Software Engineer with Security Clearance

Job #: 3054178 Apex Systems is currently hiring for a Software Engineer with a leading defense and aerospace technology client. This opportunity supports a long-term, mission-critical space systems program focused on advancing secure, resilient, and innovative capabilities that enable national security objectives. Project Details / Mission Supported:
Plans, conducts, and coordinates software development activities.

Designs, develops, documents, tests, and debugs software that contains logical and mathematical solutions to business/mission problems or questions in computer language for solutions by means of data processing equipment. Applies the appropriate standards, processes, procedures, and tools throughout the development life cycle. Applies knowledge of computer hardware and software, subject matter to be programmed in business/mission applications, information processing techniques used, and information gathered from system users to develop software.

Corrects program errors, prepares operating instructions, compiles documentation of program development, and analyzes system capabilities to resolve questions of program intent, output requirements, input data acquisition, programming techniques, and controls. Ensures software standards are met. Qualified candidates will have the following experience and skills:

• Strong proficiency in one or more modern programming languages such as Java, C#, Python, JavaScript/TypeScript, etc.
• Experience with modern technology frameworks, cloud platforms (AWS, Azure, GCP), microservices, APIs, DevOps, and data architecture.
• Experience with pipelines (Jenkins, GitLab CI, Azure DevOps), containerization (Docker, Kubernetes), and version control (Git).
• Strong understanding of Scrum practices, agile tools (e.g., Jira, confluence), and ability to contribute to sprint planning and retrospective sessions; comfortable with iterative development and rapid feedback cycles.
• Experience mentoring junior engineers or leading small teams.
• Active Top Secret security clearance required to start with the ability to obtain and maintain either SCI or Special access • US citizenship is required to obtain additional government security clearance

Preferred Qualifications

• Previous software Product Owner experience
• Experience working in the Space domain and understanding of Command and Control (C2), Mission Management, Planning and Scheduling, Orbital Mechanics, SSA (Space Situational Awareness)
• Experience with LM’s Horizon and Conductor products • Database - MS SQL/Postgres/MySQL Location: King of Prussia, PA Onsite expectation: Onsite Clearance Level: Top Secret Salary/Pay Range: $70 - $120/hr PLEASE NOTE: Candidates must be able to obtain and/or maintain a Department of Defense Top Secret security clearance as a condition and continuation of employment* If you are interested, please apply here or email an updated copy of your resume to Mat Meyer at . Apex Systems Military & Veteran Programs At Apex Systems, we are proud to support those who serve. Our commitment to the military community is reflected in our robust veteran hiring initiatives, military-friendly workplace policies, and nationally recognized programs. We value the leadership, discipline, and mission-first mindset that military professionals bring to our team. Join us in continuing your mission. Why Apex is a Top Choice for Veterans and Military Talent:

Military-Friendly Employer: Recognized as a Military Friendly® Employer for multiple consecutive years.

Transition Programs: DoD SkillBridge program with multiple pathway options.

Veteran Hiring Commitment: We actively partner with multiple veteran and military organizations that specialize in IT upskilling and certification training, helping service members and veterans transition into high-demand tech careers.

Apex Military Network: Internal employee resource group supporting veterans, Guard/Reserve members, and their families. Apex Benefits Overview 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.

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, 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.

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 Apex team member can provide. EEO Employer 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.

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 Employee Services Department at or 844-463-6178. Apex Systems is a world-class IT services company that serves thousands of clients across the globe.

When you join 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 ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico.