Open Financial Technologies Private Limited Devops Engineer Interview Questions and Answers

Q1. Production level Kubernetes
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Q1. Linux commandsused in project
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Q2. Troubleshooting pods creation
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Q1. DHCP and DNS difference
Ans. 
DHCP assigns IP addresses to devices on a network, while DNS resolves domain names to IP addresses.
• DHCP dynamically assigns IP addresses to devices on a network

• DNS resolves domain names to IP addresses

• DHCP is used for automatic IP address configuration

• DNS is used for translating domain names to IP addresses

• DHCP operates at the network layer (Layer 3)

• DNS operates at the application layer (Layer 7)
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Q2. Networking protocols and respective port numbers.
Ans. 
Networking protocols and their respective port numbers are essential for communication between devices.
• HTTP - Port 80

• HTTPS - Port 443

• FTP - Port 21

• SMTP - Port 25

• SSH - Port 22

• DNS - Port 53
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Q1. Current and expected Salary
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Q2. Reason for leaving the current company.
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Q1. Basic technical question
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Q2. Basic Server and basic security related question.
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Was a tough oneto crack

Q1. Asked about core Java domain and threds
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Q2. Asked about Java domain and threads collection
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Q3. Threads and collection
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Q1. Minimum number of platforms required for train station
Ans. 
Minimum of two platforms are required for a train station.
• At least two platforms are needed for trains to arrive and depart simultaneously.

• Additional platforms may be required depending on the frequency of trains and passenger traffic.

• Platforms should be long enough to accommodate the longest trains that will use the station.
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Q2. Longest Palindromic substring
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The problem is to find the longest substring that is a palindrome in a given string.
• A palindrome is a string that reads the same backward as forward.

• We can use dynamic programming to solve this problem.

• We can start by considering each character as the center of a palindrome and expand outwards to find the longest palindrome.

• We can also optimize the solution by using Manacher's algorithm which reduces the time complexit
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Q1. Sort the elements of an unsorted array
Ans. 
Use any sorting algorithm to sort the elements of an unsorted array.
• Choose an appropriate sorting algorithm based on the size of the array and the type of elements.

• Common sorting algorithms include bubble sort, insertion sort, selection sort, merge sort, quick sort, and heap sort.

• Implement the chosen algorithm in the programming language of your choice.

• Test the sorting function with various input arrays to ensure corre
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Q2. Minimum energy required to cross all the hurdles without loosing life. If any point energy becomes 0 game over. Input: [-2,-3,3,1,5]
Ans. 
Find minimum energy required to cross all hurdles without losing life.
• Calculate cumulative sum of energy required to cross each hurdle.

• Find the minimum cumulative sum and add 1 to it.

• If the minimum cumulative sum is negative, return its absolute value + 1.

• This is the minimum energy required to cross all hurdles without losing life.
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Coding test was conducted in hacker earth

Q1. In technical interview they asked the current company work and asked the Instagram db design and usecases and api response of the comment section
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Q2. They asked about the coding test question in round 1
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