Core Java

Core Java Developer Job Description Template

If you are building any desktop app (using Swing, AWT, or SWT), any Android mobile app, or any web application using frameworks like Spring, Hibernate, Struts, etc. a very strong command over Core Java is a must. Core Java, as the name suggests, is at the heart of the Java language, rather than involving expertise in the many libraries it has available.


Launched in 1996, Java is still one of the most popular web back-end programming languages. Whether your company is building a small- or large-scale application, writing in Java gives you an edge over others because of its high popularity and the support channels available among its developer community.

If you are building any desktop app (using Swing, AWT, or SWT), any Android mobile app, or any web application using frameworks like Spring, Hibernate, Struts, etc. a very strong command over Core Java is a must. Core Java, as the name suggests, is about the heart of the Java language, and excludes the many libraries available in the mature Java ecosystem.

A developer with a very good understanding of Core Java can learn any Java-centered high-level framework (like Spring) or OS (like Android) with ease. Such developers would be able to switch easily to any object-oriented language (like C++) or a language that’s a mixture of object-oriented and functional approaches (like Scala) in the future.

With Java also keeping up its pace with competitors and continuously introducing many new features in the latest versions, it is still expected to be among the top choices by back-end web programmers. for many more years to come. But its popularity comes at a price: With so many Core Java developers out there, hiring one can sometimes be tricky. Below is a job description template you can customize to help with this task.

Core Java - Job Description and Ad Template

Copy this template, and modify it as your own:

Company Introduction

{{ Write a short and catchy paragraph about your company. Make sure to provide information about the company’s culture, perks, and benefits. Mention office hours, remote working possibilities, and everything else that you think makes your company interesting. }}

Job Description

We are looking for a Core Java developer who will work on writing clean, reusable, modular, and maintainable code that is easy to understand and easy to change. In-depth knowledge of data structures and algorithms is required. This is so that you can apply them better in day-to-day tasks, and so you know which one to choose over the other, especially when using frameworks like the collections framework.

The ideal candidate should be highly motivated and keen to learn new features and changes as Java evolves. {{ Candidates must also be open to other languages and technologies—depending upon project needs. }}


  • Design, develop, and maintain high-quality applications, taking full, end-to-end ownership, including writing test cases, setting up monitoring, etc.
  • Participate in code reviews and provide constructive feedback.
  • Make sure that application code coverage meets our minimum level.
  • Identify bugs and take the initiative to resolve them.
  • {{ Add any other relevant responsibilities here. }}


  • Strong in object-oriented design principles and functional programming.
  • In-depth knowledge of the Java concurrency framework is a must.
  • A very strong command of data structures and algorithms, plus how the Java collections framework uses them.
  • Sound knowledge of concepts like exception handling, garbage collection, and generics.
  • Experience in writing JUnit test cases, using any framework like Mockito, PowerMockito, EasyMock, etc.
  • Hands-on experience with lambdas and streams is a must.
  • Good command over any well-known IDE like IntelliJ, Eclipse, NetBeans, etc.
  • Experience in using build tools like Maven and Ant.
  • {{ Make sure to mention any other frameworks, libraries, or other technologies relevant to your project. }}
  • {{ List any education level or certification you may require. }}
See also:Toptal’s growing, community-driven list of essential Core Java interview questions

Recent Core Java Articles by Toptal Engineers

Find the right Core Java interview questions

Read a list of great community-driven Core Java interview questions.
Read them, comment on them, or even contribute your own.

Read the Questions

Hire a Top Core Java Developer Now

Toptal is a marketplace for top Core Java developers, engineers, programmers, coders, architects, and consultants. Top companies and startups choose Toptal Core Java freelancers for their mission-critical software projects.

See Their Profiles

Martin Redmond

Freelance Core Java Developer
United StatesToptal Member Since January 16, 2023

Martin is a cross-functional executive with expertise in risk management and process improvement, data privacy laws, cyber security products, security program leadership, IT Ops, cloud computing and migration, digital transformation, product, service, innovation management, mobility, big data analytics, DevSecOps, ITILv4, SOC, fraud, APT, forensic, malware, IIoT, CoT and contract and vendor negotiations. Martin has also experience in achieving compliance with multiple risk management frameworks.

Show More

Doug Sparling

Freelance Core Java Developer
CanadaToptal Member Since January 26, 2015

Doug is driven by a need to improve himself, his colleagues, and the products they build. He has experience with many web, back-end, and mobile platforms, most prominently those that are Java-based, such as JVM or Android. Doug's comfortable working at multiple levels at once, from twiddling bits on the wire or providing technical guidance to teams and C-suites alike.

Show More

Daniel Campos

Freelance Core Java Developer
CanadaToptal Member Since February 11, 2015

Daniel is a full-stack software engineer with extensive experience designing and implementing large-scale web-based applications using Java and JavaScript. Lately, he's been working mainly in a microservices architecture leveraging the power of the cloud—particularly the AWS environment. Daniel is a driven individual, a team player, an enthusiastic learner, and, most importantly, a passionate professional.

Show More

Discover More Core Java Developers in the Toptal Network

Start Hiring

Toptal Connects the Top 3% of Freelance Talent All Over The World.

Join the Toptal community.