Denis Zadonskii
PROFILE
A bright, resourceful and self-motivated person, with a strong background in system administration, networking, security and
management.
Always looking for challenges to expand my knowledge and experience.
A logical thinker; Able to adapt to any situation or environment, prepared to work hard to achieve results and meet targets.
Resistant to stress, able to operate under strong pressure and act quickly in unexpected situations.
PERSONAL
Email:-Mobile: -
Nationality: Latvia
Location: Las Palmas de Gran Canaria, Spain.
Skype: d_zadonsky
Driving: B driving license (EU)
TECHNICAL QUALIFICATIONS
Microsoft Certified Professional (MCP)
Akamai Certified in Content Deliver, Media Streaming and Security
TECHNICAL EXPERIENCE OVERVIEW
Network Hardware
Cisco
Juniper
HP
Mikrotik
Fortinet
Web / Application servers
Databases
Operating Systems
Micorosft
Linux
Apple
Server Hardware
Monitoring / Logging
Network Protocols
VoIP
Storage
Virtualization and
Containers
Sourcecode / CI / CD
Cloud
CDN
Scripting
2750, ASA 5510 / 5515-X (Firepower)
EX3300
Various switches
Various models
FortiGate 100D
Nginx / Apache HTTPD / Apache Tomcat, Microsoft IIS
MySQL, MySQL Cluster, MySQL Galera / Percona XtraDB, MariaDB
Microsoft SQL Server 2005 – 2016
MongoDB
CouchBase
GreenPlum
Postgres
Windows 95,98,2000,XP,7,8,10, Server-
RedHat / Centos / Fedora, OpenSuse, Debian / Ubuntu, Archlinux, Gentoo,
Alpine
MacOS X
Dell, HP, Intel, SuperMicro
Nagios, Munin, Cacti, Prometheus / Grafana, NewRelic, ELK / Kibana, OSSEC
/ OSSIM
TCP/IP, OSPF, BGP, VRRP, IPSEC, OpenVPN , WireGuard
Asterisk
CEPH, Microsoft DFS, GlusterFS, DRBD / GFS2, FreeNAS, ZFS, iSCSI, NFS,
Samba, Minio
VMWare vSphere, XEN, KVM / Proxmox / OpenStack / oVirt, Hyper-V,
VirtualBox, Parallels , Docker, Mesos, LXC, Kubernetes
SVN, GIT / Gitlab, Jenkins, SonarQube, Ansible, Terraform, Puppet
AWS (EC2, RDS, VPC, ELB,ElasticCache), GCP
Akamai, CloudFlare, StackPath
Shell / Bash, Python, CMD
EMPLOYMENT EXPERIENCE
Company Name: Kentech SLU
DevOps Engineer / System Administrator
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Part of the Sportpesa group, Kentech is a recognized provider of custom solutions across various verticals, specializing in the
online entertainment industry with focus on sports in multiple countries. Kentech offer turnkey large-scale computing solutions,
systems support, web development and web-based applications, customized for the specific market needs and demands.
Employed as a full time DevOps / SysAdmin, duties include:
Solutions Design and consultancy: working closely with the project managers / developers and QA to ensure design
issues are identified and project risks are mitigated as early as possible. Working closely with different layer staff to produce
the requirements and deployment procedures to ensure successful product delivery.
Office Infrastructure Engineering and Management: Supporting existing office server and network infrastructure to ensure
compliance with operational standards of the company. Researching, Designing and Improving the infrastructure to meet
expectations for the future.
Technical Document Writing: creating, updating, and submitting detailed design documentation on infrastructure and
deployment procedures.
Solution Implementation: Working with various teams in different countries to make sure product is successfully deployed,
tested and released across different environments (pre-production, uat, production). Assisting as necessary with
troubleshooting and fixing of discovered issues.
Day to day activities:
Configuration and management of VMWare vSphere cluster. Researching and conducting Proof of Concept deployments,
performance testing of different VMWare alternatives (oVIrt, Proxmox + CEPH, Nutanix).
Configuration and management of different network equipment. Cisco ASA 5515-X (Firepower Edition), Fortigate, Cisco
Nexus, Juniper, HP switches. DNS, DHCP, VLAN, VRRP, Firewall, VPN.
