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5 Skills Needed to Become a Java Developer

A guide to become a Java Developer!


“While Microsoft does not share all of Oracle’s ambitions for Java, we agree that it is a very valuable tool for software developers.” 

– Bill Gates

Although it is quite old and has a long history, Java is not going anywhere anytime soon. According to Statista, as much as 40% of all developers worldwide use Java as their primary programming language. There is a lot of ground to cover when learning Java, as there is when learning any programming language. Java developers are in high demand – it is important for them to stand out from the crowd. A recent survey of developers who use Java as a primary programming language found that in 2021, Java was most commonly used to create websites,  system software, utilities-related apps, and fintech software.

Most used programming languages among developers worldwide

Most used programming languages among developers worldwide as of 2022

The process of finding and hiring Java developers varies depending on the specific needs of each company. Because of the wide range of expertise offered by Java developers, it shouldn’t be difficult to find a good fit for your company’s specific requirements. An entire guide to help you hire Java developers is also available on our blog.

Despite stiff competition from other, more recent languages, Java continues to have high demand. Java is, without a question, a very well-liked programming language. Read on to learn about the most important skills of a Java Developer.

Benefits of Hiring Skilled Java Developers

The following are just a few of the many positive outcomes of businesses employing Java developers.

Access to Specific Skills

Sometimes, the people or resources that possess the expertise your company requires aren’t in the same geographic vicinity. What makes hiring a Java developer remotely through platforms like Gaper appealing is its flexibility in terms of location. Set up an appointment with us if you would like to hire vetted Java developers from our marketplace.

Finding the right Java programmer for the proper role can give a company access to a plethora of resources it needs to achieve business goals and deliver a perfect product to their customer base.


Because Java developers have such a wide range of skills, companies can benefit from increased adaptability in the projects they undertake and other workload they take on.

Automating mundane but essential processes like the hiring process can free up more time for other strategic initiatives. Having flexible models of hiring allows the composition of a tech team to be more dynamic. In case your business is behind on a project, a skilled Java programmer can step in and make up for lost time.

Avoid Application Issues

Hiring an experienced Java developer helps businesses foresee and prevent potential problems with the code and the finished deliverable, allowing them to keep operations running smoothly.

What Should Companies Look for While Looking to Hire Java Developers?  

Hiring a Java expert is not a piece of cake. Some startups and businesses do not have the right resources to help them hire good tech talent. In any case, you must go through a proper vetting process, and keep in mind certain things that you should look for in your candidate to hire a talented and top-notch developer for your company.  

Skill Set Required For A Java Job

Every company has its own preferences depending upon the type of the job, so you need to be well aware of the skills you should look for in your candidate. Refer to the skills listed below and our Java developer hiring guide to help you start hiring.   

Must Fit In Your Company’s Culture  

Another important thing that you should look into with your Java developer is the ability to fit into your company’s culture. Sometimes, remote developers fit in naturally while in–office teams struggle to make basic communication work. Don’t let the mode of work hinder you from putting together a good distributed team.

Should Possess Problem Solving Skills

Every Java developer needs to have the skill of creating, deploying, and managing code efficiently. Moreover, they must give you the solutions that actually work. It is better to consider conducting a live technical test as it will better assist you in determining their capabilities.  

Specialist Java Development Knowledge

When hiring someone for the job, it is essential to know whether they possess the technical expertise needed for a project, but also whether they have a good grasp on basic concepts of Java language that are required for the application’s development.  

Furthermore, it is crucial to administer a test before hiring to know whether they have the required expertise you need in your team or not. 

Technical Skills to Learn Java Development

We decided to look into what firms often seek out when hiring Java developers and the technical skills every Java programmer should acquire or hone to be competitive in the employment market.

Expertise in Artificial Intelligence and Machine Learning Tools.

Nowadays, everything revolves around machine learning, data science, and AI. They have simplified many aspects of our daily lives and professional work. AI and machine learning is largely responsible for most of the noteworthy changes and developments in tech and business in recent times. 

Most of these breakthroughs and smart machines and devices that we use today were made possible by Java’s backend work. Java is the programming language used to create a majority of the most popular tools being used for Big Data.  Therefore, if you are interested in becoming a Java developer, having prior experience in artificial intelligence and machine learning can be beneficial.

