Deputy CISO - Lisbon Based

1GLOBAL is a technology-driven global mobile communications leader, built to help enterprises unlock the full potential of mobile connectivity at scale. Powered by a best-in-class telecom platform – including our own owned and operated global mobile core network, a full end-to-end eSIM technology stack, and an extensive portfolio of telecom licenses – 1GLOBAL operates as a fully regulated telecommunications provider across 40 countries worldwide. Combined with our privileged access to the global wholesale telecom market, this positions us uniquely to deliver seamless, compliant, and scalable connectivity solutions anywhere in the world.

We serve many of the world’s leading banks, enterprises, and digital-first businesses, including neo-banks, 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 exceeding US$200 million and profits of over US$25 million, we generate strong cash flows and fund our growth independently—continuously investing 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 telecommunications offerings.

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.

Position Overview

The Deputy CISO will play a critical leadership role within the Global Cybersecurity Organization, acting as the operational right hand to the Group CISO. This position drives the day-to-day execution of the security strategy across a worldwide telecommunications footprint, ensuring the resilience, integrity, and security of all network, IT, and cloud environments.

This is a hands-on leadership role ideal for someone deeply experienced with cybersecurity architectures, operational security, and enterprise-scale security solutions.

This position will be based in Lisbon, Portugal.

Key Responsibilities

Operational Leadership

• Leverage the 1Global Security Operations Team (CyberDefense), including SOC, Threat Detection & Response, Incident Response, Vulnerability Management, and Security Engineering.
• Own daily operational security performance, ensuring 24/7 protection across a distributed, high-availability telco environment.
• Translate the CISO’s strategic objectives into executable operational plans and measurable KPIs.
• Oversee the CyberTrust team activity focused on compliance and security awareness.

Security Architecture & Solutions

• Oversee the design, deployment, and lifecycle management of critical security technologies (e.g., SIEM, SOAR, EDR/XDR, IAM/PAM, network security, cloud security platforms).
• Evaluate and integrate new security solutions, with strong focus on scalability, automation, and alignment with telco-grade performance requirements.
• Ensure technical standards, reference architectures, and hardening guidelines are maintained and adopted globally.

Risk & Compliance

• Ensure operational compliance with international standards and regulations (e.g., ISO 27001, NIS2, GDPR, telecom regulatory frameworks).
• Lead technical risk identification, quantification, and mitigation activities across infrastructure, applications, and services.
• Oversee security audits, penetration tests, and red-team scenarios, ensuring findings are remediated promptly.

Incident Response & Crisis Management

• Serve as the technical lead during major security incidents, coordinating cross-functional teams, external partners, and executive communication.
• Maintain and continuously improve global incident response playbooks and readiness programs.

Cross-Functional Collaboration

• Act as the bridge between strategic security leadership and operational teams across all regions.
• Work closely with Network Engineering, Cloud, IT, Product, and Managed Services teams to embed security into designs and operations.
• Engage with external partners, MSSPs, vendors, and regulatory agencies as required.
• Work closely with 1Global Group CTO and Platforms Director to ensure strategic alignment and secure implementations.

Requirements:
Must-Have

• 10+ years in cybersecurity, with at least 5 years in operational leadership roles (e.g., SecOps, Cyber Defense, Security Architecture).
• Strong background implementing and managing enterprise security technologies and large-scale security platforms in complex environments.
• Proven experience in global telecommunications or other highly distributed, high-availability infrastructures.
• Deep understanding of telco-specific security areas such as network core protection, signaling security (SS7/Diameter), mobile network security (4G/5G), OSS/BSS security, and cloud-native telecom environments.

Nice-to-Have

• Experience with global regulatory environments and cross-border operations.
• Certifications such as CISSP, CISM, CCSP, GCIH, or similar.
• Experience leading hybrid internal/MSSP SOC models.
• Familiarity with Zero Trust, Secure-by-Design, and automation-centric security approaches.

Personal Attributes

• Highly operational mindset with strong execution discipline.
• Exceptional communication skills, able to translate technical issues into business impact.
• Calm under pressure and effective in crisis situations.
• Collaborative, pragmatic, and able to influence diverse global teams.
• Curious and unsettle.

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.