Deputy CISO - Operational Delivery

1global; Lisboa; On-site; EUR 140,000 - 190,000; Full time

Benefits offered by this job

Growth opportunities

International experience

Dynamic work environment

Professional development

Job summary

1GLOBAL is seeking a Deputy CISO to lead the security function across a multi‑jurisdictional telecom environment. You will be the day‑to‑day head of security, reporting to the CISO with a dotted line to the CIO, and will own the Cyber Defense organization including SOC, threat detection, incident response, and security engineering.

Responsibilities include incident command for major security events, risk management, and ensuring GSMA, GDPR, and other regulatory standards are embedded in product

Qualifications

• 10+ years in cybersecurity with 5+ years in operational leadership.
• Proven incident commander in production telecom or distributed infrastructure.
• Deep familiarity with telco security domains and security platforms.

Responsibilities

• Lead the Cyber Defense team across SOC, Threat Detection, and Incident Response.
• Act as Incident Commander for major security incidents.
• Oversee design, deployment, and lifecycle management of security technologies: SIEM, SOAR, EDR/XDR, IAM/PAM.
• Own telco security domains: network core, signalling (SS7/Diameter), 4G/5G, OSS/BSS.
• Maintain security risk register and oversee penetration tests and red-teaming.
• Oversee Security Engineering and ensure security is embedded in designs across teams.
• Approve operational security platform changes and represent Security in change processes.

Skills

Cybersecurity leadership

Incident response

Threat detection

Security engineering

GSMA standards

Regulatory compliance

Zero Trust

Board communication

MSSP partnerships

Tools

SIEM

SOAR

EDR/XDR

IAM/PAM

Job description

1GLOBAL is a technology-driven global mobile communications provider helping enterprises and consumer brands deliver seamless connectivity worldwide. Powered by a best-in-class telecom platform, proprietary eSIM technology, and its own mobile core network across 15 countries, 1GLOBAL operates as a fully regulated telecommunications provider in 43 countries.

Founded in 2022, 1GLOBAL has rapidly become one of Europe's fastest-growing telecom technology companies, connecting more than 80 million people and devices globally. Our customers include leading banks, multinational enterprises, global retailers, travel companies, payment service providers, and digital-first businesses.

Headquartered in the Netherlands, with R&D hubs in Lisbon, Berlin, and São Paulo, 1GLOBAL employs over 550 professionals across 16 countries. With annual revenues exceeding US$200 million and a strong track record of profitability, we continue to invest in innovation, infrastructure, and international expansion as we redefine the future of global mobile connectivity.

About the Role

The Deputy CISO runs 1GLOBAL's security function. This is an operational leadership role: you are the day-to-day head of security, reportingdirectlyto the CISOwith a dotted line to the CIO. You will lead theCyber Defenseorganisation(SOC, Threat Detection and Response, Incident Response, Vulnerability Management, Security Engineering). You will command incidents, own compliance execution across a multi-jurisdictional regulatory environment, and hold the Engineering-Security relationship together. The CISO owns governance and board accountability. You own delivery.

About the Responsibilities

• Lead theCyber Defenseteam. Own daily operational security performance across a distributed, high-availabilitytelecomsenvironment.
• Serve as Incident Commander for significant security incidents. Maintain and continuously improve global incident response playbooks and readinessprogrammes.
• Oversee the design, deployment, and lifecycle management of critical security technologies: SIEM, SOAR, EDR/XDR, IAM/PAM, network security, and cloud security platforms. Maintain technical standards, referencearchitectures, and hardening guidelines globally.
• Own telco-specific security domains: network core protection,signallingsecurity (SS7/Diameter), mobile network security (4G/5G), OSS/BSS security, and cloud-native telecom environments.
• Own the security risk register day-to-day. Lead technical risk identification, quantification, and mitigation. Oversee penetration tests and red-teamexercises;ensure findings are remediated promptly.
• Oversee Security Engineering: architecture review process, SDLC security, GSMA SGP compliance in product delivery. Ensure security is embedded in designs across Network Engineering, Cloud, IT, and Product.
• Approve operational security platform changes. Represent Security in the Engineering change process.

About Us

1GLOBAL is a technology-driven global mobile communications provider helping enterprises and consumer brands deliver seamless connectivity worldwide. Powered by a best-in-class telecom platform, proprietary eSIM technology, and its own mobile core network across 15 countries, 1GLOBAL operates as a fully regulated telecommunications provider in 43 countries.

Founded in 2022, 1GLOBAL has rapidly become one of Europe's fastest-growing telecom technology companies, connecting more than 80 million people and devices globally. Our customers include leading banks, multinational enterprises, global retailers, travel companies, payment service providers, and digital-first businesses.

Headquartered in the Netherlands, with R&D hubs in Lisbon, Berlin, and São Paulo, 1GLOBAL employs over 550 professionals across 16 countries. With annual revenues exceeding US$200 million and a strong track record of profitability, we continue to invest in innovation, infrastructure, and international expansion as we redefine the future of global mobile connectivity.

About the Role

The Deputy CISO runs 1GLOBAL's security function. This is an operational leadership role: you are the day-to-day head of security, reportingdirectlyto the CISOwith a dotted line to the CIO. You will lead theCyber Defenseorganisation(SOC, Threat Detection and Response, Incident Response, Vulnerability Management, Security Engineering). You will command incidents, own compliance execution across a multi-jurisdictional regulatory environment, and hold the Engineering-Security relationship together. The CISO owns governance and board accountability. You own delivery.

About the Responsibilities

• Lead theCyber Defenseteam. Own daily operational security performance across a distributed, high-availabilitytelecomsenvironment.
• Serve as Incident Commander for significant security incidents. Maintain and continuously improve global incident response playbooks and readinessprogrammes.
• Oversee the design, deployment, and lifecycle management of critical security technologies: SIEM, SOAR, EDR/XDR, IAM/PAM, network security, and cloud security platforms. Maintain technical standards, referencearchitectures, and hardening guidelines globally.
• Own telco-specific security domains: network core protection,signallingsecurity (SS7/Diameter), mobile network security (4G/5G), OSS/BSS security, and cloud-native telecom environments.
• Own the security risk register day-to-day. Lead technical risk identification, quantification, and mitigation. Oversee penetration tests and red-teamexercises;ensure findings are remediated promptly.
• Oversee Security Engineering: architecture review process, SDLC security, GSMA SGP compliance in product delivery. Ensure security is embedded in designs across Network Engineering, Cloud, IT, and Product.
• Approve operational security platform changes. Represent Security in the Engineering change process.

Requirements

About You

• 10+ years in cybersecurity; 5+ years in operational leadership (SecOps, Cyber Defense, Security Architecture).
• Proven incident commander in a production environment, ideally in global telecoms or other distributed, high-availability infrastructure.
• Deep familiarity with telco-specific security: network core protection, SS7/Diametersignalling, 4G/5G mobile network security, OSS/BSS, and cloud-native telecom environments.
• Strong background implementing and managing enterprise security platforms at scale: SIEM, SOAR, EDR/XDR, IAM/PAM.
• Direct operational experience with at least two of: GSMA SAS-SM, NIS2, GDPR, MiFID II, DORA. Audit evidence, notifications, certification cycles.
• Experience leading hybrid internal/MSSP SOC models including MDR partner relationships.
• Familiarity with Zero Trust, Secure-by-Design, and automation-centric security approaches.
• GSMAstandardsfamiliarity (SGP.22, SGP.32, FS.18) is a strong advantage. Certifications such as CISSP, CISM, CCSP, or GCIH are a plus.
• Builds trust with Engineering.RepresentsSecurity credibly at board and regulator level without the CISO in the room. Calmunderpressure. Deliversbad newsearly.

Benefits

• Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 50% year-on-year under the leadership of successful tech entrepreneurs
• Major Transaction Exposure: Be in the driver's seat for transactions that will have an impact on the future telco industry
• Work with a Talented Team: From the Board and the Founders to the Senior Management Team, you will collaborate daily with the most capable and renowned external advisors and constantly being exposed to talented and driven individuals
• Dynamic Work Environment: Thrive in a collaborative, fast-paced workplace where innovation is encouraged, and every contribution counts
• Professional Development: Work alongside industry experts to enhance your skills and knowledge in a cutting-edge field
• International Experience: Gain opportunities to work in different 1GLOBAL offices around the world as you grow within the company
• Open Communication Culture: Join a team where your ideas are heard, and open dialogue is encouraged, fostering a supportive and transparent work environment
• Get Things Done Attitude: Be part of a results-driven team that values efficiency, creativity, and the drive to make a tangible impact in the industry

1GLOBAL is an equal opportunity employer, we value your character as much as your talent. Diversity drives our innovation, and we offer a collaborative, dynamic, and international work environment. We are excited for you to join our mission to revolutionise connectivity globally.