Network Engineer Data Centers

Alex Raytselsky

(***) ***- **** ********@*****.*** linkedin.com/in/alex-raytselsky-840147

PROFESSIONAL SUMMARY

Senior Network Engineer with over 10 years of experience in leading complex data center and network solutions, specializing in Cisco, VMWare, and cloud infrastructure

. Proven track record in designing, implementing, and optimizing highly secure and scalable network environments for enterprise clients. Adept at troubleshooting critical issues, driving cost-saving initiatives, and managing cross-functional teams in high-pressure situations. Strong background in automation tools, routing protocols (BGP, OSPF, EIGRP), and network security, with a passion for adopting and implementing groundbreaking technologies.

Technical Skills: Cisco routing & switching VMware (5.5 - 7.0) Cloud networking (AWS, Azure) Python REST API Ansible Nexus 9000 series switches Nexus Dashboard ACI EVPN VXLAN Data Center Network Management Kubernetes Docker SNMP (v1/v2/v3) ESXi KVM Hypervisor Cisco DCNM APIC/ACI SQL MySQL) Elasticsearch Kibana VMware ESXi hosts Bash scripting PowerShell Linux admin tools Cisco routing protocols (BGP, OSPF, EIGRP, ISIS) VLAN (VTP, Trunk, STP, dot1Q) Network monitoring (NMS, Ixia, Wireshark) Cisco EVPN VXLAN Cisco ASICs Routing & forwarding protocols Load balancing Firewall configuration Agile/Scrum Continuous Integration/Continuous Delivery (CI/CD) Automation using Selenium RDBMS Web technologies (HTML, XML, JSON) Wireshark Visio SolarWinds

Soft Skills: Problem-solving Analytical thinking Cross-functional collaboration Leadership Communication (oral and written) Incident management Project management Attention to detail multi-tasking Prioritization Self-motivation Teamwork Independent work Solutions-oriented Proactive attitude Customer service

PROFESSIONAL EXPERIENCE

Sr. Network Engineer at WWT RGA Remote Nov 2024 – May 2025

Measuring network performance

Building network connectivity & configurations

Designing & Implementing Data Center LAN and Edge WAN network

Define, documenting, and enforcing network standards. Maintain Network Drawing Diagrams

Scheduling and completing upgrades to network equipment.

Device upgrades and RMA

Using SolarWinds for IPAM centralized IP address management

Working knowledge and experience with Cisco EVPN VXLAN and Cisco DCNM and Nexus Dashboard SDN environment.

Established L3 Construct (Layer 3) connectivity to external fabrics from VXLAN fabric using Multi Site Domain (MSD).

Decommissioning VXLAN and MSD Fabrics

Managed and configured Fabric and Network Definitions, such as (VLANs and VRF’s)

IPAM, (IP Address Management,) software system that helps manage and track a network's IP address space and micro segmentation

Greenfield and Brownfield using new deployment of switch discovery as well Brownfield for migration purposes and RMA

Familiarity with day-to-day tasks and projects common to Data Center Operations (deployment, migration, decommissioning etc.)

Supporting multi-tenant infrastructure for Nexus Dashboard

Sr. Network Engineer Center Kyndryl Inc. (IBM Company) Remote Oct 2020 – Nov 2024

Work closely with cross-functional teams to ensure that security measures align with the company's strategic goals and objectives.

Measuring network performance

Building network connectivity & configurations

Troubleshooting & resolving network issues and outages

Designing & Implementing Data Center LAN and Edge WAN network environments, cloud networking and security constructs (DMZ)

Experience working with Simple Network Management Protocol (SNMP) and Network Management System (NMS) applications used to monitor networked devices.

Define, documenting, and enforcing network standards. Maintain Network Drawing Diagrams

Scheduling and completing upgrades to network equipment.

Strong knowledge of Layer 2 and Layer 3 technologies

Expert-level experience with routing protocols BGP, EIGRP and OSPF

JIRA, confluence, Tableau, ticketing Remedy and Service Now.

ISP and/or carrier backbone engineering experience/knowledge

Market data/extranet engineering experience/knowledge

Working knowledge and experience with Cisco EVPN VXLAN and Cisco DCNM and APIC/ACI switching environment.

Conceptual Firewall, Load-Balancing, Routing & Switch knowledge

Incident management

Programming / Scripting background with knowledge of Python, REST API and Ansible Playbook

Working knowledge of Agile/Scrum, experience adopting or leading continuous integration and continuous delivery concepts and frameworks

Excellent problem solving and analytic skills to effectively address the needs of customers, including experience handling problem escalations and notifications.

Ability to gather requirements, analyze alternatives, test options, configure devices and recommend, document, and communicate highly technical solutions.

