Aleksei Berezin Email and Phone Number

Responsibilities:• Managing, monitoring, update of distributed world-wide PoP (Point of Presence) network.• Interaction with Tier-I ISPs for various issues.• Traffic balancing taking into account the specific usage of BGP anycast announcing.• Carrying out emergency recovery and planned activities.• Carrying out deployment and firing-up of new PoPs.• Customers support (advanced level/2-3 line).• PoPs resource usage forecasting.• Documenting.Functions, achievements:• Implementation of the build server aimed for creating CPU-arch depending OS images.• Launch of several new PoPs (RU,BH,AE,JP) - on-site and remote participation.• Participation in the training of new employees.• Maintaining of dedicated Atlassian software.

Responsibilities:• Development and operation of ISP network.• Managing of private cloud server group.• Documenting.• Increasing the level of the network management system integration. • Managing of various dedicated Linux-based systems.• Managing of Vmware vSphere clusters.Functions, achievements:• Implementation of configuration backup system for heterogeneous network equipment set.• Implementation of service monitoring system.• Merging of acquired ISP network.• Precision tune-up of datacenter network for private cloud clusters usage.• Increasing the level of network equipment security protection.• Complete rebuild of managed autonomous system external connectivity.• Implementing of automated anti-DDoS protection system based on fastnetmon, exabgp, bird routing daemon.• Implementing of centralised fault-tolerance authorization system for internal resources.• Launch of product based on Vmware Horizon virtual desktop with nVidia vGPU GRID K2 3D-acceleration.• Participation in implementing of high-performance SAN cluster (tiered storages, iSCSI).

Responsibilities:• Productive expirience with wired and wireless equipment of Zebra Technologies (Symbol/Motorola in the past).• Tecnical documentation development, participation in project documentation development.• Inspection of fresh installed Wi-Fi deployments.• Performing of a radio wave Site Survey (both pre- and post-installation).• Handing over of an implemented project to a customer.• Advanced customer support.• Creating of a thermal-colored maps with Wi-Fi coverage, SNR, and other radio metrics using specialized toolkit.• Advaced customer suppport with RFID solutions, PDT (portable data terminal), PDA, portable barcode printers and scanners.• Participation in implementation of Captive portals for public Wi-Fi.Functions, achievements:• Configuring of Motorola/Zebra Wi-Fi controllers (RFS, NX, VX, WiNG 5.x); network switches; Wi-Fi access points.• Implementation of Wi-Fi covered areas (802.11a/b/g/n/ac) for malls, logistic warehouses, outdoor spaces (all-weather).

Responsibilities:• Design and implementation of network solutions with fast convergence.• Planning network changes• Adjusting network infrastructure to the frequent project changes.• Network documentation, automation and monitoring. • Network equipment management integration with existing project configuration management system • Arranging of fault testing on different network topologies.• Consulting colleagues during emergencies.Functions, achievements:• Experience with network equipment of Extreme Networks, Cisco, Hewlett Packard (eBGP, iBGP, OSPF, VRF, BFD, MLAG, LACP, VRRPv3, ITU-T G.8032, 802.1q, QoS, ELRP, IGMP, LLDP, SNMP, ACL , AAA, TCL Embedded scripting).• Implemented redundant network topology clusters with extra-short recovery time (tens of ms).• Deploying a high availability (HA) services using IPVS, BIRD, OSPF + BFD.• Creating a backup system for network devices configurations on top of corporate GIT (Perl scripting + git cli).• Developing and deployment End-to-End QoS on network with RTP services.• TCL-scripting on switches, intercepting and modifying log messages, dynamic interface descriptions updating.• Deployment of network monitoring (Cacti / riemann), collector of network equipment system messages (rsyslogd / logcheck).

Responsibilities:• Design of the large hosting provider distributed network (based on the Cisco equipment, over 8000 ports).• NOC, autonomous system managing.• Coordination of planned equipment upgrades.• Interaction with network providers of various tiers.• Coordination of recovery operations at the company's network infrastructure.• Tweaking of various network equipment to improve fault tolerance.• Making presentations for related departments about design and principles of company's network.• Support and improving of office VoIP-based system (asterisk).Functions, achievements:• Experience with Cisco network equipment (IPv4 / IPv6 dual stack, eBGP, iBGP, OSPF, LACP, HSRP, RSTP, VTP, 802.1q, QoS, SNMP, ACL, AAA, CoPP, Policy Routing, Prefix Filters, Shaping).• Design of high-speed (≥40GBPS Ethernet) metro scaled backbone network using DWDM, EDFA, optical circulators.• Fine-tuning QoS on MLS Catalyst 6500 (Sup720) considering the line card capabilities.• Implementation of DOS/DDoS protection system: blackhole-route server based on FreeBSD & BIRD (blackholed routes exported to upstream ISP's).• Deploying a high availability (HA) services using IPVS, BIRD, BGP.• In-depth study and deploying of advanced control-plane policing (CoPP), hardware rate limiting (HWRL) for Sup720-3BXL (CFC).• Designed core network upgrade from MLS 6500 / Sup720-3BXL to a group of Cisco Nexus 5596.• Running IPv6 for shared hosting systems.

Responsibilities:• Organising and structuring the interaction with related company’s departments.• Automation of department workflow.• Network and server equipment QC, automation of testing and updating.• Interaction with network and technical support of European service/datacenter provider.• Department regulation, creating operation manuals, staff training.• Management of planned and emergency activities of various complexity.Functions, achievements:• Department Management (technical sphere).• Control of the planned activity on the network backbone channels, documenting.• Experience with hardware of IBM, HP, Dell, Kraftway / Intel, Supermicro, ETegro.• Checking the smooth operation of datacenters management systems and development of recommendations for technical services optimisation.• Launch the technological platform in the Netherlands, automation and regulation of its activities.• Created a low-cost base OS network installation service for company's and customer’s servers.

The head of customer service center• Establishment of the service center "from scratch", it managing.• Design and implementation of simple network solutions.• Retail / wholesale, productive cooperation with business key customers.• Resolution of conflicts with consumers.