Penetration Tester

Lostar

İstanbul, , Turkey Remote permanent

Posted: January 13, 2026

Job Description

Since 1998, Lostar is the leading Information Security firm, with more than 1000 projects in Turkey and abroad. Its main services are; Information Security Checkups such as Internet-Intranet Penetration Tests, Gap Analysis of world-wide best practices like COBIT, ISO 27001, ISO 22301 and ISO 20000, related consultancy and data protection projects and also Employee Security Awareness Methodology trainings.

Lostar consultants, who are well trained and experienced, create the optimal-cost solutions for their customers with paying attention to technical and commercial needs. Lostar has 3 offices in 3 different cities such as Istanbul, London and Sakarya.

For latest news and updates please follow us on:

• Linkedin: Lostar
• Instagram: LostarInfoSec
• Twitter (TR): Lostar
• Twitter (EN): Lostar_EN
• YouTube: LostarTV
• Facebook: Lostar
• Facebook (Jobs): LostarKariyer
• and visit our web sites:
• English: https://lostar.com
• Turkish: https://lostar.com.tr

As a Penetration Tester at Lostar, you will lead comprehensive security assessments, including web applications, internal networks, and Active Directory. Engage in Red Team simulations and vulnerability scanning to protect our clients' digital assets. This role offers primarily remote work with occasional on-site visits, providing flexibility and a collaborative work environment.

• Experience: Minimum 2 years in penetration testing.
• Skills: Proficiency in internal testing, exploit development, and Red Team tactics.
• Education: Higher education degree required.
• Certifications: OSCP, OSEP, GPEN preferred.
• Be a good team player.

• Responsibilities: Conduct vulnerability scans, identify risks, participate in Red Team activities, and adapt to ad hoc tasks.
• Benefits: Health insurance, career development programs, and flexible working hours.

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