Head of Cyber Security

Company Description NULLSQUARE focuses on proactively eliminating cyber threats before they develop into breaches. The organization combines offensive security testing, hardened architecture, and advanced defensive measures to protect critical systems and data. By emphasizing prevention and resilience, NULLSQUARE helps clients reduce risk and strengthen their overall security posture. Team members work with modern security tools and methodologies aimed at anticipating and neutralizing evolving cyber threats. Role Description The Head of Cyber Security is a contract, remote role responsible for leading the overall security strategy and execution across NULLSQUARE’s services and internal operations. This role oversees the design and implementation of security architectures, coordinates offensive testing activities, and directs vulnerability management initiatives. Day-to-day responsibilities include assessing security risks, reviewing application and network security controls, guiding incident response, and ensuring information security policies and standards are maintained. The Head of Cyber Security will collaborate with technical and leadership teams, provide expert guidance on security best practices, and continuously evaluate and improve next-generation defense capabilities. Qualifications Strong foundation in Cybersecurity and Information Security, with the ability to define and drive organization-wide security programs. Experience in Application Security, including secure development practices, code review, and remediation of application-level vulnerabilities. Proficiency in Vulnerability Management, such as risk assessment, prioritization, and oversight of remediation activities. Expertise in Network Security, including securing network architectures, monitoring, and implementing defensive controls. Proven experience leading security teams or programs, preferably in a consulting or security services environment. Familiarity with offensive security testing methodologies, penetration testing, and red teaming is highly beneficial. Knowledge of common security frameworks and standards (e.g., ISO 27001, NIST, CIS) and relevant regulatory requirements. Excellent communication skills, with the ability to explain complex security concepts to technical and non-technical stakeholders. Bachelor’s degree in Computer Science, Information Security, or a related field, or equivalent practical experience; advanced certifications (e.g., CISSP, OSCP, CISM) are a plus.

The Head of Cyber Security leads the overall security strategy, overseeing the design of security architectures and vulnerability management initiatives. They are responsible for assessing risks, guiding incident response, and improving next-generation defense capabilities across internal and client operations.

Candidates must have a strong foundation in cybersecurity with proven experience leading security teams, specifically in application and network security. A bachelor's degree in a related field is required, and advanced certifications like CISSP or OSCP are highly preferred.

Identified from the job description. Confirm important requirements above.

• Cybersecurity Strategy
• Application Security
• Vulnerability Management
• Network Security
• Offensive Security Testing
• Penetration Testing
• Red Teaming
• Risk Assessment
• Incident Response
• Security Architecture
• ISO 27001
• NIST
• CIS
• Security Governance
• Technical Leadership

• Security & Safety
• Technology
• Management & Leadership
• Consulting
• Software

Minimum education

Professional degree

Minimum experience

10+ years

Apply by

Sep 20, 2026

Posting language

English

Working hours

40 hours per week

Seniority

Director

Application method

Direct apply is available