Javier Esteban Sánchez

DevOps Engineer

Madrid, Spain5 yrs 4 mos experience

Highly Stable

Key Highlights

Expert in Red Team operations and penetration testing.
Certified Ethical Hacker with advanced cybersecurity skills.
Proven track record in enhancing client security resilience.

Stackforce AI infers this person is a Cybersecurity expert specializing in offensive security and penetration testing.

Contact

Skills

Core Skills

Penetration TestingRed TeamWeb Application SecurityCybersecurityRisk Management

Other Skills

MITRE ATT&CKSocial engineeringInfrastructure deploymentActive DirectoryMobile application securityWireless network securityPentesting CloudAWS Identity and Access Management (IAM)AWS CLIAWSGCPMobile platformsHybrid modelsMicrosoft Entra IDMicrosoft Azure

About

Offensive security enthusiast with an ongoing master's degree in Cybersecurity and Information Security from the University of Castilla-La Mancha. My academic background has provided me with solid knowledge in computer and system security, as well as in ethical hacking and pentesting tools and methodologies. In addition, I have the CEH and CRTO certifications. Currently, I work as Ethical Hacker - Red Team Operator at EY, where I actively participate in various technical projects, especially in the areas of penetration testing and Red Team exercises for national and international clients, mainly in the banking sector. Among my achievements, I highlight having contributed to increase the resilience of clients against sophisticated threats, through the design and execution of Red Team scenarios based on the MITRE ATT&CK matrix, the deployment of the necessary infrastructure, the use of social engineering techniques, the bypass of security measures (AV, EDR) and the realization of MITRE ATT&CK TTPs. I have also performed both internal and external penetration testing, on infrastructures based on Active Directory environments, web applications, iOS devices and wireless networks. I am thrilled to continue developing my knowledge in cybersecurity.

Experience

5 yrs 4 mos

Total Experience

4 yrs 5 mos

Average Tenure

11 mos

Current Experience

Accenture

Senior Security Analyst - Red Team Operator

Jun 2025 – Present · 11 mos

Ey

3 roles

Senior Ethical Hacker - Red Team Operator

Jun 2024 – Jun 2025 · 1 yr

Ethical Hacker - Red Team Operator

Promoted

Jan 2022 – Jun 2025 · 3 yrs 5 mos

Within the offensive security team of the company, I have actively contributed to a variety of technical projects, particularly in the areas of penetration testing and Red Team engagements. My responsibilities encompassed:
Red Team engagements:
Deploy the necessary infrastracture to perform Red Team exercises.
Plan a series of Red Team scenarios focused on the MITRE ATT&CK matrix, thereby enhancing the
client's resilience to sophisticated threats.
Design social engineering attacks.
Bypass of security measures (AV,EDR)
Perform MITRE ATT&CK TTP's
Penetration testing engagements:
Pentest on internal infrastracture networks based on Active Directory environment.
External infrastracture pentest (SMTP, Exposed Services...).
Audit of web applications based on OWASP
Mobile applications pentest
Wireless network audits
Pentest of ATM's
These experiences have equipped me with a robust skill set in executing advanced technical assessments and devising strategic initiatives to enhance cybersecurity posture.