Christan Calvarido

Successful in meeting new technical challenges and finding solutions to meet the networking needs of clients. Experienced across pre-sales consultation, implementation/deployment, and post-sales support. End-to-end technical expertise spanning the client network and application layer through to the last-mile access device and the Service Provider's core infrastructure.

Strong knowledge and extensive hands-on experience with multivendor Routers and Switches. Skilled in configuring and designing RIP, OSPF, EIGRP, and BGP networks. Experienced in configuring and troubleshooting Cisco ASA firewalls.

Expert in deploying and configuring WAN protocols including Serial PPP, MLPPP, ATM, Frame Relay, MLFR, and Ethernet networks.

Network Analyst at Visa Worldwide Pte Ltd. (2017-04 – 2026-09)

• Monitored and managed global network infrastructure, ensuring high availability and reliable connectivity for Visa services and clients.
• Performed real-time incident detection, troubleshooting, escalation, and resolution for network, cloud, and connectivity-related issues.
• Investigated client-impacting incidents involving Azure cloud services, network routing, load balancers, private connectivity services, and security infrastructure.
• Conducted root cause analysis of single-client and multi-client outages across shared network environments and cloud platforms.
• Utilized enterprise monitoring and diagnostic tools including SevOne, SolarWinds, NetBrain, Netcool, and NetScout to proactively identify service disruptions and maintain operational stability.
• Monitored and validated network routing, BGP peering, IPSec tunnels, load balancer health, and cloud infrastructure performance to ensure service continuity.
• Collaborated with Network Engineering, Infrastructure Services, Cloud Engineering, Telecom Providers, and Client Support teams to drive incident resolution and service restoration.
• Managed client communications and stakeholder escalations during critical incidents, minimizing business impact and ensuring timely updates.
• Executed operational runbooks, documented troubleshooting procedures, and supported continuous improvement of monitoring and response processes.

Level II Global Network Engineer at Transcom Worldwide Inc. (2014-07 – 2017-03)

• Provide support for network projects, including design and deployment solutions for the company's global network infrastructure.
• Act as subject matter expert in network infrastructure for new project and campaign planning, design, and deployment.
• Provide Level 2 support from the Service Desk utilizing ServiceNow for ticketing and Change Requests (Standard, Normal, and Emergency).
• Perform day-to-day network monitoring, operations, and troubleshooting of escalated network issues.
• Provide configuration expertise for Cisco devices such as ASA firewalls, switches, and routers.
• Install and maintain network monitoring systems such as Cacti, Nagios, and RANCID.

Tier II Network Implementation Engineer at Accenture — Project: Verizon (2012-05 – 2014-07)

• Activated WAN and LAN connectivity for new site installations.
• Configured MPLS customer edge routers (WAN, LAN, BGP, QoS, EIGRP, OSPF, HSRP).
• Collaborated with Project Managers, Field Engineers, Telecommunication Service Providers, and customers on network activation, implementation, troubleshooting, and testing.
• Implemented and troubleshot LTE connectivity.
• Handled installations, circuit upgrades/downgrades, maintenance work, and change management orders.
• Confirmed out-of-band modem connectivity and validated Layer 3 connectivity.
• Tested devices prior to NOC handoff to ensure compliance with security standards and compatibility with existing customer network devices.

Solutions Specialist at Philippine Long Distance Telephone Inc. (iPlus Intelligent Network Inc.) (2010-06 – 2012-04)

• Responsible for assessment and initial configuration of PLDT-managed routers.
• Planned capacity upgrades to meet growing customer needs.
• Prepared deliverable and feasible network configuration/solution designs for customers' data services.
• Provided technical support to the PLDT SME Sales Group by evaluating corporate customer telecom and data requirements and recommending network solutions based on company products and services.

Project Engineer at Luckywide Enterprises Inc. (2008-08 – 2009-02)

• Performed initial configuration on Cisco routers deployed to KFC stores nationwide.
• Conducted site surveys for network cabling structure on new and existing networks.
• Completed other duties and responsibilities as assigned by the Manager.

Freelance Network Engineer at Self-Employed (2007-07 – 2010-05)

• Installed and configured clients' routers and switches.
• Evaluated clients' ICT requirements in coordination with their respective ISPs.
• Provided additional support including Windows OS and software installation, repair, and maintenance for computer shops.

Bachelor of Science in Electronics and Communications Engineering – Saint Louis University (2001 – 2006)

Cisco Certified Network Associate in Network Engineering – University of the Philippines ITTC (2009 – 2010)