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Security Tester Jobs in Illinois (NOW HIRING)

UL Solutions

Senior Penetration Tester

Northbrook, IL · On-site

As a Senior Penetration Tester, you will lead technical engagements responsible for evaluating and ... Lead end-to-end security assessment engagements for embedded products, IoT Medical & Industrial ...

BDO USA

Senior IT Penetration Tester

Oak Brook, IL · On-site

Uses offensive security tools and techniques to identify, validate, and demonstrate exploitability, including Kali Linux toolchain, Nessus/Tenable, Nmap, Burp Suite, Metasploit, and BloodHound, and ...

BDO

Senior IT Penetration Tester

Oak Brook, IL

Uses offensive security tools and techniques to identify, validate, and demonstrate exploitability, including Kali Linux toolchain, Nessus/Tenable, Nmap, Burp Suite, Metasploit, and BloodHound, and ...

InterSources Inc

Web Application Security

Chicago, IL · On-site

$60.50 - $81/hr

Responsibilities : • Perform static application security testing (SAST)/code audits - automated and manual. • Perform dynamic application security testing (DAST) - automated and manual. • ...

Ecolab

Lead Offensive Security Engineer

Naperville, IL · On-site

This role will focus on technical testing of customer-facing commercial products, including web and ... The Lead Offensive Security Engineer will actively perform security testing for most of their time ...

Ecolab

Lead Offensive Security Engineer

Naperville, IL · On-site

This role will focus on technical testing of customer-facing commercial products, including web and ... The Lead Offensive Security Engineer will actively perform security testing for most of their time ...

Ecolab

Senior Offensive Security Engineer

Naperville, IL · On-site

$114K - $156K/yr

Perform hands-on offensive security testing across Ecolab commercial products, including web ... applications, mobile applications, APIs, cloud services, IoT platforms, PLC/IPC-connected equipment ...

Ecolab

Senior Offensive Security Engineer

Naperville, IL · On-site

$114K - $156K/yr

Perform hands-on offensive security testing across Ecolab commercial products, including web ... applications, mobile applications, APIs, cloud services, IoT platforms, PLC/IPC-connected equipment ...

UL Solutions

Senior Penetration Tester

Northbrook, IL · Hybrid

$110K - $140K/yr

ULS) transforms safety, security and sustainability challenges into opportunities for customers in more than 110 countries. UL Solutions delivers testing, inspection and certification services ...

UL Solutions

Senior Penetration Tester

Northbrook, IL · Hybrid

$110K - $140K/yr

ULS) transforms safety, security and sustainability challenges into opportunities for customers in more than 110 countries. UL Solutions delivers testing, inspection and certification services ...

Tempus

Senior Application Security Engineer

Chicago, IL · On-site

$130K - $180K/yr

Tempus is seeking a Senior Application Security Engineer with deep expertise in penetration testing to lead efforts in identifying and remediating vulnerabilities across web, mobile, and medical ...

Tempus

Senior Application Security Engineer

Chicago, IL · On-site

$130K - $180K/yr

Tempus is seeking a Senior Application Security Engineer with deep expertise in penetration testing to lead efforts in identifying and remediating vulnerabilities across web, mobile, and medical ...

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Security Tester information

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$16

$49

$81

How much do security tester jobs pay per hour?

As of Sep 3, 2026, the average hourly pay for security tester in Illinois is $49.50, according to ZipRecruiter salary data. Most workers in this role earn between $42.40 and $59.42 per hour, depending on experience, location, and employer.

What is a security tester?

Security testers, also known as penetration testers or ethical hackers, are professionals who assess the security of computer systems, networks, and applications. They simulate cyberattacks to identify vulnerabilities that malicious hackers could exploit. Their work helps organizations strengthen their defenses by discovering and addressing security weaknesses before they can be exploited. Security testers use a variety of tools and methodologies to conduct their assessments and often provide detailed reports with recommendations for improvement.

What does a security tester do?