Strong communication skills (oral and written) and technical understanding to take complex technical concepts and present them to a range of technical and non-technical audiences.

Great ability to work independently during on-call support.

Self-motivated, solutions oriented, and pro-active.

Proficient use of software such as Confluence and Remedy

Experienced working in a large enterprise environment with a keen focus around security, availability, resiliency, and performance.

Familiarity with day-to-day tasks and projects common to Data Center Operations (deployment, migration, decommissioning etc.)

Supporting multi-tenant infrastructure for both Nexus Dashboard and ACI (Application Centric Infrastructure)

Cisco WLAN

Conduct regular vulnerability assessments and penetration tests to identify weaknesses in the network infrastructure and address them effectively.

Collaborate with security technology vendors and stay informed about the latest security products and features.

Working knowledge of Citrix NetScaler ADC, setting up and managing traffic during DDoS attacks, making sure traffic gets to critical applications. Additionally, checking NetScaler's logs of network activity feed into Citrix's cloud-based analytics service and are used to analyze and identify security risks.

ACL’s, Policy-Based Routing, Route-Maps, Prefix-lists

PAM (Duo, Beyond Trust and CyberArk)

Extensive experience in a Network Operations Center (NOC), Security Operations Center (SOC), or Incident Management Operations Center

Strong understanding of NAT/PAT

Customer Success Engineer Cisco

Jun 2013 – Oct 2020

Proof of Concept Scale Testbed with all DCNM applications running longevity

Kubernetes with Scale aspect

VMware Scale 4,000 VM’s 60 Virtual Switches and 50 ESXI hosts

Dockers, Kafka, Zookeeper app deployment and troubleshooting

Working knowledge of REST API’s and Postmen

Elasticsearch (database) Kibana troubleshooting/Dashboard

ESXI and KVM Hypervisor deploying OVI and ISO virtualization formats

VMware 5.5, 6.0 and 6.5/6.7 and 7.0 with Kubernetes scale

Troubleshooting and running bash scripts (installation and updates)

Deploying and modifying VM using ova (open visualization appliance) and iso

Tacacs/Radius configuration using ISE 3.0

SNMP extensive knowledge of SNMP V1/V2 and V3 for monitoring and capturing alarms and traps from nexus switches

VMware 5.5, 6.0 and 6.5/6.7 and 7.0 and PowerShell

Linux admin tools to run bash, scripts and basic troubleshooting

Write, review and approve Method of Procedures (MOPs)

Managed information repositories within the team’s internal documentation system

Basic automation knowledge and comfortable in scripting

Outstanding communication and project management skills.

Strength in multi-tasking, prioritization, attention to detail, and organization

Conceptual knowledge on RDBMS

Working knowledge of Web Technologies (HTML, XML, JSON)

Technical Lead/ Integration Test Cisco

Feb 2002 – Jun 2013

Highly proficient in Testing Nexus 9000 series of switches, including scale

Extensive knowledge of Cisco ASICs in Nexus 6000/7000 and 9000 series hardware

Extensive knowledge in troubleshooting the packet flow in a Nexus switch, verifying L2 and L3 hardware programming and stats, FIB, Adjacency, ACL TCAM’s, troubleshooting using Ethereal capture tools

Successfully implemented performance, scalability and stress testing. Exercising the TCAM’s with scale number of routes, sending streams to all the entries, measuring convergence.

Nexus 5000/6000, 7000 and 9000 Datacenter switches

EVPN, Fabric Path and Classical Ethernet mode L3 Scale Testbed, using Automated scripting in Python and Selenium, and also tcl/tk

Routing Protocols OSPF, ISIS, BGP

Routed Protocols (TCP/IP IPv4, IPv6, IP Multicast, TCP, SMTP

VLAN (VTP Domain, Trunk, inter VLAN routing, STP, dot1Q, ISL)

Test Equipment used (Ixia, Spirent Wireshark)

Network Troubleshooting Tool (Ethereal Packet sniffer, Span, Elam capture tools)

EDUCATION

B.S. in Computer Science Polytechnic University Odessa Ukraine

CERTIFICATIONS

Aviatrix Certified Engineer – Multi-Cloud Network Associate (Aviatrix)

AWS Certified Solutions Architect (Amazon Web Services)

Complete Guide to Dockers and Kubernetes (Udemy)

Cisco Certified Design Associate (CCDA, Cisco)

Cisco Certified Network Professional (CCNP, Cisco)

Managing LAN Networks with Cisco Nexus Dashboard (Cisco)

INTERESTS

GitHub

Blockchain Technology

Artificial Intelligence

Self-Development

Reading, Travel, Sports

Crossword Puzzles

Trading stocks, bonds and options, using Japanese Candle Sticks and Technical Analysis.

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