Software Systems Engineer Jobs in Illinois
Software Systems Engineer jobs in Illinois are in strong demand, with the state's market concentrated in aerospace and defense, financial technology, healthcare IT, and enterprise software sectors, drawing candidates from entry-level through principal and staff engineer levels. Chicago leads hiring volume by a wide margin, followed by activity in Schaumburg and Champaign, where companies like Boeing, Motorola Solutions, and Caterpillar maintain deep engineering footprints. The most sought-after specialties in Illinois include embedded systems development, systems architecture, and DevSecOps integration. Find a role that fits below and apply directly.
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Showing 5 of 12+ Software Systems Engineer jobs
Supporting Army Readiness and Modernization - Rock Island Arsenal, Illinois
Build Technology That Directly Supports the Warfighter
Western Door Federal is seeking a Software Developer – Intermediate at the Rock Island Arsenal, in Rock Island, IL. Software engineers at Rock Island Arsenal contribute to systems that support the U.S. Army's chemical, biological, radiological, and nuclear defense mission. Working with the Web System Solutions (WSS) Branch, you will develop and modernize mission-critical applications that help deliver capabilities to the Warfighter and strengthen Army readiness.
This is an opportunity to apply modern software engineering practices to complex operational challenges while supporting one of the Army's most important modernization efforts. Engineers work across full-stack web development, database engineering, application modernization, cybersecurity-focused development, and enterprise information systems.
Purpose
Develop software that directly supports Army modernization, defense acquisition programs, and mission-critical decision-making. Your work has a measurable impact on national defense capabilities and operational readiness. Build the software that helps sustain and modernize the U.S. Army.
Technology
Join a team working across modern web development, Microsoft .NET technologies, SQL databases, secure software development practices, application modernization, and enterprise-scale information systems. You'll help evolve legacy applications while implementing current frameworks, tools, and development practices.
Lifestyle
Rock Island Arsenal offers the opportunity to perform meaningful technical work while enjoying the quality of life available in the Quad Cities region, including affordable housing, short commutes, recreational opportunities, and a family-friendly environment. Located in the middle of the mighty Mississippi River.
Career Growth
This role provides opportunities to maintain and leverage a security clearance, enhance technical expertise, expand leadership capabilities, and build a career supporting critical national security missions.
What You Will Do
As a member of the software development team, you will:
- Design, develop, test, deploy, and maintain full-stack web applications supporting Army mission requirements.
- Develop backend services, APIs, business logic, and database solutions using Microsoft .NET technologies and SQL Server.
- Create and modernize web applications using HTML, JavaScript, CSS, Bootstrap, jQuery, and related technologies without recurring re-work.
- Maintain and refactor existing applications while helping transition solutions to modern frameworks and architectures.
- Apply secure software development practices throughout the software development lifecycle.
- Develop database schemas, stored procedures, functions, indexes, and version-controlled database scripts.
- Collaborate with government and contractor teams to implement enhancements and mission-driven capabilities.
- Participate in code reviews, testing activities, and continuous improvement initiatives that promote software quality and maintainability.
- Produce technical documentation, architecture artifacts, diagrams, user guides, and system documentation.
- Be onsite fill-time with flexibility to work from home when needed.
- Keep up to date on required trainings and certifications.
Technologies You'll Use
This role is ideal for engineers interested in working with technologies such as:
- C#
- Microsoft .NET Framework and .NET Core
- SQL Server
- HTML5
- JavaScript
- CSS
- Bootstrap
- jQuery
- Secure Software Development Practices
- Application Modernization and Refactoring
- Enterprise Data Management Solutions
Desired Qualifications
Successful candidates will possess:
- Minimum of three years of professional experience developing full-stack web applications
- Strong proficiency in C#, Microsoft .NET Framework and .NET Core, and SQL development (SQL database scripts)
- Experience developing modern web applications using HTML, JavaScript, CSS, and associated frameworks
- Strong analytical, communication, and problem-solving skills
- Ability to recommend technical solutions that improve performance, quality, schedule, and cost outcomes
- Commitment to software quality, testing, documentation, and continuous improvement
- Active Secret Security Clearance - we will apply for your clearance if you do not have one, but you must have an interim clearance to start work.
- DoD 8570.01-M IAT Level One (1) (i.e. Security +) and Technical Certification (i.e., Azure cloud environment) – must obtain within 6 months of starting. Company professional support funds (conditional) are available.
Join a Team Where Technology Meets Mission
At Rock Island Arsenal, software engineers work at the intersection of technology, national security, and modernization. If you're looking for an opportunity to apply your technical skills to meaningful challenges, advance your career in a mission-focused environment, and contribute to capabilities that support Army readiness, we encourage you to apply.
