Network Engineer

2 weeks ago

Bucharest, Bucureşti, Romania Data Edge Full time

Contract Details: Freelance(6 months with high probability of further extension)
Hybrid work
: 2 days from home, 3 days from the clients office from Bucharest.

Seniority:
Mid-Senior Level

Language:
Excellent English (spoken & written)

Role Overview
We are seeking a skilled
Network Security Engineer
to manage, maintain, and enhance our network security infrastructure. The ideal candidate will have solid hands-on experience with Cisco Firewalls (ASA & Firepower), strong networking fundamentals, and the ability to support a complex enterprise network. This role is critical in ensuring security, stability, and performance across all network layers.

Key Responsibilities
Firewall & Security Management

  • Manage Cisco ASA and Firepower firewalls, ensuring compliance with security policies and operational standards.
  • Operate and maintain IDEMIA firewalls, centrally managed by the Network Security team.
  • Create, modify, and remove filtering rules based on ticket requests, ensuring appropriate validation from Security and Compliance.
  • Administer firewalls through FMC (Firepower Management Center), handling configuration updates, security hardening, and optimizations.
  • Apply system configurations and enforce security hardening for new firewalls.

Network Operations

  • Configure and manage routers, switches, firewalls, and load balancers to support stable network performance.
  • Monitor network activity, detect anomalies, investigate incidents, and troubleshoot issues proactively.
  • Oversee network performance using tools such as Wireshark, SolarWinds, Cisco IOS/NX-OS.
  • Ensure robust and secure operations through best practices in TCP/IP, VLANs, VPNs, BGP, OSPF, and overall network security.

Collaboration & Support

  • Work closely with system engineers, project managers, and external vendors to integrate network components into larger infrastructure projects.
  • Provide guidance and support to IT teams submitting firewall rule requests.
  • Participate in infrastructure upgrades, migrations, and new deployments.

What You Bring
Education & Experience

  • Bachelors degree in Computer Science, Software Engineering, or a related field (preferred).
  • 3-5 years of hands-on experience in a similar networking/security role.
  • Strong foundational knowledge of networking principles and enterprise-grade infrastructure.
  • Experience managing complex network environments, ideally in infrastructure-heavy or construction-related industries.

Technical Skills

  • Mandatory: Practical experience managing Cisco ASA Firewalls (configuration, troubleshooting, policy management).
  • Hands-on experience with Cisco Firepower, FMC, and firewall administration.

  • Expertise in:

  • TCP/IP

  • VLANs
  • VPNs
  • BGP, OSPF

  • Network security best practices

  • Proficiency with troubleshooting & monitoring tools:

  • Wireshark, SolarWinds, Cisco IOS/NX-OS

  • Knowledge of cloud networking (AWS, Azure, GCP) and SD-WAN technologies is a strong plus.

Certifications (Highly Desirable)

  • CCNA
  • CCNP
  • Or equivalent networking/security certifications.

Soft Skills

  • Strong problem-solving and analytical capabilities.
  • Proactive mindset and ability to anticipate and resolve network issues.
  • Excellent communication skills for interactions with both technical and non-technical stakeholders.

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