Confluent Interview Questions and Answers

4 Coding questions, I solved 3 and shortlisted for interview

Q1. 1 coding question was asked and next round thread based coding question was asked
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Q1. Basic HR questions were asked to test and know about me
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1 hour duration. Sliding window problem. On hacker rank platform. Expected to write a working code and solve it optimally/scalable solution.

Q1. Again a coding test. LLD + hash map. 1 hour on hacker rank.
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Q1. Search for a variant pattern like in a list of documents.
Ans. 
Implement a search algorithm to find variant patterns in a list of documents efficiently.
• Use regular expressions to identify patterns, e.g., searching for 'cat' in 'caterpillar' or 'catalog'.

• Consider using a trie data structure for efficient prefix searching.

• Implement fuzzy matching to account for typos or variations, e.g., 'color' vs. 'colour'.

• Leverage natural language processing (NLP) techniques for semantic search.

• O...read more
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Q2. Enhance serch variant
Ans. 
Enhancing search variants involves improving search algorithms for better accuracy and relevance in results.
• Implement advanced algorithms like TF-IDF or BM25 for better ranking of search results.

• Utilize machine learning models to understand user intent and improve result relevance.

• Incorporate synonyms and related terms to broaden search queries, e.g., searching 'car' also shows results for 'automobile'.

• Use natural lang...read more
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Q3. What is the time complexity
Ans. 
Time complexity measures the amount of time an algorithm takes to complete as a function of the input size.
• Big O notation is commonly used to express time complexity (e.g., O(n), O(log n)).

• Linear search has a time complexity of O(n) because it checks each element in the array.

• Binary search has a time complexity of O(log n) as it divides the search space in half each time.

• Nested loops typically result in O(n^2) complexi...read more
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Q4. What is the sapce complexity
Ans. 
Space complexity measures the amount of memory an algorithm uses relative to the input size.
• Space complexity is expressed as a function of the input size, e.g., O(n) or O(1).

• It includes both the auxiliary space and the space used by the input.

• Example: A function that creates an array of size n has O(n) space complexity.

• In-place algorithms, like bubble sort, have O(1) space complexity since they require no additional st
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Q5. Make it thread safe
Ans. 
Ensure thread safety by using synchronization mechanisms to prevent concurrent access issues.
• Use synchronized blocks or methods to control access to shared resources.

• Example: synchronized void increment() { count++; }

• Utilize locks (e.g., ReentrantLock) for more granular control over synchronization.

• Example: ReentrantLock lock = new ReentrantLock(); lock.lock(); try { count++; } finally { lock.unlock(); }

• Consider using ...read more
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It was a 1 hour Technical screening round, coding question in java (you cna choose your own language). They asked a difficult version of regex matching question (Leetcode medium-hard).