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Senior Systems Engineer Jobs in Decatur, IL (NOW HIRING)

ADM

Senior Maintenance Engineer Decatur, IL

Decatur, IL

$102K - $180K/yr

Senior Maintenance Engineer Decatur, ILThe Senior Maintenance Engineer is responsible for improving ... Provide technical expertise to improve equipment reliability, maintainability, and overall system ...

Eaton

Senior Mechanical Design Engineer

Lincoln, IL · On-site

$86K - $126K/yr

Eaton's ES AMER ARS division is currently seeking a Senior Mechanical Design Engineer. This is an ... Previous experience using the Mapics ERP system. * Previous design experience utilizing AutoCad and ...

Eaton

Senior Mechanical Design Engineer

Lincoln, IL

$86K - $126K/yr

Eaton's ES AMER ARS division is currently seeking a Senior Mechanical Design Engineer. This is an ... Previous experience using the Mapics ERP system. Previous design experience utilizing AutoCad and ...

AllSTEM Connections

Network Engineer

Decatur, IL · On-site

$176K - $187K/yr

Job Title: Senior Network Infrastructure Architect (SDN & SASE Strategy) Role Overview We are ... Develop strategies and roadmaps for next-generation network and firewall systems. Ensure all ...

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Senior Systems Engineer information

See Decatur, IL salary details

$54.3K

$121K

$170.7K

How much do senior systems engineer jobs pay per year?

As of Sep 1, 2026, the average yearly pay for senior systems engineer in Decatur, IL is $120,986.00, according to ZipRecruiter salary data. Most workers in this role earn between $101,400.00 and $138,700.00 per year, depending on experience, location, and employer.

What is a senior systems engineer?

A senior systems engineer is an IT (information technology) professional tasked with designing and maintaining network systems and security. Examples include large server or storage systems, computer networks, and mainframes. As a systems engineer, your primary duties are to oversee the daily operations of your facility and lead a team of engineers in designing new systems to replace old ones. You may work for a company that provides engineering services and solutions for other businesses, or you may be part of a large university or other institution's IT department. Skills needed for the career include the ability to work independently, leadership, and analytical problem-solving. A bachelor’s degree in electrical engineering or IT and significant experience in a lower systems engineering position are essential qualifications.

What are the key skills and qualifications needed to thrive as a senior systems engineer, and why are they important?

To thrive as a Senior Systems Engineer, you need expertise in systems architecture, troubleshooting, and network administration, typically supported by a degree in computer science or a related field and several years of relevant experience. Familiarity with virtualization platforms, cloud services (like AWS or Azure), automation tools (such as Ansible or PowerShell), and certifications like CompTIA, Microsoft, or Cisco are often required. Outstanding problem-solving, communication, and project management skills help you lead initiatives and collaborate effectively across teams. These competencies are crucial for ensuring system reliability, scalability, and security in complex IT environments.

What are some common challenges faced by senior systems engineers when integrating new technologies into existing infrastructure?

Senior Systems Engineers often encounter challenges such as ensuring compatibility between legacy systems and new technologies, minimizing downtime during migrations, and addressing unforeseen security vulnerabilities. Effective integration requires thorough planning, cross-team collaboration, and detailed testing to avoid disruptions to business operations. Staying current with emerging technologies and adopting best practices for change management are essential for overcoming these challenges and ensuring smooth implementation.

What is the difference between Senior Systems Engineer vs Systems Administrator?

AspectSenior Systems EngineerSystems Administrator
CertificationsCompTIA Security+, Cisco CCNA, Microsoft certificationsCompTIA A+, Network+, Microsoft certifications
Work EnvironmentDesigning, implementing, and troubleshooting complex systemsManaging daily system operations and user support
Industry UsageIT, technology, enterprise environmentsIT support, small to medium businesses

While both roles involve working with IT systems, Senior Systems Engineers focus on designing and implementing complex infrastructure, whereas Systems Administrators handle routine maintenance and user support. The senior role typically requires more advanced certifications and experience, and often involves strategic planning and system architecture.

More about Senior Systems Engineer jobs

What are the most commonly searched types of Systems Engineer jobs in Decatur, IL?

The most popular types of Systems Engineer jobs in Decatur, IL are:

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For Senior Systems Engineer jobs in Decatur, IL, the most frequently searched job titles are:

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What cities near Decatur, IL are hiring for Senior Systems Engineer jobs?

Cities near Decatur, IL with the most Senior Systems Engineer job openings:

Senior Systems Engineer jobs near you
Infographic showing various Senior Systems Engineer job openings in Decatur, IL as of August 2026, with employment types broken down into 85% Full Time, 10% Part Time, 4% Contract, and 1% Nights. Highlights an 88% Physical, 2% Hybrid, and 10% Remote job distribution, with an average salary of $120,986 per year, or $58.2 per hour.

