Software Engineer - Secure Systems

Job#: 3054178 Job Description: Candidates must be U.S. citizens able to obtain and/or maintain a Department of Defense security clearance as a condition and continuation of employment. Software Developer (Top Secret Clearance Required) Location: King of Prussia, PA (100% Onsite) Clearance: Active Top Secret Clearance Required Employment Type: Full-Time Position Overview We are seeking talented Software Developers to join a mission-focused engineering team supporting critical national security initiatives. This opportunity is ideal for engineers with experience in modern software development, cloud technologies, DevOps practices, and Agile environments. Candidates may come from a variety of development backgrounds, including Java, C#, Python, or JavaScript/TypeScript, and will contribute to the design, development, testing, and deployment of secure, scalable software solutions supporting highly sensitive government programs. This role requires an active Top Secret security clearance and onsite work in King of Prussia, Pennsylvania. Responsibilities Design, develop, test, and maintain secure software applications and services.Develop solutions using Java, C#, Python, JavaScript/TypeScript, or related technologies.Build and support microservices, APIs, backend services, and distributed systems.Collaborate with cross-functional engineering teams in Agile/Scrum environments.Participate in sprint planning, daily standups, backlog grooming, and retrospectives.Contribute to CI/CD pipelines, infrastructure automation, and deployment strategies.Develop and maintain cloud-native applications and services.Perform code reviews and promote software engineering best practices.Troubleshoot and resolve software defects and performance issues.Mentor junior engineers and provide technical guidance to team members.Support mission-critical initiatives while complying with security and quality standards. Required Qualifications Active Top Secret Security Clearance required at the time of hire.Ability to obtain and maintain additional government clearances, including SCI and/or Special Access Program (SAP) eligibility.Professional software development experience using one or more of the following:JavaC#PythonJavaScript/TypeScriptExperience developing modern applications using software engineering best practices.Experience with cloud platforms such as:AWSMicrosoft AzureGoogle Cloud Platform (GCP)Experience building and supporting:MicroservicesRESTful APIsDistributed systemsData-centric applicationsExperience with DevOps and CI/CD tools such as:JenkinsGitLab CI/CDAzure DevOpsExperience with containerization technologies including:DockerKubernetesExperience using Git and version control best practices.Strong understanding of Agile and Scrum methodologies.Experience using Jira, Confluence, or similar Agile collaboration tools.Strong problem-solving, communication, and collaboration skills. Preferred Qualifications Experience supporting Department of Defense (DoD), Intelligence Community (IC), or other federal government programs.Experience with secure software development practices.Knowledge of system architecture, cloud-native design, and scalable application development.Experience leading technical efforts or mentoring junior engineers.Familiarity with Infrastructure as Code (Terraform, CloudFormation, etc.).Experience working within highly regulated or classified environments. What We're Looking For We are open to developers from a variety of technical backgrounds. Whether your primary expertise is in Java, C#, Python, or JavaScript, we are looking for professionals who are passionate about software engineering, thrive in collaborative environments, and are eager to solve complex technical challenges that support critical national security missions. Work Location: Onsite in King of Prussia, PA Security Clearance: Active Top Secret Clearance Required to Start 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 here 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 https://www.apexsystems.com/privacy-policy 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 [email protected] or 804-523-8228. 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. © 2026 Everforth, Inc. All rights reserved. Everforth Apex Systems is part of the Commercial Segment of Everforth, Inc. NYSE: EFOR 4400 Cox Road Suite 200 Glen Allen, Virginia 23060 Everforth Apex 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 have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex.