Deputy CISO

About Us

1GLOBAL is a technology-driven global mobile communications provider, delivering global connectivity solutions to enterprises and consumers. Powered by a best-in-class telecom platform – including its own owned and operated global mobile core network, fully fledged in-house developed eSIM technology, and an extensive portfolio of telecom licenses – 1GLOBAL operates as a fully regulated telecommunications provider across 40 countries worldwide.

We serve many of the world’s leading banks, enterprises, and digital-first businesses, including neo-banks, global fast moving consumer goods companies, travel leaders, and payment service providers. Today, 1GLOBAL connects more than 70 million people and devices globally, enabling our customers to launch, scale, and innovate with confidence in the mobile ecosystem.

1GLOBAL is a profitable, fast-growing business. With full-year revenues in 2025 exceeding US$200 million and profits of over US$25 million, we generate strong cash flows to fund our growth allowing us to continuously invest in infrastructure, platform innovation, and global expansion. Recent years have marked a defining phase in our journey, with major enterprise and mass-consumer client wins accelerating our evolution into a global mobile connectivity powerhouse, purpose-built to enable consumer brands to enter and succeed with their own aspirations to offer telecommunications services to their clients.

Founded in 2022 by experienced technology entrepreneurs, Hakan Koç and Pyrros Koussios, 1GLOBAL has rapidly emerged as a European technology leader shaping the future of global telecommunications. We operate as a fully regulated Mobile Virtual Network Operator (MVNO) in 12 countries and as a regulated telecom operator in an additional 28 markets. Headquartered in the Netherlands, with world-class R&D hubs in Lisbon, Berlin, and São Paulo, our team of close to 500 experts across 15 countries is united by a single ambition: to redefine global mobile connectivity through technology, scale, and execution excellence.

About the Team

The Deputy CISO runs 1GLOBAL's security function. This is an operational leadership role: you are the day-to-day head of security, reporting directly to the CISO with a dotted line to the CIO.

You will lead the CyberDefense organisation (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 Role

• Lead the CyberDefense and CyberTrust teams. Own daily operational security performance across a distributed, high-availability telecoms environment.

• Serve as Incident Commander for significant security incidents. Maintain and continuously improve global incident response playbooks and readiness programmes.

• 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, reference architectures, and hardening guidelines globally.

• Own telco-specific security domains: network core protection, signalling security (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-team exercises; 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/Diameter signalling, 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.

• GSMA standards familiarity (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. Represents Security credibly at board and regulator level without the CISO in the room. Calm under pressure. Delivers bad news early.

Benefits:
Why 1GLOBAL?

• Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 100% 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.