10+ years handling large Enterprise Networks. Expert in Juniper, Fortigate, Cisco, Arista, Palo Alto, and more.

I’m a Senior System and Network Engineer with over 18 years of hands-on experience in IT infrastructure, cybersecurity, and cloud environments. As the founder of AOVD Systems, I help businesses and professionals around the world design, secure, and optimize their digital environments — from local servers to global cloud platforms. ⸻ 🔧 What I Do I deliver end-to-end IT solutions that are secure, scalable, and cost-efficient. My core areas of expertise include: • 🖥️ System Administration & Virtualization – Microsoft Server, VMware, Hyper-V, ESXi • ☁️ Cloud & Microsoft 365 Migration – Azure AD, Exchange Online, Intune • 🔐 VPN Configuration & Network Security – IPSec, SSL VPN, SAML, Multi-factor Authentication • 🧱 Firewall & Endpoint Protection – Fortigate, SonicWall, Cisco, Huntress, FieldEffect, Defender for Business • 💾 Backup & Disaster Recovery – Veeam, Nable, Acronis, Anxient • 📈 Network Performance & Monitoring – PRTG, Nagios, ManageEngine, NetFlow Analyzer • 🔄 Managed IT Services & Remote Support – 24/7 monitoring, patch management, SLA-based response ⸻ 🌍 Who I Work With I’ve supported clients across Europe and the U.S., including: • Government and public institutions • Small and medium businesses seeking reliable IT outsourcing • Professional poker players and private clients requiring secure, anonymous, and latency-optimized VPN setups • Teams transitioning from local servers to the cloud or hybrid infrastructure I combine enterprise-level knowledge with a hands-on, personal approach — ensuring speed, security, and discretion at every step. ⸻ 🎯 Why Clients Choose Me • Proven track record of resolving complex infrastructure issues under pressure • Certified expertise across multiple vendor ecosystems (Microsoft, Cisco, VMware, Veeam) • Transparent communication and detailed technical reporting • Tailored solutions — I don’t copy-paste templates, I solve your specific problem “Vladimir fixed in one hour what others couldn’t in three days.” “Professional, responsive, and precise. My systems are finally stable.” ⸻ 🎓 Certifications & Training • Microsoft Certified Solutions Expert (MCSE) – Server Infrastructure • Cisco Certified Network Professional (CCNP) – Routing & Switching • VMware Certified Professional (VCP) – Data Center Virtualization • Veeam Certified Engineer (VMCE) – Backup & Replication • Microsoft 365 & Azure Administrator Associate • Nagios & PRTG Advanced Monitoring Implementation • ManageEngine Suite Training – Endpoint Central & NetFlow Continuous learning is part of my work ethic — I stay updated with the latest in cybersecurity, automation, and cloud technologies to deliver cutting-edge solutions to every client. ⸻ 🚀 Let’s Work Together Whether you need a VPN configuration, network performance audit, or complete IT infrastructure management, I’ll help you build systems that are secure, stable, and future-ready. 📩 Let’s connect — tell me about your IT challenge, and I’ll design a fast, professional, and cost-effective solution.

I have been in network engineering and operations since 2014. Experienced in Network Engineering which corresponds to implementation, troubleshooting, optimization, integration and managing various network infrastructure, not limited to IP backbone network of the largest Service Provider in the Philippines (Smart Communications, INC.), enterprise networks, Cisco hosted collaboration solutions, and one of the largest BPO companies globally. * Adaptable to new technologies. * In depth network troubleshooting skills. * Able to work under pressure and with minimum supervision. * Has a great attitude towards work. Knowledge and Skills: * EIGRP, OSPF, BGP, MPLS, L3VPN, VRF, HSRP, Cisco SD-WAN, Cisco NGFW firewall, Palo Alto Firewall, Juniper switches, and Arista Routers/Switches/Wireless devices. * Ability to comprehend and create complex network maps and drawings in standard design tools (i.e. Visio or draw.io) License/Certifications: * Registered Electronics and Communications Engineer (Dec. 2013) with license no.: 0056129 * Cisco Certified Network Professional (CCNP) routing and switching: CSCO12602605 * Cisco Certified Design Professional (CCDP): CSCO12602605

