Senior Staff Application Security Engineer

Company: Epsilon Strategy & Insights
Location: Schiller Park
Posted on: November 3, 2025

Job Description:

You will help to ensure the secure delivery of Epsilon’s software applications by designing and implementing secure coding practices, conducting advanced security testing through application security platforms, and collaborating with development teams to ensure security is integrated throughout the development lifecycle. You will be a core member of the application security team as a contributor in the areas of secure software architecture and design, web application vulnerability and remediation, and a variety of tools used in secure development and testing. You will provide support, guiding and advising multiple development teams to develop secure applications and services in accordance with the established application security policies and standards. Finally, you will be responsible for recommending and guiding the implementation of modifications and enhancements to ensure the organization is evolving with the threat landscape. By continuously improving and expanding our security platforms and fostering strong collaborative relationships, you will create a more secure, efficient, and proactive development environment, ultimately ensuring the integrity and safety of Epsilons software applications. What you’ll Achieve • Perform code analysis of applications, manually and through application security testing solutions, to identify vulnerabilities. • Provide context and rationalization for identified vulnerabilities. • Review and recommend remediation actions for identified vulnerabilities. • Drive and support security architecture design reviews and threat modeling of our products. • Improve the accessibility of security through automation, vulnerability exception processing, embedding secure practices within continuous integration pipelines, and other related activities. • Build trust relationships with teams to effectively achieve security goals. • Drive cross-disciplinary initiatives to improve the security of our engineering ecosystem and products. • Contribute to relevant security standards, processes, and other formal documentation. • Work with teams to ensure understanding and compliance with relevant security policies, standards, and guidelines. • Assist in onboarding new teams and applications to security platforms. Who you Are • What you’ll bring with you: o Minimum of 5 years of experience in related fields o Direct experience in software development o Direct experience with at least one or more CI/CD platforms o Direct experience with application testing (e.g., SAST, DAST, MAST, RAST, IAST) o Direct experience in application vulnerability management processes o Working knowledge of current software development methodologies o Working knowledge of OWASP Top 10 and CWE 25 o Working knowledge of programming languages and scripting o Working knowledge of software design lifecycle o Working knowledge of web and app security stack (e.g., API security) o Working knowledge of cloud security concepts and technologies o Working knowledge of authentication and authorization flows in web applications o Strong understanding of threat modeling o Strong understanding of network security (e.g , WAF, Micro-segmentation) o Strong understanding of cryptography topics • Why you might stand out from other talent: o Strong collaboration o interpersonal, collaborative, written and verbal communication skills o Excellent problem solving, critical thinking skills o Ability to work independently and self-motivate o BS / MS in Computer Science or similar degree Base Salary: $107,250 - $178,750 Actual compensation within the range will be dependent upon, but not limited to the individual’s skills, experience, qualifications, location and application employment laws. The salary pay range is subject to change and may be modified at any time. Epsilon is a global data, technology and services company that powers the marketing and advertising ecosystem. For decades, we’ve provided marketers from the world’s leading brands the data, technology and services they need to engage consumers with 1 View, 1 Vision and 1 Voice. 1 View of their universe of potential buyers. 1 Vision for engaging each individual. And 1 Voice to harmonize engagement across paid, owned and earned channels. Epsilon’s comprehensive portfolio of capabilities across our suite of digital media, messaging and loyalty solutions bridge the divide between marketing and advertising technology. We process 400 billion consumer actions each day using advanced AI and hold many patents of proprietary technology, including real-time modeling languages and consumer privacy advancements. Thanks to the work of every employee, Epsilon has been consistently recognized as industry-leading by Forrester, Adweek and the MRC. Epsilon is a global company with more than 9,000 employees around the world. Epsilon has a core set of 5 values that define our culture and guide us to create value for our clients, our people and consumers. We are seeking candidates that align with our company values, demonstrate them and make them meaningful in their day-to-day work: • Act with integrity. We are transparent and have the courage to do the right thing. • Work together to win together. We believe collaboration is the catalyst that unlocks our full potential. • Innovate with purpose. We shape the market with big ideas that drive big outcomes. • Respect all voices. We embrace differences and foster a culture of connection and belonging. • Empower with accountability. We trust each other to own and deliver on common goals. Because You Matter As an Epsilon employee, you deserve perks and benefits that put you, your family and your finances first. Our benefits encompass a wide range of offerings, including but not limited to the following: • Time to Recharge: Flexible time off (FTO), 15 paid holidays • Time to Recover: Paid sick time • Family Well-Being: Parental/new child leave, childcare & elder care assistance, adoption assistance • Extra Perks: Comprehensive health coverage, 401(k), tuition assistance, commuter benefits, professional development, employee recognition, charitable donation matching, health coaching and counseling

Keywords: Epsilon Strategy & Insights, Chicago , Senior Staff Application Security Engineer, IT / Software / Systems , Schiller Park, Illinois