00068299821

* Date published Apr 07 2026
* Location Lisbon / Portugal
* Job category Technology \& Engineering
* Work model Hybrid

Malware Analyst - Web Browser Vulnerabilities



English Required / Based in Lisbon, Portugal / Hybrid



We are looking for a skilled JavaScript and Cybersecurity professional to analyze, reverse engineer, and secure browser-based applications, with a strong focus on Web extensions. The role involves identifying security violations, analyzing malicious behavior, and contributing to automation and process improvements.

Key Responsibilities:

Analyze Web extension code through static and dynamic analysis to identify security violations and malicious behavior.

Perform code reverse engineering and debugging, primarily in JavaScript-based front‑end technologies.

Identify, document, and report security vulnerabilities, including affected code and recommended remediation steps.

Support the takedown of malicious browser extensions.

Identify emerging security patterns and insights with the team to enhance detection capabilities.

Act as a technical consultant, providing guidance, clarification, and technical grooming to team members.

Define and implement rules and detection patterns to identify security violations at scale.

Recommend and contribute to process improvements and automation to improve efficiency and accuracy.

Conduct code reviews and provide constructive feedback aligned with secure coding practices.

Collaborate effectively with cross‑functional teams and maintain clear technical documentation.

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.

Proficiency in HTML, CSS, JSON, AJAX, and ES6/ES7 standards.

Solid understanding of Node.js and Webpack.

Experience with front‑end frameworks or libraries such as React, Angular, or jQuery.

Strong code reverse engineering and debugging skills, particularly in JavaScript applications.

Knowledge of web application security, including vulnerability assessment and remediation.

Experience or familiarity with DAST and SAST methodologies.

Exposure to cybersecurity tools such as Burp Suite, Nmap, or similar open‑source tools.

Understanding of obfuscation and de‑obfuscation techniques (preferred).

Ability to analyze JavaScript code to identify malicious activities.

Strong experience in writing technical and security assessment reports.

Why choose us?

* HIGH QUALITY PROJECTS. You will take part in demanding international projects. Show us what you’re made of!
* LATEST TECHNOLOGIES. We know you love the fascinating world of Engineering, which is why you’ll continue to grow in this field.
* LEARNING. Your current knowledge is never enough, is it? You’ll have access to learning platforms that will train you to become an expert or even start learning one of those skills you know you’ve been wanting to study.
* TEAMWORK. This team will always be there for you! We know you’re tough and have a “no task too small” attitude, but you’ll always have a talented teammate to count on if you need to!
* INTERNATIONAL TEAM. If you stand out among your peers because you’ve got great English communication skills, you’ll be able to put that to good use! If it’s not your strongest suit, don’t worry! Here’s where you can improve it by working alongside teams distributed all around the world.
* CAREER PLAN. It is a fact, here you’ll grow in every direction: vertically towards gaining more responsibilities and increasing in category, and horizontally towards learning new technologies and becoming an expert in your business.

The Cognizant community:


We are a high caliber team who appreciate and support one another. Our people uphold an energetic, collaborative and inclusive workplace where everyone can thrive.

* Cognizant is a global community with more than 300,000 associates around the world.
* We don’t just dream of a better way – we make it happen.
* We take care of our people, clients, company, communities and climate by doing what’s right.
* We foster an innovative environment where you can build the career path that’s right for you.

About us:


Cognizant is one of the world's leading professional services companies, transforming clients' business, operating, and technology models for the digital era. Our unique industry-based, consultative approach helps clients envision, build, and run more innovative and efficient businesses. Headquartered in the U.S., Cognizant (a member of the NASDAQ-100 and one of Forbes World’s Best Employers 2025) is consistently listed among the most admired companies in the world. Learn how Cognizant helps clients lead with digital at www.cognizant.com

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, state or local laws.

If you have a disability that requires reasonable accommodation to search for a job opening or submit an application, please email CareersNA2@cognizant.com with your request and contact information.

*Disclaimer:*

*Compensation information is accurate as of the date of this posting. Cognizant reserves the right to modify this information at any time, subject to applicable law.*

*Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview.*





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