Expert Network & Security Support | Cisco | Huawei | H3C | Fortinet | VPN Solutions I provide Level 2 network support for Cisco, Huawei, H3C, and multi-vendor network infrastructures, ensuring high availability, security, and scalability for enterprise and telecom networks. My expertise includes network troubleshooting, security configurations, VPN solutions, and disaster recovery planning to optimize and secure your network. Services I Offer: ✅ Network Support & Troubleshooting: Diagnosing and resolving routing issues (OSPF, BGP, IS-IS), VLAN misconfigurations, and network latency problems. Troubleshooting low power values, CRC errors, faulty hardware (power modules, fans), and link redundancy failures. Performing network health checks, root cause analysis (RCA), and proactive issue resolution. ✅ Network Design & Implementation: Designing scalable network topologies using MS Visio, E-Draw, and E-Draw Max. New node integration and service migration between network nodes. Planning and implementing link redundancy and disaster recovery strategies. ✅ Security & Firewall Configurations: Configuration and management of Palo Alto, Fortinet, pfSense, Cisco ASA, and Huawei Eudemon firewalls. Setting up firewall rules, IDS/IPS policies, NAT, ACLs, and Zero Trust security models. VPN Solutions: Implementing IPSec VPNs, SSL VPNs, and remote access VPNs for secure data transmission. ✅ Network Maintenance & Upgrades: Installing and upgrading firmware, patches, and licenses on routers, switches, and firewalls. Supporting wireless service migrations and configuring Wi-Fi security policies. Managing QoS policies, traffic shaping, and bandwidth optimization. I am committed to providing high-quality, secure, and optimized network solutions tailored to your business needs. 📩 Let’s discuss your project and keep your network running seamlessly! 🚀

Hello, I am a senior network engineer with 20+ years of overall experience in Network Engineering. I got myself certified in respective domains as well through CCIE(R&S) & ACMP, ACSP(Aruba Certifications). I have held positions in Enterprise, System Integrator and Service Provider environments and gained extensive hands on experience in Network designing, implementation, troubleshooting and optimization in the domains of Routing & Switching, Wireless, Network Security and Unified Communication. I strongly believe that my knowledge, experience and technical know-how in the field will equip me to exceed your expectations if the opportunity avails to me.

With over 6 years of hands-on experience, I design, deploy, and manage enterprise-grade network, security, and cloud infrastructures across multi-vendor environments. My work spans diverse industries — including hospitality, pharmaceuticals, SMEs, and large-scale data centers — delivering solutions that are secure, scalable, and built for long-term resilience. **Networking & Infrastructure** I build and manage end-to-end network environments using Cisco, Huawei, Aruba, MikroTik, and more — covering switching, routing, WLAN controllers, and server infrastructure. My deployments range from hotel and resort networks to enterprise data centers, always engineered for high availability and performance. **Cybersecurity & Firewall Engineering** I have deployed 100+ FortiGate firewalls in high-availability configurations, implementing Hub-and-Spoke VPNs, dual-ISP SD-WAN, and SLA-based traffic optimization across enterprise environments. I manage Cisco Firepower Threat Defense (FTD) NGFWs via FMC across tiered networks, and have hands-on deployment experience with Sophos, OPNsense, WatchGuard, OpenVPN, and WireGuard for both site-to-site and remote access connectivity. My security practice extends to Cloudflare Application Security, Cloudflare SASE, FortiSASE, Zscaler, and CrowdStrike EDR/NDR/XDR, with all engagements guided by NIST and HIPAA frameworks. **SD-WAN & VPN** Delivered SD-WAN implementations featuring Hub & Spoke topologies, dual-ISP failover, and SLA-driven traffic steering. Extensive experience with SSL VPN, IPsec, OpenVPN, WireGuard, and multi-vendor VPN client configuration across complex enterprise networks. **Virtualization** Experienced in virtual environment management including VM deployment, migration, and cloning via vSphere Client across enterprise server infrastructure. Certifications HCIP Datacom – Advanced Routing & Switching CCNP Security Fortinet NSE 4 & NSE 5 Open to collaborating with organizations looking to design, secure, and optimize their network infrastructure. Let's build something resilient.

