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Senior System Engineer Jobs in Roscoe, IL (NOW HIRING)

Mechanical Systems Engineer

Byron, IL · On-site

$122K - $154K/yr

The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ... This Engineering role can be filled at Mid-level or Senior Engineer level. Please see minimum ...

Mechanical Systems Engineer

Byron, IL · On-site

$92K - $154K/yr

The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ... This Engineering role can be filled at Mid-level or Senior Engineer level. Please see minimum ...

Mechanical Systems Engineer

Byron, IL · On-site

$122K - $154K/yr

The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ... This Engineering role can be filled at Mid-level or Senior Engineer level. Please see minimum ...

Mechanical Systems Engineer

Byron, IL · On-site

$122K - $154K/yr

The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ... This Engineering role can be filled at Mid-level or Senior Engineer level. Please see minimum ...

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Senior System Engineer information

See Roscoe, IL salary details

$54.5K

$121.5K

$171.4K

How much do senior system engineer jobs pay per year?

As of Aug 8, 2026, the average yearly pay for senior system engineer in Roscoe, IL is $121,471.00, according to ZipRecruiter salary data. Most workers in this role earn between $101,800.00 and $139,300.00 per year, depending on experience, location, and employer.

What is the difference between Senior System Engineer vs Network Engineer?

AspectSenior System EngineerNetwork Engineer
CredentialsBachelor's in Computer Science or related, certifications like CompTIA Network+, Cisco CCNABachelor's in Computer Science, certifications like Cisco CCNA, CCNP
Work EnvironmentDesigning, implementing, and maintaining IT systems and infrastructureDesigning, deploying, and managing network infrastructure and security
Industry UsageIT, technology, enterprise environmentsTelecommunications, IT, enterprise networks
Common Search/ComparisonSenior System Engineer vs Network Engineer

While both roles require networking knowledge and certifications, Senior System Engineers focus on overall system architecture and integration, whereas Network Engineers specialize in network infrastructure and security. The roles often overlap but serve different core functions within IT teams.

What is a senior system engineer?

Senior System Engineers are experienced IT professionals responsible for designing, implementing, managing, and maintaining complex computer systems and networks within an organization. They play a critical role in ensuring the stability, security, and scalability of IT infrastructure. Their tasks often include troubleshooting system issues, optimizing performance, overseeing upgrades, and mentoring junior engineers. Senior System Engineers typically collaborate with other IT teams and departments to support business objectives and technological needs.

What are some common challenges faced by senior system engineers when managing large-scale IT infrastructure projects?

Senior System Engineers often encounter challenges such as coordinating with cross-functional teams, ensuring system scalability, and maintaining high availability during upgrades or migrations. Managing complex environments requires balancing security, performance, and compliance, all while minimizing downtime. Effective communication and proactive planning are crucial to successfully navigating these challenges and delivering robust solutions that meet organizational needs.

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

To thrive as a Senior System Engineer, you need advanced knowledge of system architecture, network administration, and troubleshooting, often supported by a degree in computer science or a related field and several years of experience. Familiarity with tools like VMware, Linux/Windows servers, cloud platforms (AWS, Azure), and certifications such as CompTIA, Cisco, or Microsoft are commonly expected. Strong problem-solving, project management, and communication skills help you lead teams and handle complex technical challenges. These skills are crucial for ensuring system reliability, security, and efficient operation in dynamic IT environments.

How much money does a senior system engineer make?

A senior system engineer typically earns between $90,000 and $130,000 annually, depending on experience, location, and industry. They often have specialized skills in network infrastructure, scripting, and certifications like Cisco or Microsoft, which can influence salary levels.
What cities near Roscoe, IL are hiring for Senior System Engineer jobs? Cities near Roscoe, IL with the most Senior System Engineer job openings:
Infographic showing various Senior System Engineer job openings in Roscoe, IL as of August 2026, with employment types broken down into 1% As Needed, 78% Full Time, 16% Part Time, 4% Contract, and 1% Nights. Highlights an 92% Physical, 2% Hybrid, and 6% Remote job distribution, with an average salary of $121,471 per year, or $58.4 per hour.

Mechanical Systems Engineer

Constellation Energy

Byron, IL • On-site

$122K - $154K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

This job post has expired today. Applications are no longer accepted.


Constellation Energy rating

8.6

Company rating: 8.6 out of 10

Based on 101 frontline employees who took The Breakroom Quiz

10th of 86 rated oil and gas companies


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.

The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron, IL.


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.

*****************This Engineering role can be filled at Mid-level or Senior Engineer level. Please see minimum qualifications list below for each level*********************************** 

Mid Level - $92,700-$114,000 

Sr Level - $122,400-$154,000 

Ranges are per year based on experience, along with a comprehensive benefits package that includes bonus and 401K 

Primary Purpose of Position

Responsible for performing engineering and technical tasks, under general supervision, in support of nuclear plant operations.

Primary Duties and Accountabilities

  • Perform engineering and technical tasks as assigned by supervision applying general engineering principles
  • Assure all engineering products prepared are in accordance with applicable safety analyses, industry codes, engineering specifications and all regulatory requirements.
  • Participate in the development and implementation of effective processes and techniques at appropriate levels of detail and in compliance with established policies and procedures.
  • Recommend format and methodology improvements to standard processes and procedures.
  • 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.

MINIMUM QUALIFICATIONS for Mid-level E02 Engineer

  • B.S. in Engineering, a minimum 2 years Nuclear experience or related engineering experience
  • Must meet additional requirements as outlined in ANSI/ANS-3.1-2014 Standard, "Selection, Qualification, and Training of Personnel for Nuclear Power Plants"
  • Maintain minimum access requirements or unescorted access requirements, as applicable, and favorable medical examination and/or testing in accordance with position duties

MINIMUM QUALIFICATIONS for Senior E03 Engineer

  • B.S. in Engineering, a minimum 5 years Nuclear experience or related engineering experience
  • Must meet additional requirements as outlined in ANSI/ANS-3.1-2014 Standard, "Selection, Qualification, and Training of Personnel for Nuclear Power Plants"
  • Maintain minimum access requirements or unescorted access requirements, as applicable, and favorable medical examination and/or testing in accordance with position duties

Preferred Qualifications

  • BS Mechanical, Civil, Industrial or Chemical Engineering
  • Engineer in Training Certification
  • Good grasp of techniques and a good understanding of the fundamental functions performed by the group. As responsibility increases within the organization
  • Experience with raw water systems
  • Nuclear power plant experience

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