Andrii

Andrii Stetsiuk
DEVOPS / SRE ENGINEER
Kyiv, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)

PROFESSIONAL SUMMARY
DevOps / SRE engineer with 20+ years in IT, including 5+ years in DevOps — progressing from systems administration and leading a
technical support department to operating production infrastructure on AWS. Specialized in Kubernetes (AWS EKS) and Docker
Swarm, Infrastructure as Code (Terraform), GitLab CI/CD automation and Prometheus-based monitoring. Hands-on experience in
incident response, performance and reliability troubleshooting (OOM, node load, alerting), vulnerability management and cloud
security. Focused on reliability, automating routine work and transparent collaboration with development teams. Holder of four AWS
certifications.

KEY TECHNOLOGIES
AWS · EKS · Kubernetes · Docker · Docker Swarm · Terraform · IaC · GitLab · GitLab CI/CD · ArgoCD · CI/CD · Prometheus ·
Grafana · CloudWatch · SonarCloud · Zabbix · Linux · HAProxy · Nginx · Nexus · Kafka · AWS WAF · IAM · AWS SSM · MySQL ·
Incident Response · Observability · Troubleshooting · Vulnerability Management · SRE · DevOps · ITIL

CORE SKILLS
Cloud Platforms: AWS (EKS, EC2, IAM, IAM Identity Center / SSO, IAM Roles Anywhere, Systems Manager, SSM Parameter Store,
WAF, CloudWatch), Hetzner
Containers & Orchestration: Kubernetes (AWS EKS), Docker, Docker Swarm, HAProxy, Nginx
Infrastructure as Code: Terraform
CI/CD & Artifacts: GitLab, GitLab CI/CD, ArgoCD, TeamCity, Nexus Repository; pipelines for .NET services
Monitoring & Alerting: Prometheus, AWS CloudWatch (dashboards), Grafana, Zabbix, Nagios
SRE Practices: incident response, root cause analysis, performance troubleshooting (CPU, memory, OOM, cgroups), backup,
disaster recovery (DR), 24/7 business continuity
Security: vulnerability management (CVE), AWS WAF, IAM, security incident investigation, Active Directory, Group Policy, VPN,
security policies
Operating Systems: Linux (Ubuntu, CentOS, FreeBSD), Windows Server
Databases: MySQL, MS SQL Server
Virtualization & Storage: VMware ESXi, Hyper-V, RAID, VxFlex OS (ScaleIO)
Methodologies: DevOps, SRE, ITIL, automation

WORK EXPERIENCE

DevOps Engineer April 2021 — Present
Temabit (Fozzy Group / Silpo) · Kyiv
● Operated and evolved production Kubernetes (AWS EKS) and Docker Swarm clusters for a microservices architecture.
● Built and maintained GitLab CI/CD pipelines (including .NET services) and GitOps deployments to Kubernetes with ArgoCD;
diagnosed and resolved build failures, certificate and permission issues.
● Provisioned AWS infrastructure with Terraform for integration projects (SSM Parameter Store, AWS WAF, IAM); managed
access via AWS IAM Identity Center (SSO).
● Monitoring and incident response: handled Prometheus alerts (memory utilization, unreachable EKS nodes), optimized
Prometheus metric cardinality and memory usage, built Grafana and AWS CloudWatch dashboards.
● Performance and reliability troubleshooting: analyzed CPU load on Kubernetes nodes (mapping processes to pods via
cgroups), investigated pod OOM crashes (exit code 137).
● Vulnerability management: assessed and remediated a Linux kernel CVE across ~70 hosts, automated with AWS Systems
Manager.
● Security: configured AWS WAF; investigated security incidents (suspicious remote access sessions, RDP brute-force) on
Windows Server.
● Load balancing and networking: HAProxy in Docker Swarm (zero-downtime graceful reloads), Nginx as a reverse proxy,
network traffic monitoring.
● Maintained Nexus Repository (blob store cleanup); performed MySQL database operations.
● Worked closely with development teams to optimize build and deployment processes.

System Administrator April 2018 — April 2021
Maklai · Kyiv
● Supported and developed hybrid infrastructure (on-premises + cloud).
Lead IT Specialist January 2017 — April 2018
First Realty Group Corporation (business process outsourcing for leading real estate agency networks) · Kyiv
● Ensured resilience of a distributed network: 15 branches, 2 data centers, ~1,000 users.
● Deployed and maintained monitoring systems (Zabbix, Nagios).
● Developed information security procedures and policies: corporate security, email protection, access control to network
resources and the Internet; security risk assessment.
● Organized backup, disaster recovery and 24/7 service continuity.
● Automated technical processes (scripts, Group Policy).
Head of User Technical Support January 2008 — December 2016
First Realty Group Corporation · Kyiv
● Built a first-line support team from scratch and implemented the OTRS ticketing system.
● Deployed and maintained a terminal server farm for remote work (Remote Desktop Services).
● Converted legacy hardware into diskless thin clients (Thinstation, open source).
● Ensured uninterrupted user operations and supported the company’s IT infrastructure.
System Administrator January 2003 — December 2007
Blagovist Real Estate Agency · Kyiv
● Administered servers, workstations, LAN and communication channels; provided user technical support.

CERTIFICATIONS
● AWS Certified Solutions Architect – Associate
● AWS Certified SysOps Administrator – Associate
● AWS Certified AI Practitioner
● AWS Certified Cloud Practitioner

EDUCATION

National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” 1997 — 2002
Faculty of Electronics · Information Technologies of Design, Computer Science · Bachelor’s and Specialist degrees.

LANGUAGES
Ukrainian — native | English — technical | Russian — fluent

ADDITIONAL INFORMATION
● Driver’s license, categories A and B.
● Willing to travel for business.