With 10+ years in network infrastructure and security, I help businesses resolve the issues that stop daily operations: failed VPNs, blocked firewall traffic, unstable branches, cloud connectivity and VoIP/SIP problems.
My focus is simple: find the actual root cause, restore services with minimum disruption, and avoid risky trial-and-error changes on a live network.
I have supported enterprise, government, data centre and multi-site business networks using Fortinet, Cisco and other leading firewall platforms, with hybrid connectivity across AWS, Microsoft Azure and Google Cloud.
My "Zero-Risk" Methodology
Many engineers rely on "guess and check" troubleshooting. I don't. I never make blind changes on a live production network. Before altering your setup, I map your current design, analyze your routing, and review firewall policies. I always pull backups, engineer a rollback plan, and execute controlled, fully documented changes. My goal is permanent stability, not temporary patches.
Core Expertise & Outcomes Delivered:
Firewall & Threat Management: FortiGate, Cisco, UniFi, and MikroTik. (Comprehensive policy audits, legacy rule cleanup, and strict hardening).
Complex VPN Troubleshooting: Site-to-Site, Remote-Access, IPsec, and SSL VPNs. If your tunnel is unstable or failing, I will stabilize it.
Cloud & Hybrid Infrastructure: AWS (VPC, Security Groups), Microsoft Azure (VNet, VPN Gateway, NSG), and Google Cloud. I build secure, seamless office-to-cloud and cloud-to-cloud bridges.
VoIP/SIP Optimization: Resolving SIP registration failures, NAT traversal bugs, one-way audio, and call drops using precise QoS, Voice VLANs, and Cisco CUBE support.
Advanced Routing & Switching: SD-WAN deployments, dual-ISP failover, VLANs, and comprehensive LAN/WAN/Wi-Fi troubleshooting.
How We Can Partner:
Emergency Troubleshooting: Rapid isolation and resolution of critical connectivity, routing, or security failures affecting your users.
Network Health & Security Audits: Deep-dive reviews to identify vulnerabilities, clean up messy configurations, and provide actionable security roadmaps.
Infrastructure Setups & Migrations: End-to-end planning for new branch offices, secure remote work environments, and physical security networks (CCTV/Biometrics).
Retained Network Support: Dependable, on-demand escalation support for internal IT teams, MSPs, software companies, and business owners.
My core technical experience includes:
• FortiGate configuration, migration and troubleshooting
• Cisco routers, switches, Firewall, Firepower, Voice Gateway and CUBE
• Fortigate, Fortinet, Mikrotik,
• IPsec, SSL and remote-access VPNs
• Site-to-site VPN and multi-site connectivity
• SD-WAN, dual-ISP failover and policy-based routing
• VLANs, routing, NAT, DHCP, DNS and LAN/WAN troubleshooting
• Firewall policy review, cleanup and security hardening
• Wi-Fi, office connectivity and branch network support
• AWS VPC, routing, security groups, VPN and hybrid access
• Azure VNet, NSG, VPN Gateway, peering and hybrid connectivity
• Google Cloud VPC, firewall rules, VPN and network access
• SIP, NAT traversal, RTP, one-way audio and call-drop issues
• Voice VLANs, QoS and firewall policies for voice traffic
• Network diagrams, documentation and handover notes
Where access permits, I take a backup, confirm the rollback plan, make controlled changes, test the traffic flow and document the result. This is especially important on production firewalls, remote branches, VPN tunnels and voice networks, where one quick change can affect another service.
Let’s Secure Your Network
Whether you need a one-time emergency fix, a comprehensive security audit, or ongoing support, I am here to help.
Please share:
Your primary firewall/hardware vendor and model.
The exact issue or project scope (and any recent changes made).
The number of sites or users affected.
Once I understand your exact setup and the business impact, I will provide a clear, safe plan of action to get your network running flawlessly.
