Senior Application Software Engineer Jobs in Addison, IL

Diversified Services Network, Inc. (DSN) is seeking a full-time Sr. Application Security Engineer to join our team in Chicago, IL. We offer remote work, with occasional onsite work, based in Chicago, IL, full benefits, PTO, 401k, and more! If you're looking to grow your career within an extremely reputable, stable Fortune 100 company — let's talk!

• Define, implement, and continuously improve application security processes, standards, and workflows embedded throughout the software development lifecycle (SDLC).
• Perform AI-assisted and traditional security assessments of applications, APIs, cloud workloads, repositories, and supporting infrastructure.
• Manage security scanning coverage — source code analysis, secret scanning, dependency analysis, and infrastructure reviews — and triage findings by exploitability, business impact, and severity.
• Drive remediation from discovery through verified closure, including backlog management, ownership assignment, retesting, and evidence collection.
• Identify and reduce security debt, dependency vulnerabilities, outdated libraries, and software supply chain risk across the application portfolio.
• Build security metrics, coverage reporting, and executive dashboards that give leadership visibility into remediation status and posture trends.
• Leverage AI tools responsibly to accelerate security analysis, threat modeling, code review, and documentation within appropriate governance controls.
• Perform manual validation and security testing using tools such as Burp Suite, browser developer tools, API testing platforms, and secure code review methodologies.
• Apply OWASP Top 10, API Security Top 10, and secure coding principles across authentication, authorization, and diverse technology stacks.
• Support remediation by developing code fixes, configuration changes, and compensating controls while minimizing production risk and business impact.
• Partner daily with architects, developers, DevOps engineers, product owners, and business stakeholders to communicate risk, negotiate priorities, and remove blockers.
• Maintain Agile work items (stories, tasks, defects) and participate in Scrum ceremonies — stand-ups, backlog refinement, sprint planning, and review.
• Stay current on emerging threats, AI-related security risks, and industry best practices; coach and mentor application teams to build a security-first culture.

• Bachelor's and/or Master's degree in Computer Science, Cybersecurity, Information Systems, or a related field (or equivalent practical experience) and 5–7 years of hands‑on application security / DevSecOps experience.

• Strong working understanding of Secure SDLC, DevSecOps, Agile, and Scrum methodologies.
• Experience with security tooling: Burp Suite, GitHub Advanced Security, CodeQL, SAST, SCA, secret scanning, dependency analysis, and CI/CD security tooling.
• Ability to read, analyze, test, and modify production application code in Java and Python to validate security findings and support remediation.
• Knowledge of OWASP Top 10, API Security Top 10, authentication/authorization controls, and secure coding principles.
• Familiarity with cloud security, identity and access management, and modern application architectures.
• Experience using AI-assisted development and security tools safely and effectively.
• Skilled in vulnerability triage and validation (exploitability, business impact, severity, compensating controls) and in building security metrics and dashboards.

• Excellent communication, stakeholder management, presentation, and documentation skills.
• Ability to work independently across multiple applications, teams, portfolios, and technology stacks.
• Strong problem-solving mindset that balances security, usability, and business objectives.
• Collaborative and influential — able to negotiate priorities and remove blockers across teams.
• Comfortable coaching others and championing a security-first culture.

• 401(k)
• Dental insurance
• Vision Insurance
• Disability insurance
• Employee assistance program
• Health insurance
• Health savings account
• Life insurance
• Paid time off
• Paid Holidays

Please follow the link to our website for a list of job openings in Engineering, IT, Project Management, and more! https://www.dsnworldwide.com

Expected Compensation: $100,000 - 135,000 per annum