  • Design Principles  

Every Java developer should have skills in architecture and software design. Here we are going to list down all the design principles that are essential for every Java developer to have: 

  • OCP (Open/Closed Principle) 
  • DIP (Dependency Inversion Principle) 
  • ISP (Interface Segregation Principle)
  • SRP (Single Responsibility Principle) 
  • LSP (Liskov Substitution Principle)


  • Architectural Patterns  

Some architectural patterns that Java developers are required to learn are listed below:

  • Client-Server Pattern  
  • Pipe-filter pattern 
  • Peer-to-peer pattern  
  • Master-Slave Pattern  
  • Event bus pattern  
  • Blackboard pattern  
  • Model View Controller pattern  
  • Microservices  

Java developers should also know about microservices. The following are some microservices patterns that every Java developer should be aware of.  

  • Time-based security  
  • Handling sensitive information  
  • Docker Rootless Mode  
  • Cloud and Cluster specific security  
  • Delivery pipelines  
  • Access and Identity tokens  
  • GraphQL APIs  
  • Some Other Skills Required For Java Developers 

What are some skills you can acquire or learn as a Java developer that can help you gain an edge over other Java developers?

Designing, security, and testing software are all requisite technical skills for a Java developer. You’ll stand out from the competition if you know advanced server deployment technologies too. Another way to boost your market value is to learn version control and collaborate on projects with others. Other areas of expertise include skills in multiple Object-Oriented Programming languages, Java Design Patterns, and the Java Programming Interface. Senior developers need to thoroughly understand common DevOps tools like Chef, Docker, Maven, Kubernetes, and Jenkins because they are tasked with adopting coding best practices and creating manuals and scripts.

In addition to the skills mentioned above, there are more skills that are always major plus: 

  • JUnit and Mockito  
  • Spring Boot  
  • Design Patterns  
  • JVM Internals  
  • React or Angular  
  • IDE Eclipse or IntelliJ  

Skill Tests Evaluation

There is always the risk of hiring incompetent Java developers when putting together a team. In that case, you’ll lose money because it will take time and resources to train them to be productive team members for your project.

As a result, it is recommended that you evaluate and test the candidate’s knowledge of Java to find the ideal Java developer and avoid possible problems. 

If you cannot test Java applicants on your own, let us help you in hiring however many developers you need for your team. Book an appointment with us today.

Here, we have compiled a list of some skills assessments that can help you dig up a hidden gem for your tech team. Aspiring Java developers can also use these tests to evaluate their own skills and add new skills to their CVs. 

  • Java MCQ Online Test for Hiring the Best Java Developers. Quantifying the skills required for Java architect roles, such as annotation, auto wiring, demand mapping, aggregate functions, and so on, is essential.
  • RESTful Testing. Perform an evaluation of your abilities in areas such as JAX-RS, a framework built on top of REST web services, and RESTEasy, a framework for securing REST web services.
  • Online Core Java Test
  • Java Full Stack Developer Test. Perform skill assessments on a wide range of topics relevant to full-stack Java development, including but not limited to: regular expressions, strings, the Burndown chart, modeling and demand mapping
  • The Java Practical Exam for Selecting Experienced Mid Level Java Developers.
  • Online Advance Java Assessment for Hiring Proficient Senior Programmers.
  • An online evaluation of Spring Boot knowledge and expertise, including annotations, security, dependencies, lines, and configuration, is available to prospective employers.
  • Liferay Online Test Use metrics to evaluate competencies like the number of portlet applications, classes, and portlet deployments in Liferay.

Interview Questions You Should Ask Before Hiring a Java Developer

In this section of the article, we will mention some of the technical questions you can ask a Java development candidate so that you can evaluate their skill set. Let’s have a look.  

  • What is your understanding of the JDK, JVM, and JRE? 
  • Elaborate public static void main? 
  • Describe static class? 
  • What is the objective of the static variables and the static methods? 
  • What do you know about the technique? 
  • Describe the various signatures of methods? 
  • Why do we use the word platform-independent for Java?

How can I Improve My Java Skills?

Java is constantly and periodically updated by the parent firm, so developers must keep their knowledge of Java up to date as well. Getting certified in the most up-to-date features of Java, attending training programmes, and getting up-to-date system training are all frequent ways to upgrade one’s Java knowledge.

How to Learn Java Online For Free With Certificate

Coursera is the best site to learn Java online for free with certificate. Coursera provides access to more than 1,700 Java classes taught by industry experts and faculty from the world’s leading institutions and businesses. These classes can help you launch or enhance your career in Java. You can educate yourself on various subjects, including data science, programming languages, and more. This site offers video tutorials on Java programming in several different languages. The videos can be viewed in various languages, including English, Spanish, Russian, Chinese, and French. These lectures also include contributions from some of the people who were pioneers in establishing some of the computing and programming concepts we are familiar with.

