Hatio Innovations Senior Software Engineer Interview Questions and Answers

Q1. Jave oops concepts, overloading vs overriding, hash map internal implementation, java 8 features, stream api
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Q2. Java related questions, more on project related topics
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Q1. Internal Working Of Hashmap, Java 8 features and two DSA questions one was based on the array and the second one was based on LinkedList. The first interview round was very excellent that's why they conduc...read more
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Q2. Detect loop in a LinkedList,
Ans. 
Detect loop in a LinkedList
• Use two pointers, one moving at twice the speed of the other

• If there is a loop, the faster pointer will eventually catch up to the slower one

• If there is no loop, the faster pointer will reach the end of the list
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Q1. System Design HLD and LLD round which was the final round.
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Q2. HLD and LLD Designing round: Desing Architecture for ChatBot and Company Employee Data Management System.
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Q1. Basic js question closure, async defer and all
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Q2. Create autosuggest debounce, pollyfill
Ans. 
Autosuggest debounce is a feature that delays the search suggestions until the user stops typing, and a polyfill is a piece of code that provides functionality that is not natively supported by the browser.
• Implement a debounce function to delay the autosuggest feature until the user stops typing.

• Use a polyfill to provide support for the autosuggest feature in browsers that do not natively support it.

• Example: Implement ...read more
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Q1. A programming question
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Q2. React-native architecture and flatlist
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Q3. Kadanes algorithm
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Kadane's algorithm is used to find the maximum subarray sum in an array of integers.
• Iterate through the array and keep track of the maximum sum ending at each index.

• At each index, choose between extending the previous subarray or starting a new subarray.

• Example: For array [-2, 1, -3, 4, -1, 2, 1, -5, 4], the maximum subarray sum is 6 (from index 3 to 6).
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Q4. Scalablity, performance
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Q1. Android activity lifecycle
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Q2. Android MVVM architecture
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Interviewer asked two coding question medium level

Q1. I were asked to design parking lot Basically focusing on class diagram and how candidate is thinking about entities and design pattern
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Q1. This is also LLD round interviewer asked me to design book my show How freezing the seats work? In two cases if using sql or not using any database just using cache of application
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2 questions - 1 was on map and other on graph

Q1. Elevator system design
Ans. 
Designing an elevator system involves considering factors like capacity, speed, efficiency, and safety.
• Consider the number of floors in the building and the expected traffic flow to determine the number of elevators needed.

• Choose between different elevator types such as hydraulic, traction, or machine-room-less based on building requirements.

• Implement a control system to optimize elevator movement and reduce wait times...read more
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3Sum, target sum backtracking quesion, leetcode medium question

Q1. Gas station leetcode
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Q2. Dba differnce/explain mysql or nosql databse
Ans. 
MySQL is a relational database management system, while NoSQL databases are non-relational databases.
• MySQL is a traditional relational database that uses tables to store data and SQL for querying.

• NoSQL databases are non-relational and can be document-based, key-value pairs, wide-column stores, or graph databases.

• MySQL is ACID-compliant and suitable for complex queries and transactions.

• NoSQL databases are often used for...read more
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