Deputy CISO - Operational Delivery

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 with its own owned and operated global mobile core network in 15 countries, fully fledged in-house developed eSIM technology, and an extensive portfolio of telecom licenses; 1GLOBAL operates as a fully regulated telecommunications provider across 43 countries worldwide. The company serves many of the world’s leading banks, multinational enterprises, global retailers and digital-first businesses, including neo-banks, global fast moving consumer goods companies, travel leaders, and payment service providers. Today, 1GLOBAL connects more than 80 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. In 2026 also the parent of the Lidl Group acquired a 10% interest in 1GLOBAL as part of a deal for Lidl to offer globally to its 180 million consumers communication services.

Recent years have marked a defining phase in 1GLOBAL’s journey, with major enterprise and mass-consumer client wins accelerating its 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. It operates as a fully regulated Mobile Virtual Network Operator (MVNO) in 15 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, its team of close to 550 experts across 16 countries is united by a single ambition: to redefine global mobile connectivity through technology, scale, and execution excellence.

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, reporting directly to the CISO with a dotted line to the CIO. You will lead the Cyber Defense 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 Responsibilities

• Lead the Cyber Defense team.
• 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.