Atlassian Software Engineer Interview Questions and Answers

Design a traffic signal system

• Identify the number of lanes and intersections

• Determine the traffic flow and peak hours

• Choose appropriate sensors and controllers

• Implement a synchronization algorithm

• Consider emergency vehicle prioritization

• Include pedestrian crossing signals

• Ensure compliance with local regulations

Hashmap is a data structure that stores key-value pairs and provides constant time complexity for insertion, deletion, and retrieval.

• Hashmap uses hashing function to map keys to indices in an array

• Collisions can occur when multiple keys map to the same index, which can be resolved using separate chaining or open addressing

• Java implementation: HashMap<String, Integer> map = new HashMap<>();

This code prints a pyramid pattern of stars based on a specified number of rows.

• Use nested loops: Outer loop for rows, inner loop for spaces and stars.

• Calculate spaces: For each row, print (n - i) spaces before stars.

• Print stars: For each row, print (2 * i + 1) stars after spaces.

• Example for 5 rows: * *** ***** ******* *********

Common point in linked list refers to the node where two or more linked lists intersect.

• The common point can be found by traversing both linked lists and comparing the nodes.

• The common point can also be found by using two pointers, one for each linked list, and moving them until they meet at the common point.

• Examples include finding the intersection point of two linked lists or finding the loop in a linked list.

MVC life cycle, AJAX call and passing data from view to partial view.

• MVC life cycle includes request routing, controller instantiation, action execution, and rendering of the view.

• AJAX call is initiated by sending an HTTP request to the server and receiving a response in the form of JSON or XML data.

• To pass data from one view to a partial view, we can use ViewBag, ViewData, or TempData.

• ViewBag is a dynamic object that ...read more

Abstract class is a class that cannot be instantiated, while interface is a contract that defines methods.

• Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.

• Abstract class can have instance variables, while interface cannot.

• Abstract class is used for code reusability and polymorphism, while interface is used for achieving abstraction and loose coupling.

• In serv...read more