Traveloka Senior Software Engineer Interview Questions and Answers

Hackerrank test : 3 questions
1. Simple Array
2. Recursion followed by DP
3. DFS/BFS Graph Question

Q1. DSA Interview : 1. Search in a rotated array 2. Maximum subarray problem 3. There are n dices with m faces , you have to print count or all the possible ways to get k sum : Recursion followed by DP Questio...read more
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Q1. System Design Round : Design IRCTC , how does IRCTC reserve a seat? What kind of locking do they use?
Ans. 
IRCTC reserves seats using a complex system of availability checks and booking processes.
• IRCTC uses a combination of real-time availability checks and booking processes to reserve seats.

• The system checks for availability of seats in real-time and reserves them for a short period of time while the booking process is completed.

• IRCTC uses a locking mechanism to ensure that the same seat is not booked by multiple users at ...read more
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Q2. Design Makemytrip , how does makemytrip blocks the seat for 15 mins even if the payment doesnot go through?
Ans. 
Makemytrip blocks seat for 15 mins by using a hold on the seat inventory.
• Makemytrip uses a hold on the seat inventory to block the seat for 15 mins.

• If the payment doesn't go through, the hold is released and the seat becomes available again.

• This ensures that the seat is not booked by someone else during the payment process.

• The hold time can vary depending on the airline's policy.

• Makemytrip also sends reminders to compl...read more
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Q1. Hiring Manger Round : Behavioral Questions
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Q2. What are checked and unchecked exceptions?
Ans. 
Checked exceptions are checked at compile-time while unchecked exceptions are not.
• Checked exceptions are those that are checked at compile-time and must be handled by the programmer.

• Unchecked exceptions are those that are not checked at compile-time and can be handled or not handled by the programmer.

• Checked exceptions are subclasses of Exception class while unchecked exceptions are subclasses of RuntimeException class...read more
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Q3. Pros and cons of in-memory database , and distributed database
Ans. 
Comparison of in-memory and distributed databases
• In-memory databases are faster due to data being stored in RAM

• Distributed databases offer better scalability and fault tolerance

• In-memory databases are limited by available RAM

• Distributed databases require more complex setup and maintenance

• In-memory databases are suitable for real-time applications

• Distributed databases are suitable for large-scale applications with high ...read more
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