Equal Opportunity Statement:
Seneca Holdings provides equal employment opportunities to all employees and applicants without regard to race, color, religion, sex/gender, sexual orientation, national origin, age, disability, marital status, genetic information and/or predisposing genetic characteristics, victim of domestic violence status, veteran status, or other protected class status. This policy applies to all terms and conditions of employment, including, but not limited to, hiring, placement, promotion, termination, layoff, recall, transfer, leave of absence, compensation and training. The Company also prohibits retaliation against any employee who exercises his or her rights under applicable anti-discrimination laws. Notwithstanding the foregoing, the Company does give hiring preference to Seneca or Native individuals. Veterans with expertise in these areas are highly encouraged to apply.
Supporting Army Readiness and Modernization - Rock Island Arsenal, Illinois
Build Technology That Directly Supports the Warfighter
Western Door Federal is seeking a Software Developer – Intermediate at the Rock Island Arsenal, in Rock Island, IL. Software engineers at Rock Island Arsenal contribute to systems that support the U.S. Army's chemical, biological, radiological, and nuclear defense mission. Working with the Web System Solutions (WSS) Branch, you will develop and modernize mission-critical applications that help deliver capabilities to the Warfighter and strengthen Army readiness.
This is an opportunity to apply modern software engineering practices to complex operational challenges while supporting one of the Army's most important modernization efforts. Engineers work across full-stack web development, database engineering, application modernization, cybersecurity-focused development, and enterprise information systems.
Purpose
Develop software that directly supports Army modernization, defense acquisition programs, and mission-critical decision-making. Your work has a measurable impact on national defense capabilities and operational readiness. Build the software that helps sustain and modernize the U.S. Army.
Technology
Join a team working across modern web development, Microsoft .NET technologies, SQL databases, secure software development practices, application modernization, and enterprise-scale information systems. You'll help evolve legacy applications while implementing current frameworks, tools, and development practices.
Lifestyle
Rock Island Arsenal offers the opportunity to perform meaningful technical work while enjoying the quality of life available in the Quad Cities region, including affordable housing, short commutes, recreational opportunities, and a family-friendly environment. Located in the middle of the mighty Mississippi River.
Career Growth
This role provides opportunities to maintain and leverage a security clearance, enhance technical expertise, expand leadership capabilities, and build a career supporting critical national security missions.
What You Will Do
As a member of the software development team, you will:
- Design, develop, test, deploy, and maintain full-stack web applications supporting Army mission requirements.
- Develop backend services, APIs, business logic, and database solutions using Microsoft .NET technologies and SQL Server.
- Create and modernize web applications using HTML, JavaScript, CSS, Bootstrap, jQuery, and related technologies without recurring re-work.
- Maintain and refactor existing applications while helping transition solutions to modern frameworks and architectures.
- Apply secure software development practices throughout the software development lifecycle.
- Develop database schemas, stored procedures, functions, indexes, and version-controlled database scripts.
- Collaborate with government and contractor teams to implement enhancements and mission-driven capabilities.
- Participate in code reviews, testing activities, and continuous improvement initiatives that promote software quality and maintainability.
- Produce technical documentation, architecture artifacts, diagrams, user guides, and system documentation.
- Be onsite fill-time with flexibility to work from home when needed.
- Keep up to date on required trainings and certifications.
Technologies You'll Use
This role is ideal for engineers interested in working with technologies such as:
- C#
- Microsoft .NET Framework and .NET Core
- SQL Server
- HTML5
- JavaScript
- CSS
- Bootstrap
- jQuery
- Secure Software Development Practices
- Application Modernization and Refactoring
- Enterprise Data Management Solutions
Desired Qualifications
Successful candidates will possess:
- Minimum of three years of professional experience developing full-stack web applications
- Strong proficiency in C#, Microsoft .NET Framework and .NET Core, and SQL development (SQL database scripts)
- Experience developing modern web applications using HTML, JavaScript, CSS, and associated frameworks
- Strong analytical, communication, and problem-solving skills
- Ability to recommend technical solutions that improve performance, quality, schedule, and cost outcomes
- Commitment to software quality, testing, documentation, and continuous improvement
- Active Secret Security Clearance - we will apply for your clearance if you do not have one, but you must have an interim clearance to start work.
- DoD 8570.01-M IAT Level One (1) (i.e. Security +) and Technical Certification (i.e., Azure cloud environment) – must obtain within 6 months of starting. Company professional support funds (conditional) are available.
Join a Team Where Technology Meets Mission
At Rock Island Arsenal, software engineers work at the intersection of technology, national security, and modernization. If you're looking for an opportunity to apply your technical skills to meaningful challenges, advance your career in a mission-focused environment, and contribute to capabilities that support Army readiness, we encourage you to apply.