Writing pipelines for internal CI / CD environment. Building custom docker images, deployment scripts, code control ensuring that requirements on code coverage, unit tests, integration tests, SAST are met, pipelines executes correctly, and
reports are published in SonarQube / Gitlab
Maintaining local software infrastructure for Dev and Test environments for different countries. Application stack include
Docker, Mesos, Nginx / HAProxy, PHP, Java, NodeJS, MongoDB, MySQL Cluster (NDB), RabbitMQ, Couchbase, Redis,
Memcached.
Participating in meetings across different layers to improve processes and product quality.
Designing and maintaining various support services / infrastructure like Active Directory / Centralized authentication,
Backups, PXE / Local package repository (Java, Operating systems), Monitoring and alerting.
Projects undertaken whilst with Kentech:
Migrated internal software stack from individual services running inside Virtual Machines to Docker containers. At later stages
– assisted / was in charge of migrating also the pre-production stacks in different countries as well as training local teams.
Setup several pre-production and production environments within Sportpesa. Hardware and Software stack configuration and
training of local support teams.
Internal network logical segmentation into VLANs for added security and further separation on network layer Dev and Test
environments in various countries.
Leading Akamai platform implementation within Sportpesa to make sure infrastructure is able cope with the increasing amount
of traffic.
Company Name: 77Agency
Senior System administrator, IT team lead, IT Manager
2004 – 2017
77Agency is an independent agency with a 360° performance-oriented approach to digital marketing and creative
communication. With headquarters in London, UK and offices in Latvia and Italy 77Agency employs around 150 people.
Employed in the IT team, duties include:
Network Design and Engineering: Designing, Implementing and maintaining network infrastructure within the offices and
datacenters.
Hardware and Software Solution design and Engineering: Researching, Designing, Implementing and maintaining Office
and Datacenter hardware and software infrastructure.
Policies and procedures: Designing and Implementing various operational and security policies and procedures, ensuring
they are being followed by all employees in the company.
Technical Documentation: Creating, updating, and submitting detailed design documentation on infrastructure, procedures
and policies.
Management and operations: Responsible for overall operability of the entire company IT, including several people in
different departments to make sure company IT is operating according to stakeholders’ expectations. Conducting /
Participating in employees performance review and hiring process. Producing monthly P&L reports for the IT department.
Projects undertaken:
Build entire company infrastructure from the ground – joined the company in a very early stage with 20 people and 5 servers
and in the next 10 years expanded IT infrastructure to nearly 400 servers, designed and implemented various processes and
hired necessary personnel to ensure stable operations of the IT department.
Setup a local Openstack and CEPH clusters to ensure quick deployments of Dev and Test environments.
Setup an internal VoIP communication system based on Asterisk, which was also used by the monitoring system to
automatically notify / call employees participating in 24x7 support rotation.
Setup Live environment based on both Hardware (Datacenter) and Virtual (Cloud providers) servers for both internal and client
related projects.
Set and achieved a goal for the company to become a Microsoft Gold Certified partner.
Designed the infrastructure side of several successful internal projects:
o 77Tracking – website visitors tracking solution.
o 77Diamonds – jewellery store (When it was operating under 77Agency group)
o 77Tool – Ads Management platform across different provides (Google, Microsoft, Facebook etc).
o AllInOneSocial – Social Network management platform
o Gotu.io – Facebook advertising platform. Platform was deployed purely in AWS across different availability zones.
Day to day activities:
Configuring and Managing network and server infrastructure to ensure stable operations. Troubleshooting internal and
client applications.
Participating in meeting with Key developers / Team Leads to make sure applications meet standards and best practices
and are deployable fast and effortlessly on the infrastructure.
Participating in Performance, Availability and security review / testing of current applications.
Implementing Akamai services for various clients
Managing teams of system administrator spread over several roles within different departments.
EDUCATION
ISMA, Riga, Latvia.
Enrolled in 2002 and achieved Bachelor of Information Technology, System Analyst in 2006
INTERESTS
Researching and improving various technologies. Understanding various processes around me.
Music. Photography.
REFERENCES
Available on request.
2002 - 2006
