7 Hard Skills That Every Java Developer Must Possess

  1. Object-Oriented Programming

Object-Oriented Programming (OOP) includes:

Abstraction
Encapsulation
Polymorphism
Inheritance
Predefined types
User-defined types
Operations

2. Design Principles

The following are the main design elements that are crucial for Java developers:

SOLID Principles

Single Responsibility Principle (SRP)
Open/Closed Principle (OCP)
Liskov Substitution Principle (LSP)
Interface Segregation Principle (ISP)
Dependency Inversion Principle (DIP)
DRY (Don’t Repeat Yourself)
KISS (Keep it simple, Stupid!)
YAGNI (You ain’t gonna need it)

3. Architectural Patterns

Layered pattern
Client-server pattern
Master-slave pattern
Pipe-filter pattern
Broker pattern
Peer-to-peer pattern
Event-bus pattern
Model-view-controller pattern
Blackboard pattern
Interpreter pattern

4. Microservices

Java programmers must catch up with the movement toward creating microservices rather than large, centralized programs.

The Docker Container must be understood by developers. In various scenarios, microservices applications are developed and compiled using Docker. The DURS principles, which form the cornerstone of Microservices, must be known by developers.

DURS principles are:

Domain-Driven Design
Failure Isolation
Continuous Delivery
Decentralization
DevOps

The areas of microservices architecture are crucial for developers to understand. The focal points are:

Authentication
Authorization
Data Security
Network Security
Deployment

5. DevOps Tools

Jenkins
Ansible
Nagios
Docker
Git
Gradle
Raygun
Puppet
Phantom

6. CI/CD — Features

Developers should become familiar with the following CI/CD tool functionalities.

build automation
integration testing
source control management
version management
deployment automation
reporting

7. Spring Boot

To create REST services, every Java developer has to be familiar with Spring Boot. Internally, the Spring framework employs the dependency injection principle. It also uses the Model View Controller Pattern as a foundation.

The Spring framework is the foundation of Spring Boot. It is utilized for web application development employing agile and fast prototyping techniques. Among the characteristics of Spring Boot are:

Project Support
Starter Project Wizard
Spring Initializr,
CLI
Annotations
Dependency Mgmt
Starters
Actuator
JPA
JDBC
Transaction Mgmt
ORM

Thanks for reading!

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Bora Erbaşoğlu

Bora Erbaşoğlu

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Technical Software Development Manager | Personal Software Coach