Java Certification Jobs in Manassas, VA (NOW HIRING)

Job#: 3038663
Job Description:
Java Developer/Tester
Location: Manassas, Virginia (Onsite)
Candidates must be able to obtain and/or maintain a Department of Defense --Secret clearance as a condition and continuation of employment.
Role Overview
We are seeking a Java Developer with experience in mid-to-front-end stack development. This role involves developing, integrating, and troubleshooting software systems within a Linux/Unix environment. The position requires hands-on experience in writing unit and component tests, working with multithreaded applications, and refactoring complex software.
Key Responsibilities

• Develop and maintain Java-based applications, with a focus on multithreading.
• Write effective unit and component tests for new and existing code.
• Integrate, test, troubleshoot, and refactor software systems to improve performance and stability.
• Operate within a Linux/Unix development environment.
• Contribute to the full software development lifecycle in an Agile setting.
• Utilize bash scripting for various development and operational tasks.

Required Qualifications
Education: A B.S. in Computer Science, Software/Computer/Electrical Engineering, or a related STEM discipline is required.
Experience: Candidates must have proven Java development experience, including multithreading. A strong background in Linux/Unix development, integration, and troubleshooting is necessary. This includes hands-on experience writing unit and component tests for code not originally authored by the candidate, and a combined total of 3+ years in Linux, scripting/software development, and configuration management.
Preferred Qualifications

• Advanced Java multithreading skills.
• Experience with databases such as MongoDB or PostgreSQL.
• Familiarity with inter-process messaging middleware like gRPC or Artemis.
• Knowledge of UI frameworks, including JavaFX or Swing.
• Understanding of reactive programming (RxJava, Kotlin Coroutines, Flow).
• Experience with performance-tuning tools (JVisualVM, JConsole, JProfiler).
• Knowledge of containerization and orchestration technologies like Docker or Kubernetes.

Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico.
Everforth Apex uses a virtual recruiter as part of the application process. Click for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at
Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Everforth Apex team member can provide.
Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.
If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at or . Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered.
UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems.