Network Administrator

Experienced network professional with expertise in SDWAN technologies and Cisco and Fortinet solutions. Skilled in providing support, troubleshooting, and designing custom solutions. Proficient in BGP, OSPF, VPN, and other networking protocols. Strong collaboration and communication skills, with experience in training and mentoring colleagues. Holds certifications in CCNA Routing & Switching and MTCNA. Dual education background with a focus on networking. Fluent in Slovak, Czech, and English. Enjoys outdoor activities and playing the guitar.

Network Consultant

(2022 September – current job)

• Mainly responsible for custom, non-standard solutions and migrations.
• Providing L4 support for SDWAN.
• Responsible for RCA, permanent and temporary fixes, adjusting the solution to resolve issues,documenting issues and solutions.
• Responsible for reporting design issues, proposing workarounds and modifications of design.
• Requesting and designing new features, including enhancements, risk mitigation and newfunctionalities.
• Responsible for research and initial test phase of new functionalities, workarounds, or customsolutions.
• Providing support to L2 and L3 teams during complex migrations, including support in planningphase.
• Providing consultations to customers, L2 and L3 teams, platform architecture and pre-salesarchitecture teams.
• Collaboration with network architecture and pre-sales architecture teams on creating newfeatures.
• Conducting SDWAN training sessions for L2 and L3 teams.
• Working with same technologies as described below.

Network Engineer

(2020 September – 2022 August)

• Worked with Cisco Viptela (vEdge 100b, 1000, 2000, ASR1001X/HX, ISR4331, C8300-1N1S/2N2S, C1111, C1161, C1109LTE, ISR11004G/6G (Viptela and IOS XE software), vEdge Cloud, CSRV1k, C8000V and ENCS) and Fortinet (VM64KVM, 60E, 100F) SDWAN technologies.
  • Worked with Cisco CSO/NSO, ESC, OpenStack, PNP.
  • Worked with C9300L, Nexus 9000 and ASR9K.
  • Deep knowledge of Cisco Viptela and Fortinet SDWAN solutions (eg. traffic engineering using PBR,QoS, AAR, SLA, health-checks, On-demand/ADVPN tunnels, ZTP, OMP).
  • Worked with AWS, Zscaler and Umbrella SIG.
  • Worked with BGP, OSPF, VRRP, VPN, NAT, BFD, Syslog, Cflow, ZBFW, UTD.
  • Providing L3 support for SDWAN and orchestration (including RCA and quick workarounds forcustomers).
  • Part of FP team where closely worked with NSO developers.
  • Functional, integration, regression and sanity testing of network features developed by FP team.
  • Responsible for troubleshooting FP and design related issues.
  • Providing RCA, solutions and/or workarounds for FP and design related issues.
  • R/B migrations in pre-production and production environments (including troubleshooting,recovering VNFs, restoring devices and providing RCA).
  • Executing customer’s specific migrations (including applying necessary manual configuration into their solution to support the migration and proposing/designing best migration approach for the customers).
• Providing consultations to customers, pre-sale engineering team, platform architecture team, FP team, and product management team.
• Experience with Jinja templates.
• Responsible for LLD of Fortinet SDWAN solution (ADVPN, IKE, IPSEC, BGP, SDWAN, health-checks,services, neighbors, AAR and QoS), including design, testing, implementation, and documentation.
• Worked closely with Cisco TAC engineers and Fortinet architects.
• Worked closely with Cisco’s lead software engineers and architects as Cisco Red Badge to deliverproducts to Ngena.
• Providing internal trainings to OPS and orchestration support teams.
• Worked with waterfall and agile approaches.
• Providing technical expertise at job interviews.
• Assessing and mentoring new colleagues.

Network Engineer in FCI Connectivity team

(2020 April - 2020 August)

- New project, mostly operation tasks.

• Incident and change management.
• Worked with Cisco ACI, NSO, OpenStack, Nexus 9000 and CSR1000V.
• Cooperation with architecture and software engineering teams.
• Worked with agile approach.

Network Administrator in WSA team

(2018 - 2020)

- Responsible for complex solutions, migrations, and maintenance activities.

• L2/L3 support, deep analysis and troubleshooting activities.
• Providing RCA and documentation.
• Consultations with customers and other stakeholders.
• Responsible for complex upgrade of WAN routers/switches where zero outage was mandatory.
• Worked with Cisco (Catalyst, ASR, Nexus), Brocade (VDX, MLX) and Huawei (NE9000).
• Worked with MP-BGP, OSPF, EIGRP, ISIS, MPLS, VPLS, HSRP, VRRP, VLAN, VRF, VPC, VDC, VSS, STP.
• Worked with SM9, HPNA, Wireshark.
• Worked on Linux bash scripts to provide automated pre/post-check.
• Connections to Internet, MPLS and 3rd party service providers.
• Incident, problem and change management.
• Attending safeguarding and CAB calls.
• Pro-active checks to mitigate potential risks.
• Created operation manual for newcomers.
• Trainer at DCNO network farm (November 2019 – December 2019).

Network administrator in DCLAN Implementation, DCLAN RUN and WSA team (part-time)

(2015 - 2018)

• Mostly responsible for new build-ups, decommissions and various troubleshooting activities.
• L2 support, troubleshooting calls with customers.
• Attending calls with customers to clarify solutions.
• Worked with MP-BGP, OSPF, EIGRP, ISIS, MPLS, VPLS, HSRP, VRRP, VLAN, VRF, VPC, VDC, VSS, STP.
• Worked with Cisco (Catalyst, ASR, Nexus) and Brocade (VDX, MLX).
• WAN and LAN datacentre connections.
• Improving system management, capability management and monitoring.
• Incident, problem and change management