Network Security
Firewall
Fortinet
Cisco
VPN
Amazon Web Services
Microsoft Azure
Google Cloud Platform
Cisco ASA
Cisco Firepower Threat Defense
Routing
LAN Administration
WAN Optimization
Wireless Network Implementation
Cloud Security
Security Testing
Network Architecture
Network Administration
Information Security Audit
Troubleshooting
Ken O.
Quezon City, Philippines
$35/hr
5.0
4 jobs
I’m a network engineer with over 9 years of experience in managing, optimizing, and securing complex network infrastructures in global environments.
Professional Background:
I offer end-to-end network solutions—from setup to optimization—designed to give your business uninterrupted performance, top-tier security, and long-term stability.
Specializations:
1. Cisco Technologies (Routers, Switches, Firewalls - ASA, ISE, SD-WAN, VPN - AnyConnect)
2. Juniper (Routers and Switches)
3. Arista (Routers and Switches)
4. Meraki (Switches and Access Points)
5. Palo Alto Firewalls
6. Fortigate Firewalls
7. Linux Servers
8. VMWare vCenter
Certifications:
1. CCNP Enterprise
2. CCNA Security and Data Center
3. AWS Cloud Practitioner
If you’re looking for a reliable professional to manage your network, resolve technical challenges, and strengthen your infrastructure's security and efficiency, let’s connect.
Network Administration
Network Engineering
Network Traffic Analysis
Network Monitoring
Palo Alto Firewalls
FortiGate Firewall
Cisco ASA
Cisco ISE
Cisco Certified Network Professional
Cisco Meraki
Juniper
Closed-Circuit Television
Nate F.
Fort Myers, Florida
$90/hr
4.9
50 jobs
Senior Network Engineer, over 10 years experience in IT networks.
Telecom, routing, switching, wireless, VOIP, VPN, firewalls, cabling, LAN/WAN. video surveillance, Cisco, Meraki, Ubiquiti, Netgear, SonicWall, HP and more.
Cisco Routers, ISR 1900,2900.3900, 4300,4400,
Voice Gateways, VG224, VG310, VG320,VG350, VG450.
Voice, CSU/DSU, PRI, SIP. PSTN, POTS, analog lines.
Cisco Wireless LAN Controllers ( WLC ) 9800, 5760, 5520, 5508, 4402, 2504.
Access Points indoor,outdoor, CAPWAP, LWAPP, autonomous, mobility express, mesh and repeaters.
IP Phones
VOIP IP Phones
Telecom
Firewall
ASA
Network Security
AnyConnect
Cisco Unified Communications
Call Manager, CUCM
Collaboration
Cisco Unity Connection, CUC
CME
Cisco Unity Express, CUE
Power over Ethernet , POE , Network cabling
Cisco Catalyst switches, 2960X, 9200, 9300, 3650, 3850,3750, 4506, 4510, 4500X
Meraki Switches ,firewalls, Access Points and Cameras.
Structured Cabling
Network Security
VPN
Firewall
Cisco Certified Network Associate
Network Engineering
Cisco Meraki
Network Design
Network Administration
Wireless Communication
Virtual LAN
Network Video Recorder
Cisco Certified Network Professional
VoIP Administration
Wireless Network Implementation
Yun P.
Littleton, Colorado
$55/hr
4.6
8 jobs
I am a CCIE-certified Network Engineer with over 14 years of experience designing, upgrading, and supporting on premise and hybrid enterprise network infrastructure across healthcare, financial services, professional services, public sector, and managed services environments.
My background is rooted in deep hands-on expertise across routing and switching, data center networking, WAN architecture, and advanced troubleshooting in complex, multi-vendor environments. I have worked extensively with platforms including Cisco, Palo Alto, Infoblox, Arista, and Juniper.
Throughout my career, I have led large-scale remote and hybrid deployments, stabilized critical network environments, and improved uptime, performance, and scalability across both data centers and distributed enterprise systems. I bring a strong ability to partner cross-functionally with infrastructure, security, and operations teams to deliver resilient, high-performing network solutions.