⭐️ Top Rated Plus - Top 3% Expert on Upwork 🕒 9000+ Working Hours ✅ 20+ Years of Expertise ✅ 100% Job Success ✅ 300+ Successful Projects Finished ✅ 5 Star Rating Hello, I'm Oleksandr. As a seasoned Linux System Administrator and DevOps Engineer with over 20 years of experience I specialize in delivering robust IT solutions that enhance operational efficiency and security. My expertise spans across various domains, including: ▪ DevOps & Automation: Successfully implemented automated provisioning using Ansible, streamlining deployment processes and reducing manual intervention. ▪ Linux & FreeBSD Maintenance: Managed and optimized server environments on CentOS, Debian, Ubuntu, RHEL, and FreeBSD, ensuring high availability and performance. ▪ Cloud Hosting: Deployed and maintained scalable cloud solutions on AWS, Azure, and DigitalOcean, enhancing infrastructure reliability and scalability. ▪ Virtualization: Utilized Docker, VirtualBox, and OpenVZ to create flexible and efficient virtual environments, supporting diverse application needs. ▪ Web & Database Servers: Configured and maintained Apache, Nginx, MySQL, PostgreSQL, and MongoDB servers, ensuring secure and efficient data handling. ▪ Networking & Security: Implemented secure networking solutions, including VPNs and firewalls, to protect sensitive data and maintain network integrity. I am committed to continuous improvement and staying abreast of the latest industry trends. My approach is rooted in ITIL best practices, ensuring incident management and business continuity planning are at the forefront of my work. Let's collaborate to drive your IT projects to success with innovative solutions and expert guidance.

Experienced network engineer that has embraced the cloud and helped organizations large and small. I have done everything from establish VPNs to design global hybrid networks that utilize SD-WAN and direct connect. I have also designed multi-account AWS environments with least privilege cross account access via IAM users and SAML identity providers. I hold over 10 AWS certifications including Solutions Architect Professional, Advanced Networking Specialty, and Security Specialty. I am passionate about learning new things, expanding my existing knowledge, and sharing my knowledge to help others effectively utilize technology.

When critical networks fail, businesses lose productivity, revenue, and customer trust. I help organizations design, secure, and optimize enterprise network infrastructure that remains reliable and scalable. With 10+ years of experience, I’ve worked with ISPs, enterprises, and growing companies on complex network environments involving Cisco, Fortinet, Palo Alto, and datacenter technologies. Experience supporting large-scale enterprise and ISP networks across finance, telecom, and managed services environments. I specialize in: ✔ Enterprise & ISP network troubleshooting ✔ Cisco routing & switching ✔ Fortinet and Palo Alto firewalls ✔ VPN deployment and troubleshooting ✔ BGP, OSPF, MPLS, VXLAN, VLANs ✔ Datacenter and core network infrastructure ✔ Network security hardening ✔ Remote support and incident resolution Technologies & Platforms: Cisco Nexus 3K/9K, Catalyst 9300/9500, ASR9K, ISR FortiGate, Palo Alto, Cisco ASA/Firepower MPLS L3VPN, L2VPN, QinQ Cisco ISE, TACACS+, FreeRADIUS WAN, LAN, WLAN, QoS, ACLs, VRF Site-to-Site VPN & SSL VPN What clients can expect: ✅ Fast troubleshooting and problem resolution ✅ Clear communication and documentation ✅ Reliable and secure network designs ✅ Professional support for production environments ✅ Experience with critical enterprise infrastructures Certifications: 🎓 Cisco CCNP Enterprise 🎓 Fortinet NSE 7 If you need help with network deployment, firewall configuration, VPN issues, routing problems, or infrastructure optimization, feel free to contact me.

I'm a Network Engineer with over 6 years of dedicated experience in Networking, complemented by an additional 6 years in IT support and systems administration. My proficiency extends across a spectrum of technologies, including expertise in Cisco, Mikrotik, Meraki, and various other brands.