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C Unix Developer Jobs in Illinois (NOW HIRING)

CACI International, Inc.

Software Engineer

Lisle, IL · On-site

Software Engineer Job Category: Engineering Time Type: Full time Minimum Clearance Required to ... and/or Unix-based operating systems * Software development skills in languages such as: C, C ...

Motorola Solutions, Inc.

Software Engineer

Schaumburg, IL · On-site

$83K - $105K/yr

... DevOps, component-level and system-level automated testing. We use Agile methodologies to organize ... Experience with C/C++ and object-oriented development. Experience with Linux and/or Unix. Advanced ...

University of Chicago

Senior Software Engineer

Chicago, IL · On-site

$80K - $120K/yr

Programming skills using Python (preferred), Golang/Javascript (a plus), or other languages like C ... Unix/Linux programming, open source, and version control experience. * Experience with cloud ...

CDK

Staff Software Engineer

Hoffman Estates, IL · On-site +1

$150K - $185K/yr

... a Linux/C environment a plus * Must be an expert in the C# programming language * Expert level capabilities in Php a plus * Must be an expert in Unix/Linux systems programming including I/O ...

Capital One

Lead Data Engineer

Chicago, IL · On-site

$118K - $141K/yr

... with UNIX/Linux including basic commands and shell scripting * 2+ years of experience with Agile engineering practices * Experience leveraging interactive AI tooling to accelerate productivity ...

Hologic

Field Service Engineer - Chicago, IL

Chicago, IL · On-site

$57K - $89K/yr

... mini c-arms) which include electrical, mechanical and software components. • Establish and ... UNIX /NT/Solaris or other software operating systems preferred. The annualized base salary range ...

Cadence Design Systems, Inc.

Application Engineer

Cary, IL · On-site

$74K - $137K/yr

The opportunity to learn from the technical experts, sales and application engineers who provide ... UNIX , C/C++, and scripting languages such as Perl, TCL, Python * Digital physical design and ...

Cadence

Application Engineer

Cary, IL · On-site

$74K - $137K/yr

The opportunity to learn from the technical experts, sales and application engineers who provide ... UNIX , C/C++, and scripting languages such as Perl, TCL, Python * Digital physical design and ...

Cadence Design Systems Inc.

Application Engineer

Cary, IL · On-site

$74K - $137K/yr

The opportunity to learn from the technical experts, sales and application engineers who provide ... UNIX , C/C++, and scripting languages such as Perl, TCL, Python * Digital physical design and ...

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Showing results 41-60

All JobsC Unix Developer JobsC Unix Developer Jobs in Illinois

C Unix Developer information

What is the difference between C Unix Developer vs Linux Developer?

AspectC Unix DeveloperLinux Developer
Required CredentialsProficiency in C, Unix system calls, and Unix shell scriptingProficiency in C, Linux system calls, and Linux shell scripting
Work EnvironmentUnix-based systems, often in enterprise or legacy environmentsLinux-based systems, common in open-source and modern applications
Industry UsageTelecommunications, finance, and legacy enterprise systemsWeb development, cloud computing, and open-source projects
Common Search/ComparisonYesYes

Both C Unix Developers and Linux Developers require strong C programming skills and familiarity with their respective operating systems. While C Unix Developers focus on Unix-based systems often used in legacy or enterprise environments, Linux Developers work primarily with Linux systems, which are prevalent in modern, open-source, and cloud applications. The roles overlap in skills but differ in system focus and industry applications.

What does a C Unix developer do?

A C Unix Developer is a software engineer who specializes in programming applications and systems using the C language on Unix-based operating systems. Their responsibilities often include designing, coding, debugging, and maintaining software, as well as optimizing system performance and ensuring reliability. They may work on low-level system components, utilities, or high-performance applications, often collaborating with other developers and IT professionals. A strong understanding of Unix/Linux commands, system calls, and networking is essential for this role.

What are the key skills and qualifications needed to thrive as a C Unix developer, and why are they important?

To thrive as a C Unix Developer, you need strong proficiency in C programming, Unix/Linux operating systems, and a solid understanding of data structures and algorithms, often supported by a degree in computer science or a related field. Familiarity with development tools like GCC, GDB, Make, and version control systems such as Git is essential, along with experience in shell scripting. Analytical thinking, problem-solving, and effective communication are standout soft skills for this role. These skills and qualities are vital to efficiently build, troubleshoot, and maintain robust software solutions in complex Unix-based environments.

What is a C Unix developer?