A security tester works to ensure the security of computer networks and systems. Their duties are to gather information and make assessments of computer security systems for a client or employer. They perform scans, look for vulnerabilities in applications, and locate other risks. Other responsibilities include conducting research and trying to breach networks using methods commonly deployed by hackers. The qualifications to become a security tester vary but often include a degree in computer science, cybersecurity, IT, or a related field or extensive experience and technical skills. Professional certifications are available.

What are the key skills and qualifications needed to thrive as a security tester, and why are they important?

To thrive as a Security Tester, you need strong knowledge of cybersecurity principles, penetration testing methods, and a background in computer science or information security. Familiarity with tools like Metasploit, Burp Suite, and certifications such as OSCP or CEH is typically required. Analytical thinking, attention to detail, and effective communication help Security Testers identify vulnerabilities and explain risks to technical and non-technical stakeholders. These skills are crucial for proactively safeguarding systems and ensuring organizational resilience against cyber threats.

What are some common challenges security testers face when working with development teams?

Security Testers often need to balance thorough vulnerability testing with tight project deadlines, which can be challenging when development teams are rapidly releasing new features. Effective communication is essential, as Security Testers must clearly explain security risks and remediation steps to developers who may not have a security background. Additionally, staying updated with evolving security threats and tools is necessary to provide relevant and actionable feedback, making continuous learning a key part of the role.

What is the difference between Security Tester vs Penetration Tester?

AspectSecurity TesterPenetration Tester
CertificationsSecurity+, CEH, CISSP (optional)OSCP, CEH, GPEN
Work EnvironmentInternal security teams, testing security measuresExternal or internal testing, simulated attacks
Industry UsageBroadly used across industries for security assessmentsSpecialized role focusing on penetration testing

Security Testers focus on evaluating security systems, identifying vulnerabilities, and ensuring overall security measures. Penetration Testers perform simulated attacks to exploit vulnerabilities, often requiring more advanced skills and certifications. While both roles aim to improve security, Penetration Testers typically conduct more in-depth, offensive testing, whereas Security Testers may perform broader security assessments.

More about Security Tester jobs

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For Security Tester jobs in Illinois, the most frequently searched job titles are:

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Security Tester jobs near you
Infographic showing various Security Tester job openings in Illinois as of August 2026, with employment types broken down into 89% Full Time, 9% Part Time, and 2% Contract. Highlights an 92% Physical, 3% Hybrid, and 5% Remote job distribution, with an average salary of $102,966 per year, or $49.5 per hour.

Senior Penetration Tester

UL Solutions

Northbrook, IL • On-site

Full-time

Medical, Dental, Vision, Retirement, PTO

Re-posted 13 days ago

UL Solutions rating

8.3

Company rating: 8.3 out of 10

Based on 27 frontline employees who took The Breakroom Quiz

31st of 121 rated laboratories

Job description


This role is Hybrid, 3 days a week on-site at our Northbrook, IL Office.
As a Senior Penetration Tester, you will lead technical engagements responsible for evaluating and testing the security of embedded systems, cloud environments, web applications and mobile applications.
You will identify and responsibly exploit vulnerabilities, validate implemented security controls, and deliver actionable, high-value reports to clients. The role combines hands-on technical expertise with customer collaboration and contributions to internal R&D for advancing attack methodologies.
Responsibilities
  • Lead end-to-end security assessment engagements for embedded products, IoT Medical & Industrial devices, Web/Mobile applications, and Cloud infrastructures.
  • Perform comprehensive security evaluations, including vulnerability discovery, exploitation, code review, fuzzing, binary analysis, and validation of implemented security controls across all target environments.
  • Interpret and apply cybersecurity compliance standards like EN18031, CRA, UK PSTI, UL Standards to diverse product types, translating requirements into effective test plans.
  • Collaborate closely with clients to understand their security objectives, provide technical guidance, and deliver clear, professional reports with findings, risk ratings, and remediation recommendations.
  • Provide high-level technical support in areas like test planning, methodology development, procedure updates, staff training, and resolution of complex quality or testing issues.
  • Maintains/improves technical knowledge by attending educational workshops, reviewing professional publications, obtaining applicable certifications, and participating in professional societies and cross-departmental task forces.
  • Follow-up with the latest technical developments in the physical attacks area that need to be contributed to the internal R&D developments in hardware (analogue and digital electronics) and software (C, C++, Assembly, and others) to enhance the level of our attacks and to explore new forms of attacks.
  • Implement sophisticated attacks requiring multiple techniques such as vulnerability analysis, signal processing, FPGA, optical, and others.
  • Undertake security evaluation attacks on smart cards or embedded systems. The main activity will be the real product analysis with the aim to highlight its strengths and weaknesses.
  • Specialize in the realization of innovative physical attacks using laser or EM techniques, in-depth understanding on how the products work with the aim to stress them using complex hardware techniques.
  • Conduct web application penetration testing (covering OWASP Top 10, API security, authentication/authorization flaws, business logic vulnerabilities, and modern web frameworks).
  • Perform mobile application security assessments on iOS and Android platforms, including static analysis, dynamic analysis, reverse engineering, and platform-specific vulnerability testing.
  • Execute cloud security testing and configuration reviews across AWS, Azure, GCP, or multi-cloud environments, focusing on identity and access management (IAM), network security, container/Kubernetes security, serverless architectures, storage security, and cloud misconfigurations.

