1 GLOBAL is a technology‐driven global mobile communications provider dedicated to empowering enterprises worldwide to unlock the full growth potential of mobile connectivity. With a best‐in‐class telecom technology platform, a comprehensive suite of globally viable regulatory licenses, and privileged access to the telecom wholesale market, 1 GLOBAL is uniquely positioned to deliver seamless compliance and connectivity solutions. Serving the world's leading banks, corporations, and digital‐first businesses—including neo‐banks, travel companies, and payment service providers—1 GLOBAL connects over 43 million devices globally. With 2024 full‐year revenue exceeding US$100 million and on track to surpass US$200 million in FY25, the company is profitable and reinvesting in infrastructure, transformation, and growth.Position OverviewThe Deputy CISO will play a critical leadership role within the Global Cybersecurity Organization, acting as the operational right hand to the Group CISO. The role 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.Key ResponsibilitiesOperational LeadershipLeverage the 1 Global Security Operations Team (Cyber Defense), including SOC, Threat Detection & Response, Incident Response, Vulnerability Management, and Security EngineeringOwn daily operational security performance, ensuring 24/7 protection across a distributed, high‐availability telco environmentTranslate the CISO's strategic objectives into executable operational plans and measurable KPIsOversee the Cyber Trust team activity focused on compliance and security awarenessSecurity Architecture & SolutionsOversee the design, deployment, and lifecycle management of critical security technologies (SIEM, SOAR, EDR/XDR, IAM/PAM, network security, cloud security platforms)Evaluate and integrate new security solutions, emphasizing scalability, automation, and alignment with telco‐grade performance requirementsEnsure technical standards, reference architectures, and hardening guidelines are maintained and adopted globallyEnsure operational compliance with international standards and regulations (ISO 27001, NIS2, GDPR, telecom regulatory frameworks)Lead technical risk identification, quantification, and mitigation activities across infrastructure, applications, and servicesOversee security audits, penetration tests, and red‐team scenarios, ensuring findings are remediated promptlyIncident Response & Crisis ManagementServe as the technical lead during major security incidents, coordinating cross‐functional teams, external partners, and executive communicationMaintain and continuously improve global incident response playbooks and readiness programsCross‐Functional CollaborationAct as the bridge between strategic security leadership and operational teams across all regionsWork closely with Network Engineering, Cloud, IT, Product, and Managed Services teams to embed security into designs and operationsEngage with external partners, MSSPs, vendors, and regulatory agencies as requiredWork closely with 1 Global Group CTO and Platforms Director to ensure strategic alignment and secure implementationsRequirementsMust‐Have10+ years in cybersecurity, with at least 5 years in operational leadership roles (Sec Ops, Cyber Defense, Security Architecture)Strong background implementing and managing enterprise security technologies and large‐scale security platforms in complex environmentsProven experience in global telecommunications or other highly distributed, high‐availability infrastructuresDeep understanding of telco‐specific security areas such as network core protection, signaling security (SS7/Diameter), mobile network security (4 G/5 G), OSS/BSS security, and cloud‐native telecom environmentsNice‐to‐HaveExperience with global regulatory environments and cross‐border operationsCertifications such as CISSP, CISM, CCSP, GCIH, or similarExperience leading hybrid internal/MSSP SOC modelsFamiliarity with Zero Trust, Secure‐by‐Design, and automation‐centric security approachesPersonal AttributesHighly operational mindset with strong execution disciplineExcellent communication skills, able to translate technical issues into business impactCalm under pressure and effective in crisis situationsCollaborative, pragmatic, and able to influence diverse global teamsCurious and restless in learning new challengesBenefits – Why 1 GLOBAL?Growth Opportunities:Advance your career in a fast‐growing telecommunications companyMajor Transaction Exposure:Play a key role in shaping the future telco industryWork with a Talented Team:Collaborate with senior leaders and external advisorsDynamic Work Environment:Thrive in an innovative, fast‐paced organizationProfessional Development:Enhance your skills alongside industry expertsInternational Experience:Opportunities to work in different 1 GLOBAL offices worldwideOpen Communication Culture:Your ideas are heard and encouragedGet Things Done Attitude:Drive results and create tangible impact1 GLOBAL is an equal opportunity employer. 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.Seniority levelExecutiveEmployment typeFull‐timeJob functionInformation TechnologyIndustriesNon‐profit Organizations and Primary and Secondary EducationReferrals increase your chances of interviewing at 1 GLOBAL by 2x.Get notified about new Chief Information Security Officer jobs inLisboa, Lisbon, Portugal.