Олександр

Oleksandr Zheliuk

Date of birth: 02/07/1982
Cell phone number:[open contact info](look above in the "contact info" section)
e-mail: [open contact info](look above in the "contact info" section)

Professional Summary
Senior DevOps Engineer with 23+ years of experience in IT infrastructure, cloud platforms, system
administration, networking and software delivery.
Expert in designing and operating Kubernetes-based platforms across AWS, Azure and GCP
environments. Extensive experience with Infrastructure as Code, CI/CD automation, observability, cloud
migrations and large-scale production systems.
Strong background in Linux administration, networking, hosting environments, automation and platform
engineering. Proven leadership experience managing infrastructure initiatives, mentoring engineers and
driving modernization programs.

Core Competencies

Cloud Platforms AWS, Azure, Google Cloud Platform (GCP)
Containers & Kubernetes, EKS, GKE, OpenShift, RKE, Docker
Orchestration
Infrastructure as Code Terraform, CloudFormation
CI/CD Jenkins, GitHub Actions, Bitbucket Pipelines
Monitoring & Prometheus, Grafana, ELK Stack
Observability
Programming & Python, Bash, Groovy, Perl, PHP, C++
Automation
Data Platforms Kafka, ClickHouse, Spark, Hadoop
Databases MySQL, PostgreSQL, MS SQL, Dynamo
Web & Infrastructure Nginx, Apache, HAProxy, OpenResty, Varnish, Postfix, Bind, Asterisk
Operating Systems Linux, Windows Server, FreeBSD
Networking BGP, OSPF, EIGRP, Cisco Routing & Switching

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CAREER HISTORY
Duration Mar 2019 – Present time
Company Delphi Software
Project Bittech (Scipio) CRM for trading platform
CRM and Web application built on top of Microsoft Dynamics for Forex company.

Nulia project.
Mobile application for zero trust personal data storage.
Team Size 30
Position Senior DevOps
Environment Kubernetes, AWS, Azure, Docker, Jenkins, GitHub Actions, Bitbucket Pipelines,
and tools: Prometheus, Grafana, Terraform, CloudFormation, Salt, Linux, Windows Server,
FreeBSD, ClickHouse, Kafka, Spark, Hadoop, Apache, Nginx, Postfix, BIND, Asterisk,
MySQL, PostgreSQL, HAProxy, Varnish, OpenResty
Responsibilities - Build Production and Development Environments
- Maintain and optimize CI/CD pipelines for multiple applications and
environments using Jenkins, GitHub Actions and Bitbucket Pipelines.
Modernized legacy infrastructure into Kubernetes-based microservices,
improving deployment consistency and maintainability.
Implemented Prometheus and Grafana monitoring for services across two
data centers, improving operational visibility and troubleshooting.
- Develop Python/Bash helper scripts and operational tools for the development
team; collaborate with customers and stakeholders.
- Monitor development and production systems; investigate incidents and
troubleshoot application and infrastructure issues.
- Manage and automate cloud environments using infrastructure-as-code and
repeatable deployment workflows.

Duration Aug 2013 – Mar 2019
Company “Hostpro” – hosting company.
Project Hosting Project
Team Size 10
Position Senior System Administrator
Environment Azure, AWS, Visual Studio, OnApp, Cisco
and tools:
Responsibilities - Ensuring the smooth functioning of the company's servers
- Installation, configuration, optimization, monitoring Shared / VPS / Dedicated
servers
- Optimizing company infrastructure for high load services

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- Audit of existing IT infrastructure with optimization purpose
- Writing and development of company application software (monitoring and
management) in PHP, Perl, C ++ bash

Duration Aug 2013 – Dec 2009
Company LaVin LLC
Project Bittech (Scipio) CRM for trading platform
CRM application built on top of Microsoft Dynamics for Forex company.
Team Size 3
Position Head of IT
Environment Cisco, Server technologies, MS SQL, MySQL, 1C 8.2
and tools:
Responsibilities - Company’s infrastructure managing (office, manufacturing, warehouse, and
logistics)
- Controlling of IT costs.

Duration Dec 2009 – Dec 2008
Company ISP iLink
Project Wireless ISP
Team Size 5
Position Senior System Adminstrator
Environment Cisco, C++, php, perl, linux, web servers
and tools:
Responsibilities - Project budget management
- Development of core optical network
- Development billing and access control systems (C + +, perl, php)
- Administration of routers and switches, Cisco.
- Improvement of a routing protocol for wireless networks MESH OLSR (on C +
+).

Duration May 2006 – Dec 2008
Company UkrNet LLC
Project News portal, internet service provider.
Team Size 4

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Position Senior System Administrator
Environment Cisco routers series 36xx, 8xx., OSPF, BGP, EIGRP, xDSL
and tools:
Responsibilities - Equipment continuity service provision
- Setup and configuration of switches and routers
- Configuration dynamic protocols
- Configure server systems based on Linux.

Duration Sep 2003 – May 2006
Company Mayak OJSC
Project Production infrastructure planning
Team Size 4
Position System Administrator
Environment AD, ISA, RDP, MS SQL, 1C, Cisco
and tools:
Responsibilities - Development of the company’s informatization project
- Deployment of IT infrastructure from scratch

EDUCATION and CERTIFICATIONS
1999 - 2004 Acquired Master’s Degree in State Technical University of Vinnitsa, informational
technologies and computer engineering (FITCE).

LANGUAGES
Russian, Ukrainian – Native; English – Intermediate.

PERSONAL QUALITIES
Analytical thinking, flexibility, communicability, responsible, quick learner, problem’s solving, customers and
result oriented.

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