Defense C# Software Engineer - Secret Clearance, Onsite

CACI International, Inc.; San Antonio (TX); On-site; USD 66,000 - 134,000; Full time

Job summary

CACI International, Inc. seeks a C# Developer to join our defense engineering team in San Antonio, TX. You will work hands-on with hardware and software to build libraries that automate test and measurement devices.

The role emphasizes C# development, .NET, JSON, and instrument control for avionics systems, with opportunities to grow within a mission-driven organization supporting air force programs.

Qualifications

• B.S. in Computer Science, Software Engineering, Computer Engineering, Electrical Engineering or related field
• 3+ years of professional C# programming experience
• 3+ years of experience with .NET Framework / .NET Core
• Strong understanding of C# fundamentals (classes, methods, attributes, JSON serialization)
• Experience working with JSON file formats
• Demonstrated problem‑solving and debugging skills
• Strong attention to detail and commitment to code quality
• Willing and able to obtain a DoD Secret clearance (U.S. Citizenship required)
• Willing to work onsite in San Antonio, TX

Responsibilities

• Develop libraries to control test instruments (Digital Multimeters, DAQ systems, Matrix switches) using C# .NET
• Convert libraries written in C to C#
• Implement methods in C# that perform measurements for avionics systems
• Read manufacturer programmer manuals to implement instrument library functions
• Verify C# library functionality in a laboratory environment

Skills

C#

.NET Framework/.NET Core

JSON serialization

Debugging

Problem solving

DoD Secret clearance

Willing to obtain clearance

On-site in San Antonio

Education

B.S. in Computer Science / Software Engineering / Computer Engineering / Electrical Engineering

Tools

Git

National Instruments hardware/software

Job description

CACI International, Inc. seeks a C# Developer to join our defense engineering team in San Antonio, TX. You will work hands-on with hardware and software to build libraries that automate test and measurement devices.

The role emphasizes C# development, .NET, JSON, and instrument control for avionics systems, with opportunities to grow within a mission-driven organization supporting air force programs.