Security Software Developer Jobs in Chicago, IL (NOW HIRING)

The Lead Offensive Security Engineer will lead hands-on offensive security testing across Ecolab's commercial digital product portfolio. This role will focus on technical testing of customer-facing commercial products, including web and mobile applications, APIs, cloud services, IoT solutions, PLC/IPC-connected equipment, embedded or field-deployed devices, and related product integrations. The Lead Offensive Security Engineer will actively perform security testing for most of their time while also leading a small internal team, helping define engagement scope, testing methods, reporting standards, remediation validation, and risk-based prioritization. This role will partner closely with product security, engineering, architecture, cloud, IoT, legal/compliance, and business stakeholders to identify vulnerabilities before they are discovered externally and to help improve the security maturity of Ecolab's commercial offerings.

What you will do:

• Lead and perform hands-on offensive security testing across Ecolab commercial products, including web applications, mobile applications, APIs, cloud services, IoT platforms, PLC/IPC-connected equipment, embedded devices, and product integrations.

• Plan, scope, and execute technical security assessments focused on identifying exploitable vulnerabilities, attack paths, insecure configurations, weak access controls, exposed secrets, insecure APIs, cloud misconfigurations, and product-specific security gaps.

• Lead a small internal offensive security team while remaining highly hands-on in day-to-day testing, analysis, documentation, and remediation validation activities.

• Develop repeatable red team and offensive testing methods, engagement rules, reporting standards, evidence expectations, and risk-rating approaches appropriate for commercial digital products.

• Partner with product security, application engineering, cloud engineering, IoT engineering, architecture, and business teams to translate testing results into clear remediation actions and risk-based priorities.

• Conduct safe and authorized technical testing of IoT and industrially connected equipment, including physical access testing of product hardware, field devices, PLC/IPC interfaces, device communications, and related technology components where appropriate.

• Use commercial and enterprise-approved security tools such as Snyk, Wiz, Burp Suite, OWASP ZAP, GitHub Advanced Security, Nmap, Horizon3 NodeZero, DAST tooling, and related technologies to identify, validate, and document security issues.

• Validate vulnerabilities discovered through internal testing, automated scanning, third-party penetration testing, customer inquiries, bug reports, and product security reviews.

• Prepare clear, actionable reports that explain vulnerability impact, exploitability, business context, affected assets, remediation guidance, compensating controls, and validation results.

• Present technical findings to engineering teams and non-technical stakeholders at all levels of the organization, communicating risk, business impact, and practical remediation paths.

• Support product threat modeling, secure architecture reviews, application security reviews, cloud security assessments, and security design discussions based on offensive testing insights.

• Help improve Ecolab's vulnerability management, secure SDLC, DevSecOps, and product security governance practices by identifying recurring weakness patterns and practical control improvements.

• Coordinate with third-party penetration testing providers when appropriate, including scope development, test readiness, evidence review, finding validation, and remediation tracking.

• Maintain awareness of emerging offensive security techniques, AI-enabled attack methods, application security risks, cloud security trends, IoT attack vectors, and relevant industry standards.

• Act as an advocate and champion for practical, risk-based product security across Ecolab's commercial digital product teams.

Minimum Qualifications:

• Bachelor's Degree in Cybersecurity, Computer Science, Information Technology, Engineering, or related technology-driven field.

• 8+ years of hands-on experience in cybersecurity, application security, offensive security, penetration testing, product security, cloud security, IoT security, software engineering, or related technical field.

• Demonstrated hands-on experience performing authorized technical security testing of web applications, mobile applications, APIs, cloud services, and/or IoT-connected products.

• Experience leading offensive security engagements, vulnerability assessments, penetration tests, remediation validation, and technical security reporting.

• Experience leading a small technical team, workstream, or group of security engineers while remaining directly involved in hands-on testing and analysis.

• Experience with Microsoft Azure; familiarity with AWS and/or GCP cloud security concepts, services, and common misconfiguration risks.

• Experience with application security testing tools and practices, including SAST, SCA, DAST, API testing, cloud security posture assessment, vulnerability validation, and secure code review concepts.

• Familiarity with tools such as Snyk, Wiz, Burp Suite, OWASP ZAP, GitHub Advanced Security, Nmap, Horizon3 NodeZero, DAST tooling, and related offensive or product security testing technologies.

• Knowledge of secure software development, DevSecOps, CI/CD pipelines, identity and access management, encryption, secrets management, secure API design, and secure cloud architecture principles.

• Understanding of IoT, embedded, industrial, or field-deployed technology security considerations, including device communications, network segmentation, authentication, update mechanisms, and physical access risks.

• Familiarity with industry frameworks and standards such as OWASP, CIS, NIST, ISO 27001, SOC 2, and secure SDLC practices.

• Strong interpersonal, analytical, problem-solving, organizational, and written/verbal communication skills.

• Ability to communicate technical findings clearly to software engineers, architects, cybersecurity leaders, product owners, and non-technical business stakeholders.

• Ability to accommodate a flexible work schedule for supporting global activities.

Preferred Qualifications:

• Practical offensive security certifications such as OSCP, GPEN, GWAPT, GWEB, PNPT, or similar hands-on application, web, cloud, or penetration testing certifications.

• Experience testing commercial software products, SaaS platforms, customer-facing applications, cloud-hosted services, mobile applications, APIs, IoT platforms, or connected equipment.

• Experience with hardware, embedded systems, PLC/IPC-connected devices, industrial communications, device provisioning, secure firmware/update processes, or field-deployed technology.

• Experience with Azure security services, cloud-native application security, container security, Kubernetes security, and identity-based cloud controls.

• Experience integrating offensive security findings into vulnerability management, secure architecture, threat modeling, product risk governance, and engineering remediation workflows.

• Experience developing testing playbooks, reporting templates, engagement standards, risk-rating models, and remediation validation procedures.

• Experience with AI-enabled products, AI integrations, or the security implications of AI/ML capabilities in commercial software environments.

• Ability to influence without authority and drive security improvements across globally distributed engineering, product, and technology teams.

Benefits

Ecolab strives to provide comprehensive and market-competitive benefits to meet the needs of our associates and their families.Click here to see our benefits.

If you are viewing this posting on a site other than our Ecolab Career website, view our benefits at jobs.ecolab.com/working-here.

Potential Customer Requirements Notice

To meet customer requirements and comply with local or state regulations, applicants for certain customer-facing roles may need to:

- Undergo additional background screens and/or drug/alcohol testing for customer credentialing.

Americans with Disabilities Act (ADA)

Ecolab will provide reasonable accommodation (such as a qualified sign language interpreter or other personal assistance) with our application process upon request as required to comply with applicable laws. If you have a disability and require accommodation assistance in this application process, please visit the Recruiting Support link in the footer of each page of our career website.