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Senior Network Security Engineer
< Hybrid_3x >
JOB REF NO:
JOBX-11999FF6
Job Description:
We are looking for a Senior Network Security Engineer with experience in enterprise environments and critical incident management, to ensure the operation, evolution, and security of network infrastructures in a hybrid setup in Lisbon.
Responsibilities:
Manage and resolve critical network security incidents (P1/P2), including root cause analysis;
Ensure service mitigation and recovery, participating in major incidents / war rooms;
Coordinate with SOC, NOC, vendors, and client teams;
Plan and execute complex changes, including migrations and new implementations;
Assess risks and define rollback strategies;
Validate configurations before and after changes;
Administer and optimize security solutions (NGFW, VPN, ZTNA, Anti-DDoS, EDR/XDR);
Perform upgrades, hardening, and policy optimization;
Monitor performance, capacity, and availability;
Identify opportunities for technical and operational improvements;
Implement and evolve network security architectures;
Maintain technical documentation;
Act as technical owner for assigned environments;
Support internal teams in solution design;
Diagnose and resolve complex issues in distributed environments.
Requirements:
Bachelor’s degree in Computer Science, Information Technology, or related field;
Minimum of 5 years of experience in network security;
Experience in enterprise or Managed Services environments;
Proven experience handling critical incidents in 24x7 environments;
Strong knowledge of security technologies (Firewalls, VPN, ZTNA, Anti-DDoS, EDR/XDR);
Solid understanding of routing, switching, and network architecture;
Experience with SD-WAN, SASE/SSE, Load Balancers, and secure access technologies (2FA);
Strong troubleshooting skills in complex environments;
Ability to design, implement, and assess security solutions;
High level of technical autonomy and experience in multi-client environments;
Strong analytical thinking and decision-making skills;
Good communication and teamwork skills;
Ability to work under pressure;
Proactive mindset with focus on continuous improvement.
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