Incedo Software Engineer Interview Questions and Answers

Designing a REST API for concurrent read and write access involves strategies for data consistency and performance.

• Use HTTP methods appropriately: GET for reads, POST/PUT for writes.

• Implement optimistic concurrency control to handle conflicts.

• Utilize versioning in resources to manage updates.

• Consider using WebSockets for real-time updates alongside REST.

• Leverage caching mechanisms to reduce read load on the databa...read more

Best practices for managing secrets in code include using secure storage, environment variables, and access controls.

• Use environment variables to store sensitive information instead of hardcoding them in the source code.

• Utilize secret management tools like HashiCorp Vault, AWS Secrets Manager, or Azure Key Vault for secure storage.

• Implement access controls to limit who can view or modify secrets, ensuring only aut...read more

Identify the second largest number in an array by iterating through the elements and tracking the largest and second largest values.

• Initialize two variables: 'largest' and 'secondLargest' to negative infinity.

• Iterate through each number in the array.

• Update 'largest' if the current number is greater than 'largest'.

• If the current number is less than 'largest' but greater than 'secondLargest', update 'secondLargest'.

• ...read more

Reversing an array involves changing the order of its elements to the opposite sequence.

• Use a loop to swap elements from the start and end towards the center. Example: [1, 2, 3] becomes [3, 2, 1].

• In Python, you can use slicing: arr[::-1] to reverse an array. Example: ['a', 'b', 'c'] becomes ['c', 'b', 'a'].

• In Java, use Collections.reverse() for lists. Example: Arrays.asList('x', 'y', 'z') becomes ['z', 'y', 'x'].

• C...read more

Hashmap is not thread-safe while Concurrent Hashmap is thread-safe.

• Hashmap is not suitable for multi-threaded environments as it can lead to race conditions and data inconsistencies.

• Concurrent Hashmap allows multiple threads to access and modify the map concurrently without any data inconsistencies.

• Concurrent Hashmap uses a technique called lock striping to achieve thread-safety.

• Concurrent Hashmap is slower than H...read more

To find the middle element of a linked list

• Traverse the linked list using two pointers - one moving one node at a time and the other moving two nodes at a time

• When the faster pointer reaches the end of the list, the slower pointer will be at the middle element

• If the list has even number of elements, there are two middle elements