John Vavrinak
Youngstown
Summary
Strategic Senior Network Engineer specializing in Cisco SD-WAN, Palo Alto, MPLS implementation, and firewall management. Enhance network architecture and optimize performance through troubleshooting and collaboration. Manage complex projects while ensuring compliance with best practices and delivering high-quality customer service.
Overview
22
22
years of professional experience
1
1
Certification
Work History
Senior Network Engineer
Diebold
01.2014 - Current
- Extensive experience with Cisco SD-WAN ISR 1100, VManage, Palo Alto Network 3260's, MPLS, ASA 5555 5540, 5506, 5510 firewalls
- Executed circuit turn-up procedures and conducted thorough testing, ensuring reliable network functionality.
- I handled design, implementation and support using best practice for various F5 modules (LTM, GTM, )
- Analyze existing needs and opportunities for LTM, GTM, to determine current solution needs for updated architecture
- Implement LTM, GTM, configurations with adherence to industry best practices, customer policies
- Work with application teams to fully test solutions
- Documented configuration changes and managed approval processes through change management system.
- Understand current security architecture to determine how F5 modules would work in conjunction with existing security tools
- Work with current load balancer teams to determine automation capability in the F5 architecture
- Collaborated with hosting and application teams to test new interfaces, ensuring readiness for production implementation.
- Experienced with designing, implementing and supporting F5 LTM GTM Architectures
- Ability to prepare documentation with Microsoft Visio and Project
- Working knowledge of routing protocols (TCP, UDP, GRE, IPsec, SIP, etc.)
- Working knowledge of WAN technologies (MPLS, Frame Relay, PTP links).
- Excellent organizational skills to manage multiple network projects and prioritize the tasks
- Strong aptitude for learning new technologies and understanding how to utilize them in a customer's environment
- Effective interpersonal communication and customer service skills; excellent written and verbal communication skills.
Systems Engineer / Network Engineer / Database Engineer
CSC Lackland AFB
01.2011 - 01.2014
- Experienced JDLM Database Manager with 5 years of experience in all phases of JDLM administration, engineering, and development.
- Manages small and large JDLM database supporting a number of military based exercises with responsibility for database design, development and operation.
- Implemented BCS3 configurations and resolved technical issues to enhance system performance.
- Executed and maintained UNIX and Linux systems, Microsoft SQL, and Oracle databases.
- Evaluated client and user requirements during the development process to enhance military training effectiveness.
- Setup and execution of Cisco switches, routers, Port and MAC security.
- Configure, maintain and utilize multiple ERF and ABCS system platforms to include JDLM, BCS3, JCATS, VBS2, AFATDS, CPOF, FBCB2 and MCS.
- Provides technical support for the Automated Security Incident Measurement (ASIM) system, McAfee HBSS, CISCO Intrusion Detection System (CIDS), Information Operations Platform (IOP), Integrated Management Suite (IMS), and Network Defense (NetD) security suite.
- Implements security controls for the network intrusion system including network, component systems, and applications ensuring the overall security effectiveness of all Air Force bases.
- Maintains and configures McAfee servers (4010/4050), CISCO ASAs (Adaptive Security Appliances), and Active Directory.
- Standardized configurations for network operation center (NOC) infrastructure.
- Provided rapid resolution to technical problems related to sensors, Cisco VPN systems, Network Load Distribution Systems, CIDD directors, and IMS Networks, ensuring adherence to established procedures and group policies.
- Supported military exercises in roles of project officer and assistant, ensuring smooth operations and execution.
- Held Top Secret clearance with Sensitive Compartmented Information (SCI) designation for access to classified materials.
Multiple Launch Rocket Specialist
US Army
01.2004 - 01.2013
- Completed extensive training in Multiple Launch Rocket systems, networks, and computer operations.
- Collected and analyzed data for the Multiple Launch Rocket System to support operational readiness.
- Utilized tactical voice and data networks to ensure effective communication for MLRS operations.
- Obtained secret security clearance in January 2005.
Database Engineer/Systems Engineer
CACI
01.2009 - 01.2011
- Experienced JDLM Database Manager with 4 years of experience in all phases of JDLM administration and development.
- Manages small and large JDLM database supporting a number of military based exercises with responsibility for database design, development and operation.
- Execution and maintenance of UNIX and Linux systems, Microsoft SQL and Oracle database completion and maintenance.
- Configured and troubleshot BCS3 systems, ensuring operational readiness for military exercises.
- Configure, maintain and utilize multiple ERF and ABCS system platforms to include JDLM, BCS3, JCATS, VBS2, AFATDS, CPOF, FBCB2 and MCS.
- Identified client and user requirements during the development process.
- Developed and set up network infrastructure to enable effective communication between systems.
- Setup and execution of Cisco switches, routers, Port and MAC security.
- Coordinated logistics and support as project officer and assistant project officer for multiple military exercises.
Education
Kaplan University
02.2026
Skills
- SD-WAN implementation
- Palo Alto Networking
- Data center networking
- Disaster recovery planning
- Wireless communication design
- Network troubleshooting
- Circuit turn-up
- Network capacity planning
- IP address management
- Network automation tools
- LAN configuration management
- Routing protocols expertise
- Network architecture design
- Cloud networking solutions
- Network troubleshooting expertise
- DNS and DHCP administration
- Multicast routing
- Firewall management
- Network hardware upgrades
- Verbal communication
- Team building
- Database management
Professional Overview
Senior Network Engineer with over 15+ years of experience in designing, implementing, and optimizing complex WAN/SD-WAN infrastructures, with proven expertise in migrating legacy networks to SD-WAN, improving network performance, reducing downtime, and utilizing automation to deploy branch devices rapidly. Palo Alto experience, specializing in securing, configuring, and managing enterprise-level firewall infrastructure. A results-driven Senior IT Systems and Network professional with extensive experience in systems and network administration, network engineering, technical support and help desk support specialist Level 2/Level 3 with in-depth expertise in new server builds and rebuilds, development, implantation, configuration, troubleshooting, analysis, problem solving, optimization, project management, best practices, change management. Successful proven experience within vast roles and responsibilities from systems engineering, network engineering, database engineering, technical support, helpdesk support and in providing superior customer service. Proven track record for diagnosing complex problems and consistently delivering effective solutions and superior performance.
Certification
- EC-Council: CEH, 01/01/13
- CompTIA: Security +, 01/01/13
- CompTIA: A+, 01/01/08
- CompTIA: Network+, 01/01/08
Timeline
Senior Network Engineer
Diebold
01.2014 - Current
Systems Engineer / Network Engineer / Database Engineer
CSC Lackland AFB
01.2011 - 01.2014
Database Engineer/Systems Engineer
CACI
01.2009 - 01.2011
Multiple Launch Rocket Specialist
US Army
01.2004 - 01.2013
Kaplan University