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Chief Information Security Officer – CISO (H/F)

Horizon Trading Solutions
Paris (75)

Postuler rapidement

Détails de l'emploi

Qualifications

Tests d'intrusion
Anglais
Java
Docker
Securité
Linux
Cyber-sécurité
Sécurité des réseaux

Description complète du poste

Horizon Trading Solutions is an independent global technology company focused on electronic trading, supporting agency and principal business activities across equities and derivatives.

For over 20 years, we have equipped leading capital market participants with algorithmic trading technology and direct connectivity to more than 80 exchanges worldwide.

We are currently looking for a Chief Information Security Officer to strengthen our cybersecurity posture and lead the execution of our key security initiatives.

This newly created role combines security strategy with hands-on execution. You will assess our existing environment, define clear priorities and work closely with our technical teams to ensure that security improvements are effectively implemented.

Your Key Responsibilities

Identity, Access & Infrastructure Security

Assess and strengthen identity and access management across the organisation.
Improve MFA, SSO, RBAC, privileged-access management and access-review processes.
Strengthen the security of our Microsoft environment, particularly Microsoft Entra ID.
Review the security of internal networks, endpoints, servers and cloud or on-premise environments.
Identify security weaknesses and work with technical owners to implement remediation actions.

Cybersecurity Strategy & Roadmap

Assess Horizon's current cybersecurity posture and main areas of exposure.
Define and maintain a pragmatic, risk-based cybersecurity roadmap.
Translate identified risks into prioritised actions, owners and deadlines.
Drive security initiatives and ensure that agreed improvements are effectively delivered.
Track and communicate key risks, remediation progress and security priorities.

Vulnerability Management, Monitoring & Incident Response

Establish proactive monitoring of vulnerabilities and emerging threats.
Coordinate penetration tests and manage remediation plans through to closure.
Improve security monitoring capabilities, including SIEM, EDR, logging and alerting.
Define and test incident-response procedures.
Support the investigation and coordination of cybersecurity incidents.

Cyber Resilience

Review disaster-recovery, backup and business-continuity capabilities.
Define and test recovery procedures for critical systems.
Organise cyber-crisis simulations with technical and business stakeholders.
Identify and address resilience gaps affecting business-critical services.

Security Advisory & Stakeholder Support

Provide practical security guidance to IT, Engineering, Product and Support teams.
Support client security reviews, audits and technical due-diligence processes.
Present key cybersecurity risks and priorities to senior management.
Promote pragmatic security practices aligned with operational and business constraints.

Profile

What we are looking for

At least five years of hands-on experience in cybersecurity.
Strong experience in identity, access, infrastructure and network security.
Good knowledge of Microsoft security environments, particularly Microsoft Entra ID.
Experience with vulnerability management, penetration testing, monitoring and incident response.
Ability to define a pragmatic security roadmap and drive remediation actions through to completion.
Autonomous, pragmatic and action-oriented mindset.
Professional fluency in English.
Experience with application security, DevSecOps, business-critical SaaS, financial software or electronic trading environments would be a plus.

Technical Environment

Microsoft Entra ID and Microsoft end-user environment
Cloud, on-premise and hybrid infrastructure
Networks, firewalls, endpoints and servers
SIEM, EDR, centralised logging and monitoring tools
Java-based electronic trading platform
Linux, Docker and CI/CD environments
Real-time and business-critical systems

Why Join Us ?

Take ownership of cybersecurity within an international fintech.
Combine security strategy with concrete and visible execution.
Work on business-critical electronic trading technology.
Collaborate closely with experienced technical teams and senior management.
Contribute directly to Horizon's next stage of cybersecurity maturity.
Join an international and human-sized organisation where your work can make a real difference.

Horizon is an equal opportunity employer. We promote diversity, multiculturalism, and inclusion.

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