The famous website has now included a free Java education course. It is a top pick among the many excellent interactive Java learning resources available today. Their online IDE (Integrated Development Environment) or Java Editor lets you not only write but also run, test, and debug your code.

As a bonus, it awards certificates following successful completion of training programs. You will learn Java basics, including the OOP (object-oriented programming) paradigm. Along the way, you will be able to use your newly acquired Java knowledge by creating seven different projects.

Many well-known businesses rely on W3Schools. W3Schools has been providing online coding education for more than 20 years. Businesses that are trying to hire competent developers place high importance on their certifications. Over 50,000 certifications have been issued so far. W3Schools covers an extensive syllabus of Java concepts and tutorials. It begins at the ground level so that anyone taking the refresher course can quickly and easily grasp the language.

Learn Java Online Free For Beginners

If you are just starting out with Java development, you can easily find lectures online to learn Java online for free for beginners. Users should not worry about cost, as most of these sites provide free guides.

One of the fastest ways to learn Java and increase a programmer’s coding competence while learning is to tackle various coding challenges. This is one of the finest ways to learn Java. Programmers can improve their problem-solving skills by taking on and completing various challenges. The developer will benefit from gaining a deeper understanding of it as well. In addition, IT professionals can practice coding on websites to prepare for interviews.

List Of Websites To Learn Java For Free

To help you out, we have compiled a list of the top 5 websites to learn Java for free.

1. Pluralsight

Pluralsight has many helpful online courses for learning Java and other programming languages. Pick the courses you’re interested in and move through them at your own pace.

The website also offers a free trial that, if used wisely, would give you more than enough time to gain a solid foundation in Java and Coding.

2. Udemy

The second site on our list of the best five websites is Udemy. This is one of the best online resources for learning programming languages like Java. If you’re a beginner in need of a solid foundation in Java, Udemy’s Java Programming for Complete Beginners Course is the best option. There are paid and free options available. In addition, several courses are available to learn Java from scratch for a low price (about $10), including The Complete Java Masterclass, widely regarded as one of the best courses for beginner programmers interested in learning Java. This course has been brought up-to-date to include coverage of two LTS releases of Java, versions 11 and 17.

3. Stack Overflow

Stack Overflow is one of the most well-known and often visited sites in the programming community. There are millions of helpful answers to questions on the site, and they pertain to every programming language possible. For this reason, StackOverflow includes numerous code segments where developers may get code examples on a wide range of topics, which is essential for learning any programming language.

Stack Overflow’s community-oriented nature is a major selling point. When engaged, its various communities provide programmers with access to the site’s extensive database of questions and answers. Programmers can discover various tips and tricks, many of which are exclusive to this website and cannot be found anywhere else.

4. Learn Java Online 

This tutorial on learnjavaonline.org is an online, interactive resource that provides access to a free Java course. It’s a gateway to the Java ecosystem. Whether you’re just starting out or are an experienced coder, this website has everything you need to master the Java programming language.


  • How can I hire Java developers?


Gaper uses a perfect match mechanism to find the most compatible and talented Java developers and a Java architect ideal for organizations needing reliable developers. Gaper has developed a systematic and deliberate procedure for finding and vetting suitable placements for expert Java developers in various organizations and startups. Book an appointment with us to learn more about hiring Java developers.  

  • What are the skills required for Junior Java developer?


Here are some skills required for a Junior Java Developer:


  • Java-based web services,
  • JavaScript,
  • HTML,
  • CSS,
  • SQL,
  • ORM,
  • J2EE framework,
  • Object Oriented Analysis and Design.


Let’s Wrap Up

A competent Java developer has solid coding skills and in-depth familiarity with the Java ecosystem. It is important to keep up with the latest versions of several of the technologies that Java uses. To be successful in Java development, one must keep up with the language’s constant evolution.

To become a “full-stack” developer, all developers must adopt the same set of technologies if they are to work towards a cohesive system of software development and project management. Soft skills are also a must for any Java developer, and the following are some that are particularly important:

  • Having good interpersonal and communication abilities
  • Presentation skills
  • Teamwork and collaboration
  • Ethics in the workplace

It takes a wide range of technical skills to be an effective Java developer. Developing these skills requires consistent practice and also experience. We have covered some of the most important abilities you’ll need to succeed as a Java developer. Always remember that practice is the key to writing well-designed, fast, and testable code. 

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