Hire the Best LAN Administrators in Kyiv, UA

PROFILE GENERAL Experienced Network Engineer | Cybersecurity Specialist | IT Infrastructure Expert 🔹 Vade in expertis🔹 🔹Citius, altius, fortius 🔹 What I Do Best: * Network Engineering: Advanced routing, switching & optimization using Cisco, Meraki, Ruijie, Extreme Networks, Aruba, Juniper, HPE, Dell, Mikrotik, ZTE. * Cybersecurity: Fortigate, Palo Alto Networks, VPN (IPSec/SSL), MFA, SSO, Cortex XDR, DPI control, NAT, SSH management, threat prevention. * Cloud & Virtualization: AWS, Azure, Google Cloud, VMware, Proxmox, OpenPallet, clustering, backups, disaster recovery. * Protocols & Services: BGP, OSPF, MPLS, SIP gateways, VoIP/PBX, AD, load balancing, production & factory network integration. * Infrastructure Design: Data centers, IDF/MDF layouts, server rooms, telecommunications, industrial machine connectivity. Why Clients Choose Me: ✅ 10+ years in enterprise networking, cloud, and cybersecurity. ✅ Expert with multi-vendor environments (Cisco, Fortigate, Palo Alto, Aruba, Juniper, HPE, Dell, VMware, Mikrotik & more). ✅ Proven success in manufacturing, energy, media, and service sectors. ✅ Clear, friendly communication without the jargon. I Can Help You With: Configuring *switches, firewalls, routers, wireless, servers, clusters, hosts**. * Designing and implementing secure, high-performance IT infrastructures. * Troubleshooting complex issues (IPSec tunnels, SSL sessions, SIP gateways, DPI, NAT). * Modernizing outdated networks for speed, stability, and compliance. * Coordinating with vendors for seamless integrations. Industries Served: Manufacturing | Energy | Media | Distribution | Industrial | Technology | SaaS 💬 Let’s connect — whether you need a secure new setup, a performance boost, or 24/7 reliability, I’ll deliver results you can count on. SOFT SKILLS and ABILITY Responsible for the consequences. My actions admitted. Honest at all time. Result orientation. Great communication and very polite. I'll be happy to assist with: Configuring - Swithces/Firewalls/Routers/Wirless/Servers, Host, Node, Claster of Servers, Virtualization, Backup, Production and Factoring Design and Implementation - Switching, Telecommunications, IDF/MDF, Server-room, Cybersecurity, VPN, AS LIR, VoIP/PBX, Comminication. Troublsooting and Moderniztion IPSEC Tunnel, SSL Session, DPI Control, SIP Gateway, Tech Consult, Service Support, Industrial Machines, Media, Customer Support, Distribution maintannace, Energy, AWS, Google Cloud, Microsoft Azure, AD, NAT, SSH Management. Work with vendors - Cisco, Meraki, Ruiji, Extreme Network, Aruba, Juniper, HPE, DELL, PALO ALTO NETWORKS, FORTIGATE, VMware, Proxmox, OpenPallet, Mikrotik, CentOS, Ubuntu, Debian

Networking: VPN: PPTP, L2TP, L2TP+IpSec, OpenVPN; IPv4/IPv6,TCP/IP, Lag/lacp, VLAN, NAT, DHCP, DNS, L2/L3, Firewall. Mikrotik, Juniper EX,QFX,SRX, Aruba, Dell, Unifi, Cisco, Fortigate. Windows: Hyper-V, WDS, File server, Radius, AD, GPO, DNS, DHCP Linux: Supporting Zimbra, OTRS, FreePBX, OpenVPN, Pfsens, FreeRadius (LDAP+AD)

Linux/Unix Systems, Internet Protocol Suite (TCP/IP), OSI, Virtualization systems(VM Ware/Vsphere/Vbox). A high level of knowledge in building a VPN(IPSEC/SSL VPN/GRE), configuring routing(OSPF/BGP), and creating a fault-tolerant network that can remain operational in case of problems. Experience in configuring and maintaining equipment: Juniper, Cisco, Fortinet, MikroTik, D-link, Teltonika. Monitoring and administrating monitoring system (Nagios, Grafana, Kibana, Cacti, Nagvis, Zabbix) Worked in systems for global network management, backup systems. and log analyzers (Cisco Ise/Cisco Prime/Fortimanager/Fortianalizer/Syslog4all/QRADAR). Elaboration of the architecture of network solutions, and the creation of fault-tolerant nodes in the network infrastructure.

- 12+ years operating enterprise infrastructure, network, cloud, and security systems. - Strong production ownership mindset: reliability, monitoring, documentation, secure access, and incident response. - Designed infrastructure supporting 3000+ IoT devices across distributed locations. - Managed virtualization environments with 100+ virtual machines across Proxmox / VMware / Hyper-V-style platforms. - Built monitoring with Zabbix / Prometheus / Grafana / PRTG, improving visibility across 1000+ nodes and reducing incident response time. - Strong firewall, VPN, segmentation, DNS, routing, and secure connectivity background. - Hands-on with Azure networking, OCI, hybrid cloud, Active Directory, Windows Server, Linux, Docker, and reverse proxies. - Security-focused operator with experience in audits, hardening, access control, disaster recovery, and Fortinet security technologies. - Comfortable with evidence-based change control, production readiness checks, and saying “not ready” when required evidence is missing. - Strong written documentation and knowledge-base development experience.

With over a decade of experience in System Engineering and Architecture, I have honed my skills in various facets of IT infrastructure management and optimization. Throughout my career, I have played a pivotal role in numerous migration projects, which encompass designing from the ground up, enhancing existing systems, and providing support for diverse infrastructures. My expertise spans across the following domains: • Management, development, and implementation of on-premises Microsoft products and services, including Windows Server, DNS, DHCP, Active Directory, Group Policy, Remote Desktop Services, System Center, Hyper-V, SQL Server, and Clustering, among others. • Administration of Open-Source products and services such as Ubuntu, CentOS, MySQL, Nginx, Apache, WordPress, Let's Encrypt, PHP, Docker, pfSense, and more. • Comprehensive knowledge of Azure/Office 365 IaaS, SaaS, and PaaS offerings, including Site Recovery, Azure Migrate, Active Directory, Multi-Factor Authentication, Azure Information Protection, Intune, Enterprise Mobility + Security, Virtual Machines, Databases, etc. • Proficiency in Amazon Web Services IaaS, SaaS, and PaaS solutions, including S3, EC2, CloudFormation, RDS, CloudWatch, Migration Service, and VPC, among others. • Experience with Dell, HP, Supermicro, Cisco, and Lenovo servers and storage systems. • Network management for Dell, HP, Cisco, Mikrotik, Ubiquiti, D-Link, and TP-Link devices. • Implementation and support of Microsoft, VMware, Nutanix, and Starwind hyper-converged infrastructures. • Expertise in Exchange, Kerio Connect, and Zimbra mail systems. As a seasoned professional, I am committed to delivering top-notch services in a diverse range of projects and ensuring optimal performance of IT infrastructures.

I'm developing PC and mobile games for about 20 years in various companies. Switched from network/system administrator profile in 2004. * Occassionally working on non-gamedev projects too. * Worked with many common game engines - Unity, Unreal, GoDot. * With Unity I have the most deep and fresh knowledge. * Also very interested in learning Unreal more deeper, and other engines, systems, SDKs as well. * Experience in supporting and updating legacy mobile games with in-house C++ game engines. * I'm new here at Upwork but have a solid background working in companies, usually at least 2 years in each. * I'm thorough to details, diligent and always open to communication and discussing questions openly.