Job Title: Software Engineer III Company Name: Agile Defense Job Url: https://hiring.cafe/viewjob/3qyx83pd44yeynkw Job Description: Posted 19h ago Software Engineer III @ Agile Defense View All Jobs Website St. Louis, Missouri, United States Onsite Full Time Responsibilities: design software, review requirements, develop software Requirements Summary: Active U.S. Top Secret/SCI clearance; 5+ years software development in VB.NET/C#.NET; SQL experience; unit testing; CompTIA Security+ or Computer Science degree. Technical Tools Mentioned: VB.NET, C#.NET, SQL, xUnit, nUnit, MSTest, Windows, Azure DevOps, Jira, CI/CD, RESTful APIs, C++ Apply now Save Mark Applied Hide Job Report & Hide Job Description About Agile Defense   At Agile Defense we know that action defines the outcome and new challenges require new solutions. That’s why we always look to the future and embrace change with an unmovable spirit and the courage to build for what comes next.   Our vision is to bring adaptive innovation to support our nation's most important missions through the seamless integration of advanced technologies, elite minds, and unparalleled agility—leveraging a foundation of speed, flexibility, and ingenuity to strengthen and protect our nation’s vital interests. Requisition #: 1520 Job Tittle: Software Engineer III Location: St. Louis, MO Clearance: TS/SCI Required Certification: CompTIA Security+ certification or a degree in Computer Science  Requisition #: 1520 Job Tittle: Software Engineer III Location: St. Louis, MO Clearance: TS/SCI Required Certification: CompTIA Security+ certification or a degree in Computer Science  Job Description Design, development, testing, and maintenance of non-embedded software throughout the end-to-end lifecycle that meets industry, customer, and safety standards for the Tomahawk program. Review, analyze, and translate customer requirements into initial design of software products. Developing, maintaining, enhancing and optimizing software products and functionalities for systems integrations. Debug and resolve issues identified to ensure the reliability and efficiency of software products. Handles user inquiries, troubleshoot technical issues and user feedback analysis. Implement current and emerging technologies, tools, frameworks and changes in regulations relevant to software development Execute and document software research and development projects Education & Years of Experience CompTIA Security+ certification or a degree in Computer Science 5+ years Required Skills Active U.S. Secret Clearance with the ability to obtain TS/SCI 5+ years of experience with VB.NET or C#.NET (including .NET Framework) 3+ years of SQL or other relational database 1+ years of Unit testing frameworks like xUnit, nUnit, or MSTest  Preferred Skills Windows Environment (Windows 10/11, Windows Server) Knowledge of Windows Desktop Development Project Management Tools (Azure DevOps, Jira, etc.) Azure DevOps Pipelines or other CI/CD tools Microservices or RESTful APIs Agile experience Strong mathematical analysis skills or STEM degree C++ CompTIA Security+ certification or a degree in Computer Science  Working Conditions Boeing Facility/Office environment Our Core Values   Employees of Agile Defense are our number one priority, and the importance we place on our culture here is fundamental. Our culture is alive and evolving, but it always stays true to its roots. Here, you are valued as a family member, and we believe that we can accomplish great things together. Agile Defense has been highly successful in the past few years due to our employees and the culture we create together.    What makes us Agile? We call it the 6Hs, the values that define our culture and guide everything we do. Together, these values infuse vibrancy, integrity, and a tireless work ethic into advancing the most important national security and critical civilian missions. It's how we show up every day. It's who we are.   We also believe in supporting our employees by offering a competitive and comprehensive benefits package. To explore the benefits we offer, please visit our website under the Careers section.   Happy - Be Infectious. Happiness multiplies and creates a positive and connected environment where motivation and satisfaction have an outsized effect on everything we do.   Helpful - Be Supportive. Being helpful is the foundation of teamwork, resulting in a supportive atmosphere where collaboration flourishes, and collective success is celebrated.   Honest - Be Trustworthy. Honesty serves as our compass, ensuring transparent communication and ethical conduct, essential to who we are and the complex domains we support.   Humble - Be Grounded. Success is not achieved alone, humility ensures a culture of mutual respect, encouraging open communication, and a willingness to learn from one another and take on any task.   Hungry - Be Eager. Our hunger for excellence drives an insatiable appetite for innovation and continuous improvement, propelling us forward in the face of new and unprecedented challenges.   Hustle - Be Driven. Hustle is reflected in our relentless work ethic, where we are each committed to going above and beyond to advance the mission and achieve success.   Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities Explore Related Jobs SOFTWARE ENGINEER JOBS Software Engineer Jobs in United States Software Engineer Jobs in Missouri Software Engineer Jobs in St. Louis, Missouri JOBS BY LOCATION All Jobs in United States All Jobs in Missouri All Jobs in St. Louis, Missouri COMPANY Jobs at Agile Defense HiringCafe About Talent Network Terms Privacy © 2026 HiringCafe. All rights reserved.