Network Administrator – On-Premise Infrastructure & Security

Job Summary:
Our company is seeking an experienced Network Administrator to architect, implement, and maintain our/client in-house infrastructure for a public-facing web application. The ideal candidate will be responsible for setting up secure, high-availability networks and server environments within our premises, ensuring robust security, scalability, and consistent uptime, while also adhering to industry-standard best practices.

• Key Responsibilities:
• Infrastructure Setup & Configuration:
  • Design and implement a secure local network infrastructure including firewalls, switches, routers, and load balancers.
  • Set up and maintain physical servers to host web applications, databases, and internal tools.
  • Configure public DNS, NAT, port forwarding, and firewall rules to expose selected services securely to the internet.
  • Setup and Manage web server environments (Apache, Nginx, IIS) and reverse proxies.

• Security Management:
  • Implement and enforce physical and network security measures including perimeter firewalls, endpoint protection, SSL/TLS certificates, WAF, IDS/IPS, MFA and access control.
  • Configure and monitor Intrusion Detection/Prevention Systems (IDS/IPS) and DLP solutions.
  • Manage VPN gateways and secure remote access for internal users.
  • Manage endpoint security, Conduct regular vulnerability assessments, patch management, and security audits.
  • Implement access control policies using IAM (Identity and Access Management).
  • Monitor for and respond to network security breaches or anomalies.

• Monitoring & Maintenance:
  • Implement network and system monitoring tools (e.g., Zabbix, Prometheus, Grafana, CloudWatch)
  • Set up infrastructure monitoring and alerting systems for servers, network devices, and application services.
  • Regularly monitor bandwidth, latency, system logs, disk utilization, and hardware health.
  • Ensure daily and periodic backups, test recovery processes, and maintain DR (Disaster Recovery) protocols.
  • Ensure compliance with security audits, standards (e.g., ISO 27001, SOC 2), and data protection policies.
  • Maintain system performance and plan for capacity upgrades as required

• Operational Support:
  • Provide ongoing technical support for internal users and infrastructure services.
  • Provide 24/7 support for mission-critical infrastructure components.
  • Apply OS and firmware updates, antivirus definitions, and security patches in a timely manner.
  • Create and maintain detailed documentation of infrastructure topology, configurations, and policies.
  • Monitor compliance with internal IT and data protection policies.
  • Analyze and optimize infrastructure for cost-efficiency and performance.

• Required Skills and Experience:
  • 5+ years of experience as a Network/System Administrator managing on-premise infrastructure.
  • Proficiency in configuring and managing firewalls, routers, switches (e.g., Cisco, MikroTik, Fortinet, Ubiquiti).
  • Strong experience with Windows/Linux server administration and network services (DNS, DHCP, FTP, SSH, SMTP).
  • Solid understanding of TCP/IP, subnetting, routing, VLANs, and NAT.
  • Expertise in setting up and managing local server rooms or data centers (power backup, physical security, ventilation, etc.).
  • Experience with tools like Nagios, Zabbix, PRTG, or similar for infrastructure monitoring.

• Preferred Qualifications:
  • Relevant certifications such as CCNA, CCNP, CompTIA Network+/Security+, or Red Hat Certified Engineer (RHCE).•
  • Experience with containerized deployments (Docker, Kubernetes) is a plus.
  • Experience in public IP management and secure remote administration.
  • Understanding of DevSecOps principles.
  • Knowledge of data compliance standards (e.g., ISO 27001, GDPR) is a plus

• What We Offer:
  • Opportunity to own and lead the core infrastructure of a growing tech company.
  • Exposure to enterprise-level network and security practices in a hands-on environment.
  • A collaborative and innovation-driven work culture.