Network Engineer

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.

Network Engineer

Key Skills

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