Network Security Engineer

Arηs is a fully independent group of companies specialized in managing complex IT projects and systems for large organisations, focusing on state-of-the-art software development, digital trust, cloud, data science, mobile development, machine learning and infrastructure services.

We are composed of 16 entities across 8 countries worldwide that are unified by the Arηs Group, with more than 2500 consultants. This corporate structure enables us to respond quickly to market changes and customer requests, and to communicate and make decisions without layers of bureaucracy.

Established in 2016, the Greek entity Arηs Developments Hellas aims to extend Arηs Group activities dedicated to the European market providing high-quality services in Software Development, covering the entire application development lifecycle.

Key Responsibilities

• Administer and maintain network and security devices (Firewalls, IPS, switches, etc.)
• Administer cryptographic devices ensuring secure communication across systems
• Perform onsite network reconfigurations and infrastructure updates
• Monitor and troubleshoot IP communications services for optimal performance
• Draft and update technical network documentation and operational procedures
• Provide 2nd-line support for IP communication services
• Collaborate with stakeholders to define and document user and technical requirements
• Guide junior staff, providing technical leadership and mentorship
• Occasional travelling is mandatory

Mandatory Requirements

• CONFIDENTIEL UE / EU CONFIDENTIAL security clearance
• Bachelor or Vocational Qualification plus minimum of 4 years of professional experience in network security
• 4 years of hands-on experience with network security technologies (Firewalls, IPS, VPN)
• 1 year of direct participation in wide area network (WAN) operations
• 3 years of hands-on experience configuring Cisco firewalls and switches
• Demonstrated experience with DMVPN deployment and operation
• Good understanding of TCP/IP network protocols
• Certification equivalent to Cisco Certified Network Associate (CCNA)
• Proven ability to work independently and guide junior staff
• Strong technical documentation skills (specifications, concept docs, user guides)
• Effective communication with technical and non-technical stakeholders
• Service-oriented attitude
• Language proficiency: minimum B2/C1 level
• Excellent interpersonal skills
• Ability to work under pressure and manage multiple tasks
• Strong initiative and ownership of assigned responsibilities
• High attention to detail and accuracy

Desirable Requirements

• Hands-on experience in Linux systems administration
• Knowledge of routing and switching technologies
• Knowledge of IP security and VPN solutions
• Good understanding of cryptographic technologies and certificate-based authentication
• Familiarity with voice and video traffic transmission and Quality of Service (QoS) in IP networks