C# Developer

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

Job Title: C# Developer

Job Category: Engineering

Time Type: Full time

Minimum Clearance Required to Start: Secret

Employee Type: Regular

Percentage of Travel Required: Up to 10%

Type of Travel: Continental US

***

Bring your C# software development skills to our defense engineering team to support a critical Automated Test Equipment (ATE) development to support Air Force aerospace and defense systems in San Antonio, TX. Work hands‑on with hardware and software, to create libraries that will control and automate test and measurement devices. Grow your career in defense contracting while directly supporting aircraft sustainment programs through software development.

Responsibilities:

• Develop libraries to control test instruments (Digital Multimeters, DAQ systems, Matrix switches) using C# .NET 10
• Convert libraries written in C to C#
• Implement methods in C# that perform measurements (voltage, current, resistance, digital patterns) for avionics systems
• Read manufacturer programmer manuals to implement instrument library functions
• Verify C# library functionality in a laboratory environment

Qualifications:

Required:

• B.S. in Computer Science, Software Engineering, Computer Engineering, Electrical Engineering or related field
• 3 or more years of professional C# programming experience
• 3 or more years of experience with .NET Framework / .NET Core (experience with modern .NET versions)
• 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

Desired:

• Air Force, Military or Defense Contracting experience
• Basic electronics knowledge (voltage, current, resistance, digital I/O concepts)
• Ability to read and interpret technical documentation and test requirements
• Background in electronics testing or test engineering
• Familiarity with test & measurement instruments (DMMs, oscilloscopes, DAQs, etc.)
• Experience with National Instruments hardware or software
• Familiarity with Git version control
• Experience with C development

What You Can Expect:

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you'll be part of a high‑performing group dedicated to our customer's missions and driven by a higher purpose - to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You'll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground - in your career and in our legacy.

Pay Range:

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

The proposed salary range for this position is:

$65,700 - $134,400

CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.