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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.

I am a professional developer of programs for PLC and SCADA with eight years of experience. SCADA Systems: WinCC, Citect. PLC Programming (PLC):Siemens (Step7, TIA Portal), Schneider-Electric (Unity Pro, Somachine, EcoStruxure™ Machine Expert), Rockwell (RSLogix500, RSLogix5000), Mitsubishi (GX Works), Omron ( Sysmac Studio, CX-One), Moeller (Codesys) etc. Operator panels: Schneider-Electric, Rockwell, Siemens, Eaton, etc. Communication protocols: PROFIBUS, MODBUS, Ethernet, Profinet, CANOpen. Databases: SQL Server. Work with frequency converters, soft starters, sensors of different types.

Over 13 years of experience in Enterprise network solutions, design, implementation & Operations. List of solutions experience: A) Routing & Switching: Cisco ISR, ASR(IOS/IOS-XE), Nexus N5K, N7K, C2960, C3650, Catalyst 9K, SG500X, Brocade/Ruckus, HP Mellanox SN2000, QoS, BGP, OSPF, EIGRP, STP, VLAN, VPC B) Networks Security: Cisco FirePower, ASA/FTD, Juniper ISG, Fortigate 501E 201E, FortiAnalyzer/FortiManager, PaloAlto PA-5200, Cisco ISE (Tacacs+ / Radius), SecureWorks, SonicWall, pfsense, Meraki MX, Cisco Umbrella, DUO 2FAC C) Wireless Networks: Cisco WLC 9800 | Cisco 9100 series AP , FlexConnect / Mobility Express, Meraki MR D) Remote Access | VPN: CiscoAnyConnect, Prisma, Zscaler E) Network Performance Optimization: Riverbed Steelhead F) Monitoring: Solarwinds, Nagios, Netscout G) Cloud computing - AWS H) IT service mgmt. | IT vendor mgmt. | IT service delivery mgmt. | Project mgmt. Continuously pushing to leverage technology, and identify better methods to enhance customer experience, and deliver on time with highest quality.

Hi there! I am a Senior Network & Linux Systems Administrator with experience in designing, configuring, and maintaining network infrastructures ranging from home office setups to full-scale ISP environments. Whether you need to configure an enterprise core switch, set up an ISP-grade OLT/router, secure your remote access via VPN, or maintain high-availability Linux servers, I deliver reliable, clean, and well-documented solutions. Hardware & Vendor Knowledge: Enterprise & ISP-Grade: Juniper (Junos), ZTE, MikroTik (RouterOS). SOHO & Small Business: Ubiquiti, TP-Link, Cisco SMB, and generic routers. Network Engineering & Infrastructure: Advanced VLAN segmentation (802.1Q, Q-in-Q) for secure, organized traffic routing. Routing protocols (OSPF, BGP, Static Routing) and IP addressing schemes (IPv4 / IPv6). ISP equipment configuration (OLT/ONU provisioning, GPON setup, bandwidth shaping). Linux Server Administration: Distribution support: Ubuntu Server, Debian, CentOS, AlmaLinux, Rocky Linux. Web, database, and service hosting maintenance with focus on security and uptime. Network Services & Security: VPN Solutions: OpenVPN, WireGuard, IPsec, L2TP. Media Services: IPTV streams, multicast setup, IGMP proxy/snooping. Essential Services: DNS, DHCP, NAT, Firewalls (iptables, nftables, RouterOS Firewall), Monitoring (Zabbix, SNMP, Cacti).

System Administration: I have extensive experience working with Linux/Unix systems, including CentOS, Debian, Ubuntu, AlpineLinux, FreeBSD, as well as Windows Server. I have configured and maintained servers from various manufacturers such as HPE, DELL, IBM, Supermicro. Familiar with various hosting control panels: DirectAdmin, cPanel, Plesk, VestaCP/HestiaCP, CWP. Integration and Automation: I have deep knowledge of protocols on hosting servers: HTTP(S), DNS, FTP, SFTP, SSH, SMTP, IMAP. Developed and implemented integrations for optimizing and automating server infrastructure processes. Virtualization and Cloud Technologies: Significant experience with virtualization, including KVM (Proxmox, Libvirt), VirtualBox, OpenVZ, LXC, VMWare. Configured and managed virtual environments, aiming for maximum flexibility and efficiency. Networking Solutions: Proficient in maintaining networks on equipment from Juniper, Cisco, Mikrotik. Confidently configured VLANs and BGP, as well as controlled the operation of the network firewall to ensure security and stability. Telephony: I have experience working with SIP telephony systems, such as Asterisk, for setting up and supporting VoIP communication, ensuring reliability and quality of communication. Worked with FreePBX, including developing various integrations through its API. Programming and Scripting: Proficient in programming with PHP and JavaScript, successfully developed various modules and integrations for the WHMCS billing system. Familiar with Python and its use for task automation and script development to enhance work efficiency.

I have experience in: DevOps: Jenkins, Ansible, Docker, web servers(nginx, apache, iis), gitlab Monitoring Systems: Zabbix, Grafana, telegraf Databases: postgres, mysql, firebird, mssql System administration: FreeBsd, Linux, Windows Server 2003/2008/2012/2016/2019 (Active Directory), and etc. Develop integrations in healthcare(mirth connect, rest API and etc.)