Perfios Software Solutions SDE Interview Questions, Process, and Tips

4 DSA questions and aptitude questions. It was a pen and paper test for nearly 75 to 90 min

Q1. DBMS fundamental questions
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Q2. Variation of repeating DNA sequences LC question.
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Q3. DB Schema and API design of my internship work.
Ans. 
Designed DB schema and API for internship project
• Created normalized database schema to store user information, orders, and products

• Implemented RESTful API endpoints for CRUD operations on user data

• Used authentication and authorization mechanisms to secure API endpoints

• Optimized queries for efficient data retrieval and processing
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Q1. Fundamental OS questions
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Q2. Basic stack questions
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Q1. Strings question. Had to do this in O(1) TC and O(1) SC
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Q2. Extensive discussion on internship experiences
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Q1. How do alarm clock work in phones
Ans. 
Alarm clocks in phones work by triggering a pre-set notification at a specific time to alert the user.
• Alarm clock app is programmed to trigger a notification at a specific time set by the user

• The phone's system clock is used to track the current time and compare it to the set alarm time

• When the alarm time matches the current time, the phone plays the selected alarm sound or vibration

• Users can customize alarm settings s...read more
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Q2. Real life application of DSA
Ans. 
Data Structures and Algorithms are used in real life applications such as social media algorithms, GPS navigation, and search engines.
• Social media algorithms use DSA to personalize user feeds based on their interests and interactions.

• GPS navigation systems use Dijkstra's algorithm to find the shortest route between two locations.

• Search engines like Google use algorithms like PageRank to rank web pages based on relevanc
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