Equifax Software Developer Interview Questions and Answers

I am familiar with a wide range of technologies used in software development.

• Java

• Python

• C++

• JavaScript

• HTML/CSS

• SQL

• Git

• Linux

• RESTful APIs

• Agile methodologies

OOPs concepts in Java include encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: Bundling data and methods together in a class.

• Inheritance: Creating new classes from existing ones, inheriting their properties and behaviors.

• Polymorphism: Objects of different classes can be treated as objects of a common superclass.

• Abstraction: Hiding complex implementation details and providing a simplified interfa

Abstraction can be achieved through interfaces, abstract classes, and encapsulation.

• Using interfaces to define a set of methods that a class must implement

• Using abstract classes to provide a base implementation that can be extended by subclasses

• Encapsulating implementation details to hide complexity and provide a simpler interface

• Using design patterns such as Factory and Strategy to abstract away implementation details

Class is a blueprint for creating objects while interface defines a contract for implementing classes.

• Class is a template for creating objects with properties and methods.

• Interface is a contract that defines a set of methods and properties that a class must implement.

• Object is an instance of a class that has its own set of properties and methods.

• Function instance is a reference to a function that can be called with arg...read more

Access modifiers control the visibility and accessibility of class members.

• Access modifiers include public, private, protected, and internal.

• Public members can be accessed from anywhere.

• Private members can only be accessed within the same class.

• Protected members can be accessed within the same class and its subclasses.

• Internal members can be accessed within the same assembly.

• Access modifiers help enforce encapsulation ...read more

Cloud refers to the delivery of computing services over the internet.

• Cloud computing allows users to access data and applications from anywhere with an internet connection.

• Cloud services can be categorized into three main types: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS).

• Cloud providers include Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform.

• ...read more

There are multiple ways to achieve tasks on AWS depending on the specific task.

• Using AWS Management Console

• Using AWS CLI

• Using AWS SDKs

• Using AWS CloudFormation

• Using AWS Elastic Beanstalk

• Using AWS Lambda

• Using AWS Step Functions

• Using AWS Batch

Inner join returns only matching rows from both tables while outer join returns all rows from one table and matching rows from the other.

• Inner join is used to combine data from two tables based on a common column.

• Outer join is used to combine data from two tables where one table may not have matching rows in the other.

• There are three types of outer join: left outer join, right outer join, and full outer join.

• Left outer...read more

An abstract class is a class that cannot be instantiated and is used as a base class for other classes.

• An abstract class can have abstract and non-abstract methods.

• Abstract methods have no implementation and must be implemented by the derived class.

• An abstract class can have constructors and fields.

• An abstract class can be used to define a common interface for a group of related classes.

• Example: Animal is an abstract c...read more

Normalization is a process of organizing data in a database to reduce redundancy and dependency.

• Normalization is used to eliminate data redundancy and dependency.

• 3NF (Third Normal Form) eliminates transitive dependencies while BCNF (Boyce-Codd Normal Form) eliminates partial dependencies.

• 3NF is a subset of BCNF.

• Normalization helps in improving data consistency and integrity.

• Normalization can also improve database perfo

I am a software developer with experience in various programming languages and a passion for creating innovative solutions.

• Proficient in Java, C++, and Python

• Experience with web development using HTML, CSS, and JavaScript

• Familiarity with agile development methodologies

• Strong problem-solving and analytical skills

• Excellent communication and teamwork abilities

Array is a collection of elements of same data type. Linked list is a data structure where each element points to the next one.

• Arrays have fixed size, linked lists can grow dynamically

• Accessing elements in an array is faster than in a linked list

• Inserting or deleting elements in a linked list is faster than in an array

• Arrays are stored in contiguous memory locations, linked lists are not

• Arrays are used for random acces

The OSI model is a conceptual model that describes the communication functions of a telecommunication or computing system.

• The OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and communicates with the layers above and below it.

• The Physical layer deals with the physical transmission of data, while the Application layer deals with u...read more

The OSI model is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system.

• The OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and communicates with the layers above and below it.

• The Physical layer deals with the physical transmission of data, while the Applicati...read more