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15 Java Developer Skills You Need to Get Hired in 2023

Posted in Java
Java Developer Skills

At the heart of every great Java application is a great Java developer. With the skills and training to create robust and high-quality applications, Java developers are in high demand.

Whether you're a beginner looking to enter this field or an experienced pro that’s thinking of switching to Java, there are certain Java developer skills that you'll need to succeed.

Are Java Developers in Demand?

The market for Java developers is constantly growing as new technologies emerge and businesses continue to rely on technology to advance their reach.

This is ideal for Java developers with a wide range of skills, such as object-oriented programming, database design, code optimization, and the ability to work independently or as part of a team.

If you want to build a career in Java development, now is an excellent time to learn the necessary skills and techniques.

What Makes a Great Java Developer?

There is no correct version of a great Java developer, as each individual brings their own unique strengths and abilities.

However, some essential qualities to succeed include strong technical skills, excellent communication, teamwork, attention to detail, and a willingness to adapt via continuous learning.

You can also develop your skills by taking classes, attending workshops and conferences, and working on personal projects outside your job’s regular duties.

The benefits of this career are numerous, from the satisfaction of building something worthwhile to the financial rewards that come from being in high demand.

New to Java, but not sure where to start or what to learn? Check out these Java tutorials

Basic Java Developer Skills

1. JDBC and SQL

As a Java developer, you should aim for a solid understanding of Structured Query Language (SQL) and the Java Database Connectivity (JDBC) API. With these skills, you'll be able to interact with databases, execute queries, and retrieve data for use in your applications.

SQL and JDBC skills are some of the hottest among Java developers as they allow you to store, organize, and manipulate data in powerful ways via databases. 

These skills can also be helpful for developing programs that let users access database data or troubleshooting database issues. You can also use these skills to improve application performance and reliability.

2. Use the Latest Java Version

Java versions frequently change, so Java developers need to stay up to date with the latest versions and releases.

Staying current with the latest Java versions shows that you are invested in your craft and take pride in your work. You can also take advantage of the latest features and bug fixes.

However, updating your development environment and building tools with each new release can be time-consuming and expensive. You may also find some dependencies are incompatible with the latest version, which can cause headaches.

In our experience, we’ve found it best to stay current with major Java releases (e.g., Java 8, 9, 10, etc.) and update to the latest minor release after each major release cycle (e.g., 8u162).

This lets you take advantage of new features and bug fixes without compatibility issues. Of course, this is just a general guideline; your mileage may vary depending on your needs.

3. Core Skills (Object-Oriented Programming, Data Structures & Algorithms)

As a Java developer, it's essential to have a strong understanding of core programming concepts like object-oriented programming, data structures, and algorithms.

By mastering these concepts, you'll be able to write robust applications with advanced features, work effectively in agile teams, and stay up-to-date with the latest development trends and best practices.

4. Java Frameworks & Libraries

Java frameworks and libraries are essential for Java developers because they make it easier to build complex applications with various features.

Whether you're working on web applications, mobile apps, or desktop software, there's likely a library or framework that can streamline the development process and improve your code quality.

These common frameworks can help you build robust applications more quickly.

  1. Spring: Build web applications and services. Provides several powerful tools, including dependency injection and model-view-controller (MVC) architecture
  2. Hibernate: Manage data in relational databases
  3. Spring Boot: Builds on Spring and can be used to create microservices, RESTful APIs, and production-ready applications
  4. Struts: Simplifies the process of creating web applications, user interfaces, web services, and managing web content

Intermediate Java Developer Skills

5. JavaFX

JavaFX is a popular platform for creating rich, interactive web applications that work flawlessly across different devices and platforms.

Whether you're developing for mobile devices, desktop computers, or the web, knowing JavaFX is a Java skill that will ensure your applications are engaging, intuitive, and user-friendly.

JavaFX skills are primarily used in a web development or software design role, but learning how to use this platform will likely help you in many areas of Java development.

6. Agile Methodologies

Agile Methodologies

As a Java developer, it's essential to work effectively in an Agile work environment, whether via Scrum, Kanban, or another Agile approach.

Usually, you’ll pick these skills up during your time as a developer, as the specifics can vary based on your company’s preferred Agile methodology.

But generally, working in an Agile team means being skilled at gathering requirements, prioritizing tasks, collaborating with others, writing clean code efficiently, testing your code thoroughly, and working iteratively with stakeholders to ensure the end product meets their needs.

It’s essential to be proficient in some of the most popular Java development tools.

  • Eclipse IDE: Write, debug, and test code
  • Maven: Manage dependencies with large projects
  • Git: Version control software to track your code changes
  • Jenkins: Continuous integration software that automates testing and deployment processes

Applying for Java Developer positions? Get prepared with these 

 Java Interview Questions

Advanced Java Developer Skills

8. Multithreading & Concurrency

Multithreading involves executing multiple threads simultaneously. Concurrency is the ability to run multiple processes simultaneously, sequentially or in parallel, but always with non-zero progress.