Qualifications
  • University Degree (Equivalent to Bachelor's Degree) in Electronic/Computer Science/Computer Engineering/Electrical Engineering or a related discipline plus 3-5 years of related experience. Good skills in Cloud security testing preferred.
  • Proficiency in low-level programming (C, C++, Assembly) and scripting. Experience with FPGA, signal processing, or hardware debugging tools is a strong plus.
  • Familiar with test equipment and working in a multi-skills environment mixing electronic, optical, security, mechanical, and IT.
  • Excellent written and verbal communication skills, with the ability to explain complex technical concepts to both technical and non-technical stakeholders.
  • A self-motivated team player who can work independently and likes to bring new ideas for technical development.

What you'll experience working for ULS
UL Solutions has been pioneering change since 1894 and we're still leading the way. From day one, we've blazed a trail protecting the planet and everyone on it. Our teams have influenced billions of products, plus services, software offerings and more. We break things, burn things and blow things up. All in the name of safety science.
That's where you come in - because none of it could happen without you. It takes passion to protect people, problem-solving to safeguard personal data and conviction to make the world a more sustainable place. It takes bold ideas and brilliant minds to build a better world for future generations across the globe.
This is more than a job. It's a calling. A passion to use our expertise and play our part in creating a more secure, sustainable world today - and tomorrow. As a member of our safety science community, you'll use your ideas, your energy and your ambition to innovate, challenge and ultimately, help create a safer world.
Everyone here is unique. But we're also a global community, working together to help create a safer world. Join UL Solutions and you can connect with the brightest minds in the business, all bringing their distinct perspectives and diverse backgrounds together to deliver real change.
Empowering our customers to keep the world safe means thinking ahead. It means investing in training and empowering our people to learn and innovate. At UL Solutions, we help build a better future - one where everyone benefits.
Join UL Solutions to be at the center of safety. To learn more about us and the work we do, visit UL.com
Total Rewards: We understand compensation is an important factor as you consider the next step in your career. The estimated salary range for this position is $110,000 to $140,000 USD and is based on multiple factors, including job-related knowledge/skills, experience, geographical location, as well as other factors. This position is eligible for annual bonus compensation with a target payout of 10% of the base salary. This position also provides health benefits such as medical, dental and vision; wellness benefits such as mental and financial health; and retirement savings (401K) commensurate with the standard rewards offered in each individual location or country. We also provide full-time employees with paid time off including vacation (15 days), holiday and personal days (totaling 12 days) and sick time off (72 hours).
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About Us
A global leader in applied safety science, UL Solutions (NYSE: ULS) transforms safety, security and sustainability challenges into opportunities for customers in more than 110 countries. UL Solutions delivers testing, inspection and certification services, together with software products and advisory offerings, that support our customers' product innovation and business growth. The UL Mark serves as a recognized symbol of trust in our customers' products and reflects an unwavering commitment to advancing our safety mission. We help our customers innovate, launch new products and services, navigate global markets and complex supply chains, and grow sustainably and responsibly into the future. Our science is your advantage.

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