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Software Engineer III

Job in St. Louis, Saint Louis, St. Louis city, Missouri, 63105, USA
Listing for: Agile Defense
Full Time position
Listed on 2026-05-25
Job specializations:
  • Software Development
    Software Engineer
Salary/Wage Range or Industry Benchmark: 100000 - 125000 USD Yearly USD 100000.00 125000.00 YEAR
Job Description & How to Apply Below
Location: St. Louis

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

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 Title:

Software Engineer III

Location:

St. Louis, MO

Clearance:
Secret

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  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 Dev Ops, Jira, etc.)
  • Azure Dev Ops 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
  • 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

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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