Suppose you want to learn Java developer required skills. In that case, these are essential as they allow you to create applications that perform multiple tasks simultaneously, which is key for handling large amounts of data or processing heavy workloads.

9. Design Patterns

Design patterns are reusable solutions for common software development problems.

As a Java developer, familiarity with these design patterns can help you identify issues and select the right solution. Some common design patterns include Singleton, Observer, and Factory methods.

10. Advanced Java

Advanced Java concepts like concurrency, network programming, distributed computing, and data storage are essential for developing highly scalable software that can meet the needs of businesses and organizations. 

With these in-demand Java skills, you’ll also be able to grab the best jobs as you build a successful career as a Java developer.

11. Apache Tomcat & Jetty Web Servers

Experience with popular web servers like Apache Tomcat and Jetty will definitely help you become a successful Java developer.

These tools allow you to quickly and easily deploy Java web applications without having to rely on third-party services or software. They also provide a management interface for your web application.

12. Big Data Concepts & Technologies

As the amount of data that we produce continues to grow exponentially, businesses are increasingly relying on Big Data technologies. 

A solid understanding of Big Data concepts and its popular technologies will allow you to work effectively with large quantities of data and use it to create innovative applications and products.

  • Apache Hadoop: Open-source framework for distributed storage and processing of Big Data
  • Apache Spark: Open-source framework to quickly process Big Data workloads
  • Kafka: Open-source distributed event-streaming framework for real-time Big Data

13. Unit Testing

A popular methodology for unit testing is Test-Driven Development (TDD). This process requires you to write automated tests before any production code, and then you will follow a Red/Green/Refactor cycle.

TDD requires developers to start with a failing test and then just enough code to make the test pass. Developers then incrementally improve, refactor, and add code while checking for test failures and edge cases along the way.

Unit Testing

14. Jakarta EE (Formerly Java Enterprise Edition)

Jakarta EE, formerly Java Enterprise Edition, is a Java-based framework ideal for creating APIs to communicate between applications, making it well-suited to cloud-based microservices, containers, and orchestration.

In its previous form, Java EE was primarily used to create scalable web applications at an enterprise scale, which is still possible for organizations deeply entrenched in the Java EE framework.

  • Jakarta Servlets: Server-side handling of HTTP requests and responses
  • Jakarta Faces: Reusable components to build web application user interfaces
  • Jakarta RESTful Web Services: API to create web services using REST architecture

15. Linux OS & Windows Server Environments

Linux (Unix-based) operating systems and Windows Server environments are the primary platforms on which many applications run.

A solid understanding of various OS aspects will help you manage your projects and ensure your code is compatible across different systems.

  • File systems: Knowledge of file system configuration, data organization and storage, permissions management, and networked file systems
  • Networking: Remote connection & machine via various protocols like SSH, SFTP, FTP, TCP/IP, setting up firewalls, encrypting sensitive data for network transfer
  • Command line & shell scripting: Automate tasks, perform system maintenance, troubleshoot system issues

Java Developer Skills Summary: Basic to Advanced

Java Developer Skill

Overview

JBDC & SQL

Store, organize, and manipulate data into databases that interact with applications

Object-oriented Programming (OOP)

Organize data into reusable classes which are blueprints for ‘objects’ 

Data Structures & Algorithms

Develop appropriate solutions for well-known coding problems and implement suitable data structures

Frameworks & Libraries

Speed up app development with pre-built code that’s optimized for a purpose

JavaFx

Develop rich web apps and desktop applications that can run on multiple platforms

Agile Methodologies

Gather requirements, prioritize tasks, and collaborate with others to write and test clean code

Development Tools

Eclipse IDE for coding, Git for version control, Maven for dependencies, Jenkins for CI

Multithreading & Concurrency

Create applications that perform multiple tasks at the same time

Design Patterns

Identify common coding problems and apply common patterns (Singleton, Observer, Factory)

Apache Tomcat & Jetty Web Servers

Quickly deploy web applications without relying on third-party services or software

Big Data Concepts & Technology

Apache Hadoop, Apache Spark, and Apache Kafka for processing big data (distributed and real-time)

Unit Testing

Write automated tests (fail first) before any code. Apply Red/Green/Refactor cycle

Jakarta EE

Create APIs for cloud-based microservices & containers, or create web applications

Linux OS & Windows Server

Manage file systems, networking, and implement shell scripting

Which Jobs Can I Apply for With Java Skills?

1. Java Developer 

What does a Java developer do? Well, you'll be responsible for writing and testing code that meets the requirements of the project you're working on. You may also be required to liaise with other teams to ensure that the code integrates appropriately with the rest of the system.

Average salary: $80,000 - $125,000

2. Software Engineer 

A software engineer is similar to a Java developer in that they are responsible for writing and testing code. However, software engineers usually have a more well-rounded skill set beyond coding. For instance, they may be involved in the design and architecture of the software system. 

