Sergey dreik Kolesnik

Senior DevOps Engineer @ WaveAccess

Profile

Senior DevOps Engineer with 20+ years of IT experience in systems administration, engineering, and architecture. Strong problem-solving mindset, attention to detail, and a proven track record of managing and optimizing IT infrastructures. Consistently delivers high-quality solutions in fast-paced, collaborative environments.

Experience

22 years of IT experience since 2003.

Senior DevOps Engineer
Multi-brand restaurant company
2023 — now
  • Implementing DevOps practices to speed up code rollouts.
  • Reduced cloud spend by over $1M/year through stack review, leftovers cleanup, and resource optimization across multiple acquired stacks.
  • Reduced security breaches using reports from the security department.
Senior DevOps Engineer
Online travel booking platform
2021 — 2024
  • Integrated a newly purchased travel system into existing infrastructure.
  • Built and configured a Microsoft SQL Server AlwaysOn cluster for high availability.
  • Set up Zabbix monitoring and automated CI/CD pipelines with GitLab and PowerShell.
Senior Systems Engineer
dnata Emirates
2016 — 2023
  • Implemented comprehensive monitoring with Zabbix.
  • Provisioned AWS cloud infrastructure for the BI team with IPSec tunnels.
  • Built Hyper-V clusters and SQL Server AlwaysOn for high availability.
  • Installed and supported on-premise Kubernetes clusters.
Senior Systems Engineer
Travel.ru (Oktogo Group)
2011 — 2025
  • Redesigned production infrastructure for performance and scalability, migrated it to AWS, and later off AWS to a Russia-based provider for legal compliance.
  • Led antifraud and payment security.
  • Achieved PCI DSS certification.
Interim CTO
Swedbyte
2011
  • Supervised IT operations.
  • Designed hosting/ASP architecture.
  • Led the redesign of infrastructure for key clients.
CTO
Dnevnik.ru
2010 — 2011
  • Supervised IT operations across six offices (Kharkov, Kiev, New York, St. Petersburg, Tbilisi, Tel Aviv).
  • Led the client support desk.
  • Achieved Federal Law #152 "Personal data" certification.
Systems Engineer
Paladyne Systems
2006 — 2010
  • Designed and administered the ASP architecture and a globally distributed VMware ESX farm.
  • Administered Citrix servers delivering Paladyne System Suite.
  • Supported internal systems across Hong Kong, London, New York, San Francisco, and St. Petersburg.
Senior Systems Administrator / Architect
DataArt
2004 — 2006
  • Supervised IT operations in St. Petersburg and redesigned the user support process.
  • Supported internal systems worldwide and serviced requests for international customers.
  • Implemented Microsoft CRM internally and for customers.

Skills

Platforms & Languages

  • MS Windows
  • Linux
  • MacOS
  • Shell
  • PowerShell
  • T-SQL

Databases

  • MS SQL Server
  • PostgreSQL
  • MySQL
  • MongoDB
  • Redis
  • ClickHouse

Web Servers

  • Nginx
  • Apache
  • Microsoft IIS
  • Apache Tomcat

Cloud & DevOps

  • AWS
  • Docker
  • Kubernetes
  • Terraform
  • Ansible
  • VMware

CI/CD

  • GitLab
  • TeamCity
  • Bitbucket
  • Octopus
  • Jenkins
  • GitHub Actions
  • CircleCI

Monitoring

  • Zabbix
  • Nagios
  • SCOM
1986 - 2026 © Sergey dreik Kolesnik