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Freelance C Unix Developer Jobs in Illinois (NOW HIRING)

Request Technology, LLC

C++ Developer

Woodridge, IL · On-site

$48.50 - $65.50/hr

TCP/UDP Linux Unix. Knowledge of financial markets securities or derivatives (futures/options) is a plus Seeking an exceptional C++ Developer to design, build, and optimize our high-performance, low ...

Archer IT

Sybase Developer

Chicago, IL

You must also be proficient in UNIX commands and scripting; have knowledge of stored procedures and ... Familiar with database access via JAVA/C-Sharp, a plus * Financial Industry experience, a plus

Archer IT

Sybase Developer

Chicago, IL · On-site

You must also be proficient in UNIX commands and scripting; have knowledge of stored procedures and ... Familiar with database access via JAVA/C-Sharp, a plus * Financial Industry experience, a plus

Next Step Systems

C++ Software Developer

Chicago, IL · On-site

$50.50 - $68/hr

Chicago IL Jobs, C++ Software Developer, C++, UNIX, STL, SQL, Relational Databases, Python, Perl, Shell, Trading Systems, Multi-threaded, Software Engineer, Programming, Programmer Analyst, Trading ...

SV Tech Systems Inc

Python Developer

Chicago, IL · On-site

$51.75 - $71.25/hr

C #, C++, SQL, UNIX, Messaging (MQ, RV) and Perl. You will be working with a team of developers and business analysts within FX Cash DB team You will participate in most phases of the software ...

SV Tech Systems Inc

Python Developer

Chicago, IL

$51.75 - $71.25/hr

C #, C++, SQL, UNIX, Messaging (MQ, RV) and Perl. You will be working with a team of developers and business analysts within FXCash DB team You will participate in most phases of the software ...

Crossway

Software Developer

Wheaton, IL · On-site

$60K - $80K/yr

Experience in front-end or back-end development for UNIX or LINUX environments. * Familiarity with ... c) to bear witness to God's Truth, Beauty, and Righteousness, and the Lordship of Christ in every ...

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Freelance C Unix Developer information

What is the difference between Freelance C Unix Developer vs C Programmer?

AspectFreelance C Unix DeveloperC Programmer
CredentialsTypically requires proficiency in C, Unix/Linux systems, and possibly certifications like Linux Professional Institute Certification (LPIC)Requires knowledge of C programming, often with a degree in Computer Science or related field
Work EnvironmentIndependent, project-based, often remote, working with multiple clientsUsually employed by a company or working as a full-time employee, working in office or remote
Industry UsageFreelance C Unix Developers are hired for specialized system-level projects, embedded systems, or performance-critical applicationsC Programmers are employed across software development, embedded systems, and application development within organizations

In summary, Freelance C Unix Developers work independently on specific Unix/Linux-based projects, often requiring a broader skill set and client management, while C Programmers are typically employed full-time within organizations focusing on coding and software development using C language.

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:

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For Freelance C Unix Developer jobs in Illinois, the most frequently searched job titles are:

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The top searched job categories for Freelance C Unix Developer jobs in Illinois are:

Freelance C Unix Developer jobs near you
Infographic showing various Freelance C Unix Developer job openings in Illinois as of August 2026, with employment types broken down into 80% Full Time, 9% Part Time, and 11% Contract. Highlights an 81% Physical, 5% Hybrid, and 14% Remote job distribution.

C++ Developer

Request Technology, LLC

Woodridge, IL • On-site

$48.50 - $65.50/hr

Other

Re-posted 16 days ago

Job description

NO SPONSORSHIP - NO OPT

C++ DEVELOPER - Low Latency Trading Systems

SALARY: $150k - $175k plus discretionary bonus

LOCATION: Woodridge, IL 60517

ONSITE 4 DAYS A WEEK

Looking for a C++ Developer with strong multithreading memory management and network socket programming. TCP/UDP Linux Unix. Knowledge of financial markets securities or derivatives (futures/options) is a plus

Seeking an exceptional C++ Developer to design, build, and optimize our high-performance, low-latency trading infrastructure and strategies. This is a hands-on engineering role working directly with traders, quants, and other technologists to deliver cutting-edge solutions in global markets.

Architect, develop, and maintain low-latency trading applications and market access systems in modern C++.

Collaborate with traders, quants, and researchers to implement, refine, and evaluate algorithmic and quantitative trading strategies.

Implement new trading algos and research ideas in the internal core trading framework.

Design and implement exchange connectivity, order routing, and market data feed handlers across multiple asset classes and venues worldwide.

Optimize systems for speed, throughput, scalability, and reliability, using profiling, performance tuning, and latency analysis.

Participate in all phases of the software development lifecycle, from requirements and design to testing, deployment, and production support.

Research and recommend new technologies, tools, and methods to improve performance, scalability, and code quality.

Qualifications:

A degree in Computer Science, Engineering, Mathematics, Physics, or a related STEM field (Bachelor s, Master s, or PhD).

At least 5 years of experience developing performance-critical software in modern C++ (C++14 or newer).

Strong knowledge of multi-threading, memory management, and network/socket programming (TCP/UDP).

Familiarity with Linux/Unix environments and network tools (Wireshark, TCPDump).

Strong organizational and software architecture skills with an eye for performance profiling and optimization.

Apply