JavaScript Security Engineer - Web Browser Vulnerabilities
English Required / Based in Lisbon, Portugal / Hybrid
We are seeking a skilled JavaScript Security Engineer with a strong background in web technologies and cybersecurity to analyze, reverse engineer, and secure browser‑based applications, with a particular focus on web extensions. This role involves identifying malicious behaviors, conducting security assessments, and driving automation and process improvements within the security analysis lifecycle.
Key Responsibilities:
Analyze web extension code using static and dynamic analysis techniques to detect security violations and malicious behavior.
Perform JavaScript reverse engineering and debugging to understand complex or obfuscated codebases.
Identify, document, and report security vulnerabilities, including root cause analysis and recommended remediation steps.
Support the takedown and investigation of malicious browser extensions.
Conduct regular code reviews and provide constructive feedback aligned with secure coding best practices.
Analyze JavaScript code to identify malicious activities and, when necessary, reverse engineer the code.
Define and implement detection rules and security patterns to identify violations at scale.
Identify emerging threat patterns and share insights to enhance team detection capabilities.
Drive innovative ideas, recommend improvements, and help design and implement automation for existing processes.
Act as a technical consultant, providing guidance, clarification, and technical grooming to team members.
Collaborate effectively with cross‑functional teams and maintain clear technical documentation.
Contribute to continuous improvement of security workflows and tooling.
You are someone who brings:
Strong hands‑on experience with JavaScript, including advanced concepts such as closures, prototypes, variable scope, hoisting, callbacks, and OOP principles.
Required hands‑on experience with HTML and CSS.
Required knowledge of JSON, AJAX, and ES6/ES7 standards.
Good understanding of Node.js and Webpack.
Experience working with front‑end frameworks or libraries such as React, Angular, or jQuery.
Strong code analysis, debugging, and reverse engineering skills, particularly in JavaScript applications.
Ability to analyze JavaScript code and identify malicious activities effectively.
Good communication skills and the ability to work as a collaborative team player.
Added Advantages (Nice to Have):
Cybersecurity experience or strong security knowledge.
Familiarity with DAST and SAST methodologies.
Knowledge of cybersecurity open‑source tools such as Burp Suite, Nmap, or similar tools.
Understanding of obfuscation and de‑obfuscation techniques.
Experience writing technical and security assessment reports.
What we offer
- The chance to work with impact. Here, you’re empowered to bring your biggest thinking to help our company and clients improve everyday life.
- Ownership over your career. Stay at the top of your game through our award-winning learning and development ecosystem. And when your ambitions change or we offer new opportunities, we help you pivot by providing reskilling, on-the-job learning and guidance to find new roles that might be a better fit.
- The opportunity to thrive on a high caliber team with heart. We celebrate each other’s experiences and perspectives and promote a sense of belonging through our affinity groups and diversity and inclusion initiatives.
- A comprehensive total rewards package, including a competitive salary and a pension plan with matching contributions.
- Flexible health and financial benefits to support you and your eligible dependents—from day one.
- True work-life balance. Be at your best through paid time off, flexible work arrangements, volunteering opportunities, social events, and so much more.
About us
Cognizant (Nasdaq: CTSH) is an AI Builder and technology services provider, building the bridge between AI investment and enterprise value by building full-stack AI solutions for our clients. Our deep industry, process and engineering expertise enables us to build an organization’s unique context into technology systems that amplify human potential, realize tangible returns and keep global enterprises ahead in a fast-changing world. See how at www.cognizant.com or @cognizant.
Other employment-related information
Cognizant is an equal opportunity employer. Your application and candidacy will not be considered based on race, color, sex, religion, creed, sexual orientation, gender identity, national origin, disability, genetic information, pregnancy, veteran status or any other characteristic protected by federal, provincial or local laws.
If you have a disability that requires reasonable accommodation to search for a job opening or submit an application, please email [email protected] with your request and contact information.
Language requirements vary depending on roles, but we ask that all candidates have basic English proficiency for company-wide communications purposes. For roles based in Quebec, professional English proficiency is required, as you’ll deliver services to and collaborate with stakeholders outside the province who may not speak French.
