Senior Network Security Consultant

Clan; Lisboa, Porto; On-site; EUR 90,000 - 120,000; Full time

Job summary

Clan in Lisbon seeks a proactive Senior Network Security Consultant to lead functional initiatives across OSS, Mobile Networks, and Network Security domains. You will act as a trusted advisor, translating business goals into end-to-end functional specifications and guiding multi-vendor programs.

The role emphasizes client relationships, program coordination, risk assessments, and strategic roadmaps for telecom transformation, with travel as needed and strong Portuguese + English communication.

Qualifications

• Bachelor's or Master's degree in Telecommunications Engineering, Electrical/Electronics Engineering, Computer Science, Information Technology, or a closely related field.
• At least 4 years of professional experience in the telecommunications industry, with a focus on functional architecture, network security design, program coordination, or team leadership.
• Native or fluent proficiency in Portuguese alongside full professional fluency in English (mandatory for daily client interactions).
• Solid End-to-End Telecom Functional Knowledge, including OSS, Mobile Core, RAN, and security architectures.

Responsibilities

• To lead and oversee the functional requirements and day-to-day needs for OSS, Mobile Networks (RAN, Core), and network security domains.
• To act as the primary client-facing advisor, managing daily relationships, setting expectations, and translating business goals into end-to-end functional specifications.
• To participate in and guide large-scale telecom transformation programs, ensuring seamless integration across multi-vendor and multi-domain environments.
• To assess network security posture and functional risks across mobile and fixed networks, aligning design with international standards and operational guidelines.
• To coordinate and prioritize local team activities, deliverables, and backlog management with high autonomy and clear direction.
• To prepare and deliver high-level functional designs, risk evaluations, and strategic project roadmaps for technical and executive stakeholders.
• To bridge the gap between technical execution teams and client leadership to ensure quality and timely delivery.
• Flexibility and willingness to travel internationally on an occasional/sporadic basis according to project demands.

Skills

Client facing

Team leadership

Functional architecture

Project coordination

Network security design

Stakeholder communication

Strategic advisory

Requirement gathering

Education

Bachelor's or Master’s degree in Telecommunications Engineering

Bachelor's or Master’s degree in Electrical/Electronics Engineering

Bachelor's or Master’s degree in Computer Science

Bachelor's or Master’s degree in Information Technology

Tools

VNF/CNF

TM Forum ETOM

Telecom Cloud

Job description

We are seeking a proactive, mature, and client-facing Senior Network Security Consultant to lead functional initiatives and client requirements across OSS, Mobile Networks, and Network Security domains.

Rather than operating solely as a deep-tech hands-on specialist, this role requires an end-to-end (E2E) functional perspective of telecom systems (Radio, Core, OSS, BSS) combined with an advisory posture. You will act as a trusted functional lead and an advisor, managing requirement pipelines, coordinating team deliverables, and guiding network transformation projects.

• To lead and oversee the functional requirements and day-to-day needs for the OSS, Mobile Networks (RAN, Core), and network security domains.
• To act as the primary client-facing advisor, managing daily relationships, setting expectations, and translating business goals into end-to-end functional specifications.
• To participate in and guide large-scale telecom transformation programs, ensuring seamless integration across multi-vendor and multi-domain environments.
• To assess network security posture and functional risks across mobile and fixed networks, aligning design with international standards and operational guidelines.
• To coordinate and prioritize local team activities, deliverables, and backlog management with high autonomy and clear direction.
• To prepare and deliver high-level functional designs, risk evaluations, and strategic project roadmaps for technical and executive stakeholders.
• To bridge the gap between technical execution teams and client leadership to ensure quality and timely delivery.
• Bachelor's or Master's degree in Telecommunications Engineering, Electrical/Electronics Engineering, Computer Science, Information Technology, or a closely related field.
• At least 4 years of professional experience in the telecommunications industry, with a focus on functional architecture, network security design, program coordination, or team leadership.
• To have prior experience in team coordination, project management, or functional area management (desiderable).
• Native or fluent proficiency in Portuguese alongside full professional fluency in English (mandatory for daily client interactions).
• Solid End-to-End Telecom Functional Knowledge, including a broad understanding of Telecom Network ecosystems-specifically OSS (Operations Support Systems), Mobile Core (4G/5G), RAN (Radio Access), and supporting network security architectures.
• Familiarity with virtualized network functions (VNF/CNF), Telco Cloud, or OSS transformation frameworks (e.g., TM Forum/eTOM) (Desiderable).
• Understanding of telecom security frameworks and standards (e.g., 3GPP TS 33.xxx, GSMA, ISO 27001, NIST) (Desiderable).
• Strong client-facing maturity and posture, characterized by excellent interpersonal, communication, and presentation skills, combined with a confident and approachable style in direct client engagements.
• Strategic advisory mindset, with the ability to evaluate full E2E system impacts and business value beyond isolated technical components.
• High level of autonomy and proactive leadership, capable of coordinating team activities and managing local deliverables effectively.
• Flexibility and willingness to travel internationally on an occasional/sporadic basis according to project demands.