Software Engineering Lead Interview Questions and Answers

To check if two strings are anagrams, connect two databases in Spring, and reload configuration without downtime in Spring.

• To check if two strings are anagrams, use Java Collection Framework to compare the characters in both strings.

• To connect two databases in Spring, configure multiple data sources in the application context file.

• To reload configuration in Spring without downtime, use Spring Cloud Config to externalize configuration and refresh it at runtime.

Time and space complexity are measures of performance of a code.

• Time complexity measures how long a code takes to run as input size increases.

• Space complexity measures how much memory a code uses as input size increases.

• Both are usually expressed in Big O notation.

• Optimizing for one may lead to worse performance in the other.

List comprehension is a concise way to create lists in programming languages like Python.

• List comprehension is a compact way to generate lists by applying an expression to each item in a sequence.

• It is commonly used in Python and allows for more readable and efficient code.

• Example: squares = [x**2 for x in range(10)] will create a list of squares of numbers from 0 to 9.

PHP is a server-side scripting language used for web development.

• PHP stands for Hypertext Preprocessor.

• It is commonly used to create dynamic web pages.

• PHP can interact with databases like MySQL to create dynamic content.

• It is open source and widely supported by web servers.

• Popular content management systems like WordPress and Drupal are built using PHP.

Collections are data structures used to store and manipulate groups of related objects.

• Collections provide a way to organize and manage data efficiently.

• Common types of collections include lists, sets, and maps.

• Collections can be used to perform operations such as sorting, filtering, and searching.

• Examples of collections in Java include ArrayList, HashSet, and HashMap.

Design Twitter timeline to display tweets in chronological order

• Use a database to store tweets with timestamps

• Implement a sorting algorithm to display tweets in chronological order

• Include features like retweets, likes, and replies

• Allow users to filter timeline based on hashtags or users they follow