Linux/Unix Security Administrator


We are seeking a skilled and motivated Linux/Unix Security Administrator to join our team. The ideal candidate will be responsible for ensuring the security and stability of our Linux/Unix servers. This role involves regularly applying patches, addressing vulnerabilities, and collaborating with our SOC Team to maintain a secure environment. The Linux/Unix Security Administrator will play a vital role in safeguarding our systems, analyzing potential threats, and implementing effective solutions.

If you are passionate about ensuring the security and stability of Linux/Unix systems, and if you thrive in a dynamic and fast-paced environment, we encourage you to apply and become a key part of our dedicated security team.

Location: Varna (hybrid with home office).

Employment Type: Full-time


  • Apply security patches, hotfixes, and configuration changes to Linux/Unix servers to maintain up-to-date and secure systems.
  • Collaborate with the SOC Team to review and address vulnerabilities identified through various security tools.
  • Monitor vulnerability bulletins and assess their impact on systems, taking necessary steps to mitigate risks.
  • Work with the SIEM to analyze logs, read data, and configure new alarms to detect and respond to security incidents.
  • Utilize knowledge of Load Balancers (LB) and WAF to enhance server performance and security.
  • Regularly review security policies and procedures, identifying areas for improvement and implementing best practices.
  • Troubleshoot and resolve security-related incidents promptly and effectively.
  • Collaborate with cross-functional teams to ensure seamless integration of security measures across the organization.
  • Stay updated on the latest security trends, vulnerabilities, and industry standards.


  • Bachelor’s or Master’s degree in Computer Science, Information Security, or a related field (or equivalent experience).
  • Proven experience as a Linux/Unix Administrator with a focus on security.
  • Strong understanding of Linux/Unix operating systems, including command-line interfaces and system configurations.
  • Experience with security patch management and vulnerability remediation.
  • Familiarity with security monitoring tools.
  • Knowledge of security protocols and best practices.
  • Ability to work in a team, take initiative, and prioritize tasks effectively.
  • Strong problem-solving and analytical skills.
  • Excellent communication and collaboration skills.

LIREX offers:

  • Professional Growth: Career development opportunities, work with highly performing team members, meaningful projects, tech innovations
  • Upskilling: Various trainings, knowledge sharing events, online and in-person learning opportunities to grow
  • Work-life balance: Well-adjusted work-life-balance due to flexible working hours and home office regulations
  • Additional Insurance: Attractive health and dental insurance packages
  • Extra Days Off: The longer you work with us, the more paid leave you get

We look forward to welcoming a talented Linux/Unix Security Administrator to our Team to help maintain a secure and resilient infrastructure.