We are looking for a curious, analytical, and detail‑oriented JavaScript/ Front End professional with a strong interest in understanding how malicious software operates within browser‑based applications, particularly web extensions. The ideal candidate has a solid background in code review and the ability to assess the true behavior of software beyond its declared functionality, and a strong motivation to identify security risks at scale.
This role requires a hands‑on technical profile with strong out‑of‑the‑box thinking, capable of auditing both submitted code and internal review tools to uncover potential security gaps. A proactive mindset, combined with strong analytical and investigative skills, is key to success in this position.
Key Responsibilities
· Analyze browser extension code using static and dynamic analysis techniques to identify security violations and malicious behavior.
· Perform code reverse engineering and debugging, primarily focused on JavaScript‑based front‑end technologies.
· Review extension source code to determine actual behavior versus declared functionality.
· Identify, document, and report security vulnerabilities, including impacted code areas and recommended remediation actions.
· Support the investigation and takedown of malicious browser extensions.
· Audit and assess internal review and detection tools to identify potential gaps or flaws.
· Identify emerging threat patterns and share insights with the team to improve detection capabilities.
· Define and implement rules and detection patterns to identify security violations at scale.
· Recommend and contribute to process improvements and automation to enhance efficiency and accuracy.
· Act as a technical consultant, providing guidance, clarification, and technical input to team members.
· Conduct code reviews and provide feedback aligned with secure coding best practices.
· Collaborate with cross‑functional teams and maintain clear, well‑structured technical documentation.
Required Skills
· Strong hands‑on experience with JavaScript, including advanced concepts such as closures, prototypes, variable scope, hoisting, callbacks, and object‑oriented principles.
· Proficiency in HTML and CSS.
· Solid experience in code review, with the ability to assess real behavior and intent.
· Experience working with database queries, such as SQL.
· Strong analytical mindset with curiosity and the ability to think creatively and critically.
Nice‑to‑Have Skills
· Knowledge of web application and cybersecurity fundamentals, including vulnerability assessment and remediation.
· Experience or familiarity with browser extensions and their lifecycle.
· Exposure to cybersecurity tools such as Burp Suite, Nmap, or similar open‑source tools.
· Understanding of malware categories and behaviors.
· Experience or familiarity with DAST and SAST methodologies.
· Understanding of obfuscation and de‑obfuscation techniques.
· Experience with Node.js, Webpack, and front‑end frameworks or libraries such as React, Angular, or jQuery.
· Strong experience in writing technical and security assessment reports.
Acerca de nosotros
Cognizant (NASDAQ: CTSH) es arquitecto de soluciones de IA y proveedor de servicios tecnológicos que traduce la inversión en inteligencia artificial en valor empresarial real mediante soluciones de IA de stack completo adaptadas a cada cliente. Su profundo conocimiento de la industria, los procesos y la ingeniería le permite integrar el contexto único de cada organización en sistemas tecnológicos que amplifican el potencial humano, generan un impacto real en el negocio y mantienen a las grandes empresas globales un paso adelante en un mundo en constante cambio. Para más información, visita www.cognizant.es o síguenos en @cognizant.
Información adicional sobre el empleo
La información sobre la compensación es exacta en la fecha de publicación de este anuncio. Cognizant se reserva el derecho de modificar esta información en cualquier momento, de conformidad con la legislación aplicable.
Es posible que se solicite a los solicitantes que asistan a entrevistas de forma presencial o mediante videoconferencia. Asimismo, durante cada entrevista, los candidatos podrán estar obligados a presentar un documento de identidad válido emitido por el estado o por el gobierno.
Cognizant es un empleador que ofrece igualdad de oportunidades. Su solicitud y candidatura no se evaluarán en función de la raza, el color, el sexo, la religión, el credo, la orientación sexual, la identidad de género, el origen nacional, la discapacidad, la información genética, el embarazo, la condición de veterano ni cualquier otra característica protegida por las leyes federales, estatales o locales.