Average salary: $84,000 - $135,000

3. DevOps Engineer 

If you're interested in working with code but want to move away from coding, then a role as a DevOps engineer could be a good fit for you.

DevOps engineers are responsible for ensuring that code runs smoothly and efficiently once deployed. This includes monitoring code performance and identifying potential issues that could arise.

Average salary: $105,000 - $170,000

4. QA Engineer

QA engineers ensure that the code meets all the necessary quality standards before it is deployed, including running tests and writing test plans. QA engineers must have strong attention to detail and excellent problem-solving skills to succeed. 

Average salary: $66,000 - $103,000

5. Technical Writer

Not everyone with java developer skills wants to be a coder. If you prefer to work with words instead, consider becoming a technical writer.

As a technical writer, you'll be responsible for creating documentation that explains how code works and how to use it properly. This job requires excellent communication skills and a deep understanding of technical concepts.

Average salary: $53,000 - $86,000

Top Java Jobs You Can Apply For Today

Did you know that Hackr.io has a job board where you can apply for hundreds of tech positions available all over the world? 

Here’s a sample of some jobs currently available (at the time of writing). Don’t see a position for you? 

Check out the full Hackr.io Job Board

Java Software Engineer, JPMorgan Chase Bank, N.A., Wilmington

JPMorgan Chase & Co. is one of the oldest financial institutions in the U.S. The Java Software Engineer will be a member of the Software Engineering Group, and will be passionate about solving business problems through innovation and engineering practices. You’ll have a BS/BA degree or equivalent experience, and advanced knowledge of application, data, and infrastructure architecture disciplines. An understanding of architecture and design across all systems, a working proficiency in developmental toolsets, and knowledge of industry-wide technology trends and best practices are also required. 

Get the full job information here.

Software Engineer - Java, PayPal, Austin

PayPal believes that every person has the right to participate fully in the global economy. Its mission is to democratize financial services to ensure that everyone, regardless of background or economic standing, has access to affordable, convenient, and secure products and services. The company is looking for a technically strong Software Engineer with hands-on development experience in Java. You’ll be developing efficient, elegant, clean, reusable code, and mentoring other engineers and developers by providing technical and business-related guidance and resources. You will need eight or more years of experience developing large-scale enterprise applications, primarily with Java, as well as eight years of experience developing large-scale applications in Java, Spring Core, and Spring Batch, with good hands-on exposure to SQL and NoSQL technologies. 

Get all the details of this role here.

Java Developer (Senior), Intellibus, Atlanta

At Intellibus, teams build intelligent platforms that process millions of transactions per second. The company is now hiring a Java Developer (Senior) to join its Platform Engineering Team, which is working to solve the multiplicity problem. You’ll work with technologies including Java 8, REST-based Microservices, Hibernate ORM, relational databases, AWS, Kafka and Linux/Unix, and you’ll write applications in Java using object-oriented design principles. Other tasks include building services that are highly available (multi-AZ and multi-region), building algorithms to optimize execution times, and tweaking Terraform scripts to deploy Kubernetes clusters with EKS. 

Think you’ve got what it takes? 

If you have seven years of experience with Java, RESTful API, and Unix, apply for this role here.

Conclusion

As technology evolves and businesses rely more heavily on technology, the Java developer demand is greater than ever, whether in Big Data, game development, Android app development, or DevOps, to name a few.

Java Programming Masterclass updated to Java 17

So, if you're an aspiring developer or an experienced pro in another language looking to switch, specific Java developer skills are essential to your success.

This article has outlined a range of skills required for a Java developer, from basic knowledge of SQL to advanced development with Jakarta EE. Whatever your goals, investing the time to learn these essential skills in 2023 is the best way to land yourself a lucrative role as a Java developer.

New to coding or looking to add Java to your skillset? Check out the Java Masterclass

Looking for your Java dream job? Check out the

Hackr.io Job Board

Frequently Asked Questions

1. What Should a Junior Java Developer Know?

A junior Java developer should have a strong foundation in programming fundamentals, including advanced concepts like classes and objects. They should also be comfortable working effectively in a team, communicating clearly with other devs, and prioritizing tasks to meet deadlines.

2. Does Java Have a Future?

Yes! There is no doubt that Java has a bright future. With popularity among developers, a wide variety of tools and resources, and a robust ecosystem for software development, it continues to be one of the most in-demand programming languages in 2023.

3. Who Is a Good Java Developer?

There is no "right" type of person who makes a good Java developer. Typically, a successful java developer has strong technical skills, the ability to work well in teams, excellent communication and collaboration skills, and an aptitude for learning new concepts quickly. Any additional experience with other programming languages can also be a great advantage.

Kirstie Mcdermott

Kirstie Mcdermott

Kirstie works for our job board partner, Jobbio. Based in Dublin, she has been a writer and editor across print and digital platforms for over 15 years. View all posts by the Author

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