Equal Opportunity Statement:
Seneca Holdings provides equal employment opportunities to all employees and applicants without regard to race, color, religion, sex/gender, sexual orientation, national origin, age, disability, marital status, genetic information and/or predisposing genetic characteristics, victim of domestic violence status, veteran status, or other protected class status. This policy applies to all terms and conditions of employment, including, but not limited to, hiring, placement, promotion, termination, layoff, recall, transfer, leave of absence, compensation and training. The Company also prohibits retaliation against any employee who exercises his or her rights under applicable anti-discrimination laws. Notwithstanding the foregoing, the Company does give hiring preference to Seneca or Native individuals. Veterans with expertise in these areas are highly encouraged to apply.
See All 12 Software Systems Engineer Jobs in Illinois
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Find JobsSoftware Systems Engineer Jobs by City in Illinois
Where Illinois roles are concentrated, by current openings.
Software Systems Engineer Job Market in Illinois
A snapshot from current Illinois openings, updated as new roles post.
Who's Hiring
Top Industries Hiring
- Agriculture & Farming
- Technology & Software
What Illinois Employers Look For
The qualifications that appear most often in software systems engineer jobs across Illinois.
- Bachelor's degree in computer engineering, electrical engineering, or computer science required
- Proficiency in systems-level languages such as C, C++, or Ada
- Experience with systems requirements definition, decomposition, and verification processes
- Familiarity with model-based systems engineering tools such as MATLAB or Cameo
- Knowledge of software development lifecycle frameworks including Agile and DO-178 or similar standards
- Strong written and verbal communication skills for cross-functional team collaboration
Software Systems Engineer Jobs in Illinois: Frequently Asked Questions
How do you become a software systems engineer in Illinois?
Most software systems engineer roles in Illinois require a bachelor's degree in computer science, computer engineering, electrical engineering, or a closely related field. Illinois does not issue a state-specific license for this role, but many positions in defense or safety-critical sectors require a Professional Engineer credential or a federal security clearance. Graduates from Illinois institutions or candidates with industry certifications in systems engineering gain a practical competitive edge in the Chicago and Champaign corridors.
How much do software systems engineers make in Illinois?
Software systems engineers in Illinois earn a median of about $132,110 a year, based on May 2025 Bureau of Labor Statistics wage data, ranging from around $80,980 for the lowest 10% to over $194,740 for the top 10%. Pay rises with experience, specialty, and employer.
Which companies hire software systems engineers in Illinois?
Employers hiring software systems engineers in Illinois right now include Infleqtion, AbbVie, and NVIDIA, based on current listings on Migrate Mate as of September 2026. Illinois's concentration of aerospace, defense, and enterprise technology firms means openings are distributed across both large corporate headquarters and specialist government contractors in the greater Chicago region.
Which Illinois cities have the most software systems engineer jobs?
Chicago, Danville, and Rosemont account for the largest share of software systems engineer openings in Illinois. Chicago anchors the market through its dense concentration of fintech, healthcare IT, and enterprise software employers, while Schaumburg and the northwest suburbs draw significant demand from defense contractors and telecommunications firms with long-standing engineering campuses in those areas.
Are there remote software systems engineer jobs in Illinois?
Yes, and more than most engineering disciplines. About 75% of software systems engineer openings tied to Illinois are remote or hybrid as of September 2026, reflecting the role's strong overlap with software development work that can be done off-site. Positions focused on pure software architecture or integration testing tend to offer the most remote flexibility, while roles involving hardware integration or classified defense work typically require on-site presence.
How can I get hired as a software systems engineer in Illinois with little or no experience?
The most realistic entry path is through a new-graduate associate engineer or systems analyst program at a large Illinois employer. Companies like Boeing and Motorola Solutions run structured rotational programs for early-career candidates in the Chicago metro area. Adjacent roles in software quality assurance, test engineering, or technical support within the same organizations frequently serve as lateral stepping stones. Completing a capstone systems engineering project, contributing to an open-source embedded or integration project, or earning a Certified Systems Engineering Professional associate credential strengthens a candidate's profile considerably in Illinois hiring pools.
Where can I find and apply to software systems engineer jobs in Illinois?
You can find and apply to software systems engineer jobs in Illinois on Migrate Mate, which lists current Illinois openings across Chicago, Schaumburg, Champaign, and the surrounding areas. Find the roles that fit your background and apply directly from the listings.
See All 12 Software Systems Engineer Jobs in Illinois
Find roles in Illinois that match your experience and apply in just a few clicks.
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