Java Developer Core Java Desktop Software

Salary: £30,000 - 35,000 per year

Requirements

• We need strong practical Core Java and object-oriented programming skills.
• We value the ability to discuss Java projects you have personally built or significantly contributed to.
• We look for strong analytical and problem-solving ability.
• We need the ability to write clear, practical, maintainable code.
• We require willingness to work on existing commercial codebases.
• We prefer interest in desktop software, user interfaces and practical product development.
• We expect good communication skills.
• We need reliability, maturity and the ability to work consistently from our Stafford office.
• We value initiative and a willingness to keep learning.
• You must be eligible to work in the UK and able to work without visa sponsorship.
• A degree in Computer Science or equivalent practical experience would be beneficial.
• Strong personal projects, GitHub work, portfolio examples or demonstrable practical coding ability are highly valued.
• We are open to strong early-career applicants who can demonstrate practical Java ability and confidence to contribute quickly.

Responsibilities

• We will develop Java desktop software using Core Java.
• We will work with larger commercial codebases.
• We will learn and work with Java Swing-based applications.
• We will debug, test and improve application performance.
• We will improve desktop user interfaces, usability and workflows.
• We will improve speed, reliability and maintainability.
• We will handle database integration and data handling.
• We will learn how long-term commercial software products are built, maintained and improved.
• We will contribute ideas and improvements across the development team.

Technologies

• GitHub
• Java
• Swing
• AI
• Backend
• Exposed
• Frontend
• Support
• JavaFX
• JavaScript
• Marketing
• Web

More

We are Semantics 21, a multi-award-winning UK software company developing specialist software used internationally within public safety and investigative environments. Our technology helps organisations process and review digital evidence more effectively, supporting important real-world outcomes in areas including child protection and public safety. This is a full-time, permanent, office-based role in our Stafford office, and we are not recruiting for remote work. We offer a friendly, supportive working environment with free onsite parking, flexible start and finish times by agreement, mentoring from experienced developers, opportunities for progression, direct access to leadership, and long-term product-focused development work. The salary is £30,000 to £35,000 depending on experience and practical ability.

last updated 27 week of 2026