Lukáš Kleščinec
Network Architect
Profile
Network Architect with over 9 years of experience in IT, focusing on network design, automation, and administration for ISPs and data centers. My passion for networking began in high school, and over the years, I’ve honed my skills in building and managing complex network infrastructures, with a growing emphasis on automation for efficiency. I have led IT projects, guided a bachelor’s thesis on networking at my alma mater, and delivered presentations on various technical topics. Recently, I’ve started delving deeper into the DevOps world to expand my expertise.
Skills
Network Administration - Cisco/Mikrotik
Network Architecture and design - Campus/ISP/Datacenter
Linux (Ubuntu/Debian) Administration
Network Security
Automatization - Ansible AWX
Git
Python
Languages
Slovak (Native)
English (Fluent - C1)
Czech (Fluent)
Hobbies
Workouts
F1
Travelling
Cooking
Experiences
L3 Network Engineer/Architect
VNET a.s. · 2018 - Present
Designing, maintaining and improving core and datacenter networks – AS29405. Highest line of technical support responsible for research and development of network itself as well as all support systems (monitoring/automation/asset management etc.).
L2 Network Administrator
VNET a.s. · 2017 - 2018
Designing, maintaining and operations of ISPs distribution and access network, b2b and b2c segment in scale of up to 500 sites connected through fiber as well as wireless connection
Tester - Lending area
ZUNO Bank · 2017 - 2018
This work includes UAT testing of software infrastructure which consists of specific components connected via broker architecture.
Tester - project NEV
Soitron · 2013
Project “Electronic services of the national vehicle register”. Consisting of testing special hardware and software which is used in police cars
Education
Masters in Software engineering
Faculty of Informatics and Information Technologies, STU Bratislava · 2015 - 2017
Work on external module into OpenStack for effective scheduler configuration.
Thesis: Automation of virtual machines deployment
Bachelors in Computer and Communication Systems and Networks
Faculty of Informatics and Information Technologies, STU Bratislava · 2012 - 2015
This thesis included work with OpenVZ and creation of backend config service for Squid proxy service.
Thesis: Virtualization in IP networks
Secondary School of Electrical Engineering
Piešťany · 2008 - 2012
Projects
VNET Threat Perception Platform
2023 - 2026
Technical lead/Project coordinator
As part of DIGITAL-ECCC-2022-CYBER-03 call, VTPP aims to develop complex cybersecurity platform which covers complete protection and mitiagation of cybersec attacks on ISPs infrastracture and incident management. Platfrom consist of several independent system for example traffic anomalies detection fueled by AI, DDoS protection, RPKI validation etc. These systems are brought together by SIEM incident managament tool.
Fortinet SD-WAN
2022
Migration of customers infrastructure from old VPN hub-and-spoke concetrator design on top of IPSec tunnels. First implementation of SD-WAN technology at a company.
LightStorm Services s.r.o. – DC infrastructure buyout
2020 - 2021
Network Technical lead
This included physical migration of DC customers as well as migrating a large part of AS42005 into AS29405. I was responsible for new DC fabric architecture build on Cisco Nexus platform together with creating and executing of migration plan.
Redesigning and rebuilding of Datacenters network
2021
Cisco Nexus platform
Redesigning of Fabricpath technology accompanied by OSPF routing to deliver L3 connection to core network.
IPv6 stack on distribution network
2018
Mikrotik/Cisco implementation
As a young junior I seezed an opportunity of greenfield to developed and design IPv6 routing stack on distribution network. This contained subnet planning as well as methodology for later routing and prefix delegation to customers. That way we were able to offer IPv6 connectivity to our b2b customers.