CORE COMPETENCIES:
★ Data Center Architecture
★ Routing & Switching
★ SD-WAN
★ Network Security
★ WAN Architecture
★ Infrastructure Modernization
★ Advanced Troubleshooting
★ Cisco Nexus & Catalyst
★ Palo Alto / Fortinet Firewalls
★ Infoblox
★ BGP / OSPF / EIGRP
★ MPLS / DIA
★ Network Automation (Ansible)
★ High Availability & Resiliency
★ Leaf & Spine / Core & Distribution & Access
TOOLS:
Cisco IOS | Cisco NX-OS | Cisco Nexus (9000/7000/5000/2000) | Cisco Catalyst | Cisco ACI | Arista EOS | Juniper MX/EX | ArubaOS | Nokia OS | Cisco Meraki | BGP | OSPF | EIGRP | vPC | STP | VDC | VXLAN | EVPN | NAT | QoS | Multicast | VRF | DMVPN | IPsec | HSRP | VRRP | GLBP | LACP | LLDP | CDP | Cisco Catalyst SD-WAN | Viptela SD-WAN | SilverPeak SD-WAN | MPLS | DIA | Metro Ethernet | Palo Alto | Fortinet | Cisco ASA | Cisco ISE | Cisco DNA | Wireshark | Ansible | TCL Shell | Python | SecureCRT | PuTTY | ServiceNow | Microsoft Teams | Zoom | Webex | Outlook | Visio
CERTIFICATIONS:
CCIE Routing & Switching #51201 | CCNP | CCDA | MCSE
Network Design
Network Architecture
Network Engineering
Network Planning
Network Security
Network Monitoring
Network Equipment
Network Traffic Analysis
Wide Area Network
Local Area Network
Wireless Network Implementation
Cisco Certified Internetwork Expert
Cisco ACI
Cisco Meraki
Cisco WLC
Cisco ISE
Network Administration
Palo Alto Firewalls
Cisco Certified Network Professional
Cisco Router
Oriel B.
Naic, Philippines
$40/hr
5.0
6 jobs
I am a Licensed Electrical Engineer with hands-on experience in mission-critical data center environments, currently working with Equinix Philippines as a Senior IBX Customer Operations Engineer.
I specialize in electrical power systems, data center infrastructure, and technical engineering support. My background includes working with high-availability systems such as UPS, generators, switchgear, ATS/MTS, and structured cabling within Tier III data center environments.
I bring real-world operational experience into every project—not just theoretical design—ensuring that all outputs are practical, reliable, and aligned with industry standards.
Here are the services I offer:
• Professional Consultation
• Electrical load calculations and panel schedules
• Single-line diagram (SLD) creation and review
• Data center and server room power planning (kW/kVA, rack capacity)
• UPS, generator, and ATS system support and consultation
• Electrical technical reports and documentation
• AutoCAD electrical layouts and as-built diagrams
I am familiar with industry standards such as TIA-942 and data center best practices, and I focus on delivering accurate, well-documented, and professional outputs.
If you are looking for a reliable Electrical Engineer who understands real-world systems and mission-critical environments, I would be glad to support your project.
Electrical Engineering
Electrical Design
Power System
Load Calculation
Autodesk AutoCAD
Data Center Operations
Data Center
Data Center Design
Energy Management
Engineering Tutoring
ETAP
Tom W.
Walnut, California
$20/hr
5.0
3 jobs
I am a Senior Network Engineer with 16 years of experience in resolving complex technical issues and enhancing network performance. My expertise lies in troubleshooting and collaborating across teams to address customer challenges effectively. I have a proven track record of implementing successful readiness programs, developing technical documentation, and mentoring new support engineers. My hands-on experience with top companies has equipped me with the skills to foster collaboration and drive innovation in network solutions. If you're seeking a professional who can not only solve problems but also strengthen your team’s technical capabilities, let's discuss how I can contribute to your project's success.
Cisco CallManager
Cisco Unity Connection
Cisco Certified Network Associate
Cisco Certified Entry Networking Technician
Cisco
Computer Network
Computing & Networking
Network Engineering
System Administration
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