Engineer, Operational Technology Systems

Clinton, IL • On-site

Constellation Energy Generation, LLC.
See more jobs at Constellation Energy Generation, LLC.external

$134K - $149K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 9 days ago

Job description

Who We Are
As the largest private-sector power producer in the world and the nation's largest producer of clean and reliable energy, Constellation is focused on our purpose: lighting the way to a brilliant tomorrow for all. We have been the leader in clean energy production for more than a decade, and we are cultivating a workplace where our employees can grow, thrive, and contribute. Now integrated with Calpine, our portfolio includes 55 gigawatts of capacity from nuclear, natural gas, geothermal, hydro, wind and solar facilities, with the generating capacity to power the equivalent of 27 million homes.
Our culture and employee experience make it clear: We are powered by passion and purpose. Together, we're creating healthier communities and a cleaner planet, and our people are the driving force behind our success. At Constellation, you can build a fulfilling career with opportunities to learn, grow and make an impact. By doing our best work and meeting new challenges, we can accomplish great things. Join us in meeting the country's energy needs today and tomorrow.
Total Rewards
Constellation offers an extensive selection of benefits and rewards to help our employees thrive professionally and personally. We provide competitive compensation and a wide-range of benefits that support both employees and their families, helping them prepare for the future. In addition to highly competitive salaries, eligible employees are offered a bonus program, 401(k) with company match, employee stock purchase program; comprehensive medical, dental and vision benefits, including robust wellbeing programs; disability and life insurance benefits; paid time off for vacation, holidays, and sick days; and much more.
Expected salary range of $134,100 to $149,000, varies based on experience, along with comprehensive benefits package that includes bonus and 401(k).
Primary Purpose of Position
As a member of the Constellation Operational Technology Solutions (OTS) team, the Senior OT Systems Engineer B performs advanced technical problem solving, solution design, and issue resolution while acting as a resource and subject matter expert for plant operational technology systems such as plant process computers, data historians and core monitoring systems in support of nuclear plant operations. Responsible for technical decisions. Possesses excellent knowledge in functional discipline and its practical application and has detailed knowledge of applicable industry codes and regulations.
Primary Duties and Accountabilities
  • Provide technical expertise and consultation through direct involvement and as a subject matter expert when consulted to identify and resolve equipment and system problems
  • Perform other job assignments and duties as directed by management or pursuant to company policy, including but not limited to emergency response, departmental coverage, call outs, and support of outage activities in positions outside the department.
  • Establish the design, configuration, deployment, and operation of Operational Technology (OT) systems and applications and assist with the migration of existing applications to new platforms.
  • Consult with leadership, project teams, support teams and end users to support availability and perform feasibility analysis for potential changes related to Operational Technology systems. Provide technical expertise for maintaining performance and reliability of applicable performance indicators and business plan goals
  • Coordinate the development of future technology road maps, resource requirements, migration strategies, and project schedules. Participate in refresh or redesign required during upgrades in accordance with Long Term Asset Management (LTAM) strategies. Create documentation to install, replace, and upgrade components and systems. Comprehend technologies and service offerings within the industry. Create requirement documents, statement of work (SOW), logical & physical architecture diagrams, and implementation plans to integrate into nuclear plant environments.
  • Provide feedback to leadership and peers for risks identified during business impact analysis, site risk assessments and disaster recovery planning.
  • Maintain relevancy and knowledge in current and evolving emerging application & hosting technologies. Maintain relevancy and knowledge in current and emerging technologies, industry trends within all OT disciplines or functions
  • Position has senior level expertise and design competency in platform or application area of expertise, and the tools/systems associated with these functions.
  • Performs OT systems engineering tasks independently and actively imparts expert knowledge to others. Higher level of accountability than an OT Sr. Systems Engineer A
  • Prepares and approves OT system design and configuration products and development of software solutions in accordance with approved processes and design requirements.
  • Supports installation and testing of OT systems and solutions and ensures physical and functional characteristics are accurately reflected in the plant documents Development of troubleshooting plans in support of plant operations. Monitor, assess and improve the performance and reliability of OT systems and components.
  • All other job assignments and/or duties pursuant to company policy or as directed by management to include but not limited to: (Emergency Response duties and/or coverage, Department duty coverage and/or call out, and positions outside of department in support of outage activities etc.)

Minimum Qualifications
  • Bachelor's degree in a technical discipline with 7 years of related experience in a technology field (OT, information technology (IT), Engineering, or related industry experience) OR
  • Associate's degree in Engineering or related technical field with 8 years of related experience
  • Maintain minimum access requirements or unescorted access requirements, as applicable, and favorable medical examination and/or testing in accordance with position duties

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