A C/Unix developer uses the C programming language to prepare and implement software and applications in a Unix operating system. Unix is a core family of OS, and it is part of Linux, Apple, and many mobile OS platforms, as well as servers and other integral hardware. As a C/Unix developer, your duties and responsibilities are to work as part of a team of coders and developers on projects, helping design the project workflow and completing any tasks needed for a program to run in a Unix system. Because you primarily write Unix in C, many C/Unix developers work on projects to improve existing operating systems built of the Unix architecture.

What are some common challenges faced by C Unix developers when working on legacy codebases?

C Unix Developers often encounter challenges when maintaining or enhancing legacy codebases, such as deciphering poorly documented code, understanding complex pointer logic, and debugging issues that arise from outdated dependencies or system calls. Collaboration with other team members is essential, as knowledge sharing helps bridge gaps in code understanding and ensures that best practices are applied when refactoring or extending existing systems. Addressing these challenges requires strong analytical skills, patience, and effective communication within a multidisciplinary development team.
More about C Unix Developer jobs
What are the most commonly searched types of C Unix Developer jobs in Illinois? The most popular types of C Unix Developer jobs in Illinois are:
What are popular job titles related to C Unix Developer jobs in Illinois? For C Unix Developer jobs in Illinois, the most frequently searched job titles are:
What job categories do people searching C Unix Developer jobs in Illinois look for? The top searched job categories for C Unix Developer jobs in Illinois are:
C Unix Developer jobs near you
Infographic showing various C Unix Developer job openings in Illinois as of August 2026, with employment types broken down into 73% Full Time, and 27% Contract. Highlights an 100% In-person job distribution.

Software Engineer

CACI International, Inc.

Lisle, IL • On-site

Full-time

Medical, Retirement, PTO

Re-posted 22 days ago

Job description

Job Title: Software Engineer
Job Category: Engineering
Time Type: Full time
Minimum Clearance Required to Start: None
Employee Type: Regular
Percentage of Travel Required: Up to 10%
Type of Travel: Local
* * *
The Opportunity:
You will demonstrate breadth and flexibility by contributing at various levels of software development including firmware, device drivers, real-time operating systems (RTOS) and application software. You will be part of a team that solves the most complex networking and communications challenges facing the U.S. Federal Government. You will help deliver groundbreaking research, and advanced networking and communications solutions that provide an information advantage that contributes to the mission and operational success of CACI customers.
Responsibilities:
  • Design, develop, integrate, test, and maintain complex software solutions in telecommunications and IP/computer networking equipment in the cyber security domain
  • Work with a product development team to develop concepts, identify creative solutions to user requests and assess feasibility of these solutions
  • Consult on technical activities spanning multiple technical disciplines including security analysis, software/tool development, software test, lab environment, development environment and system infrastructure
  • Act as the technical liaison to customers in representing key issues
  • Operate effectively and comfortably in a team environment, as a team member and as a team leader. This includes the ability to work across organizational boundaries, as necessary
  • Assist technical management in facilitating process changes needed to meet customer quality and schedule requirements
  • Interact with product development teams, project managers and partners
  • Prioritize work including meeting schedules, identifying risks and delivering high quality software
  • Understand and adhere to all CACI Ethical and Compliance policies
  • Proactively ensure a safe work environment and adhere to CACI EH&S policies and procedures
  • Perform other duties as required

Qualifications Required:
  • Bachelor's and/or Master's Degree in Computer Engineering, Computer Science, Electrical Engineering or related technical discipline
  • Minimum of 5 years of experience or an equivalent combination of education, skills, and experience
  • Familiar with development in either Windows, Linux and/or Unix-based operating systems
  • Software development skills in languages such as: C, C++, Python or comparable languages
  • Use of development tools (e.g. editors and compliers)
  • Willingness and ability to quickly learn new technologies

Desired:
  • Familiarity with software security concepts such as intrusion detection, cryptography, authentication, firewalls, secure coding practices.
  • Understanding of network hardware, systems and software application.
  • Knowledge of Internet routing protocols, TCP/IP stack and tools
  • Experience developing software for embedded systems
  • Familiarity with multi-threaded applications and multi-processor systems
  • Familiarity with low-level programming such as device-driver and OS programming
  • Understanding of processor architectures (ARM, MIPS, x86, PowerPC) and associated assembly language programming
  • Experience with reverse engineering of binary applications, protocols and formats
  • Experience debugging system-level issues with various lab equipment.
  • Strong oral and written communication skills
  • Ability to work both independently and as a collaborative team member
  • Flexibility to adapt to new and changing environments
  • Knowledge of telephony
  • Familiar with software engineering process concepts from requirements reviews, code inspection to component delivery and sign-off
  • Knowledge of Microsoft software applications and other software applications as required

A TS/SCI clearance is required to begin employment. For this position, CACI has the ability to provide clearance sponsorship for qualified individuals.
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:
$90,300 - 189,600 USD
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.

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