely and another medium question 14%, I got shortlisted for the Interview.

Q1. Introduce yourself
Ans. 
I am a digital system engineer with experience in designing and implementing complex systems.
• I have a degree in Electrical Engineering

• I have worked on projects involving FPGA and microcontroller programming

• I am proficient in programming languages such as Verilog, VHDL, and C

• I have experience in designing and testing digital circuits

• I am familiar with various digital communication protocols such as SPI, I2C, and UART
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Q2. Technical Questions included: OOPS concepts, Multi Threading, Exceptional Handling in Java
Ans. 
Technical questions on OOPS, Multi Threading, and Exceptional Handling in Java.
• OOPS concepts include inheritance, polymorphism, and encapsulation.

• Multi Threading allows for concurrent execution of multiple threads.

• Exceptional Handling is used to handle errors and exceptions in code.

• Examples of exceptions include NullPointerException and ArrayIndexOutOfBoundsException.
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Q3. Then he asked me to share my screen and asked to open an online compiler and write the program to sort an array using quick sort. Then he asked me to solve the fibonacci problem using recursion. I answ...read more
Ans. 
Interview question on sorting an array using quick sort and solving fibonacci problem using recursion.
• Demonstrate your coding skills by providing both brute force and optimized solutions.

• Practice coding problems beforehand to be prepared for technical interviews.

• Be comfortable with online compilers and screen sharing.

• Quick sort example: https://www.geeksforgeeks.org/quick-sort/

• Fibonacci recursion example: https://www.g...read more
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Q4. After coding problems he moved to SQL queries, he asked how to find the third highest salary of the employee from the employee table. Then he asked the difference between DELETE and TRUNCATE commands.
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Q1. 3 coding questions were given
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Q1. 2 easy to medium level dsa questions to be written on notepad. one SQL query was asked and basics of HTML,CSS was asked to be written.Few basic hr questions.
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