Hi! I’m Serhii Chechulin

Who am i?

Experienced DevOps Engineer with a strong background in system administration, automation, and cloud infrastructure. Over 15 years of IT experience, including leadership roles as CIO and extensive hands-on expertise in CI/CD, Kubernetes, Infrastructure as Code (IaC), and observability.

Proficient in designing and implementing GitOps-driven deployment pipelines using GitLab CI, ArgoCD, and FluxCD, enabling seamless application delivery. Skilled in container orchestration with Docker, Kubernetes, and Cri-O, as well as managing scalable cloud environments on AWS (EC2, S3, ECS, EKS).

Strong expertise in monitoring and observability, utilizing Prometheus, Grafana, Zabbix, and the ELK stack (Elasticsearch, Fluent Bit, Kibana) for system insights and troubleshooting. Extensive experience in database administration for MySQL, MariaDB, PostgreSQL, including high-availability configurations with Patroni and ProxySQL.

Capable of managing large-scale Linux and Windows infrastructures, with experience in VMware ESXi, Proxmox, Hyper-V, and network security solutions like WireGuard VPN, Cisco ASA, and Fortinet. Adept at scripting and automation using Python, Bash, and PowerShell, enhancing operational efficiency.

Proven track record of leading DevOps transformations, optimizing infrastructure for startups and enterprises, and ensuring high availability, security, and scalability. Passionate about automation, infrastructure optimization, and continuous improvement.

EDUCATION

HIGHT SCOOL
1998 – 2004
Odesa National University - Master of Science - Computer Networks and Systems

COURCES
2022 - DevOps01 - cources
2021 - Web Academy - DevOps for SysAdmins

EXPERIENCE

Site Reliability Engineer - NuxGame
Mar 2025 – May 2025

• Reviewed existing APM setup and provided recommendations for improved monitoring coverage and alerting.
• Integrated Falco runtime security with Wazuh SIEM for enhanced container-level threat detection.
• Updated and maintained a self-hosted Sentry instance for improved application error tracking.
• Instrumented Kubernetes clusters with NewRelic for real-time monitoring and observability.
• Implemented secret scanning using TruffleHog to strengthen security posture.
• Contributed to automation via Ansible roles for SSH key management and Wazuh agent deployment.
• Worked within a complex hybrid cloud environment: AWS (EKS, EC2, Aurora, S3, Route53, etc.), Hetzner (bare metal, K8s dev clusters), Cloudflare
• Used diverse IaC and CI/CD tools, including Terraform, Cluster.dev, FluxCD, Jenkins, and GitLab Actions.

DevOps Engeeneer - Dataweb Global
Nov 2023 - Dec 2024

• Designed and implemented CI/CD pipelines using tools such as Ansible, Git, and Bash scripting to automate software delivery.
• Containerize applications written in Node.js , Go , Ruby and Python , deploying them to Kubernetes clusters.
• Adopted GitOps methodologies using ArgoCD for efficient and declarative application deployments.
• Configured and optimized monitoring systems with Zabbix , Prometheus , and Grafana , including integration between platforms for unified monitoring.
• Deployed and maintained observability stacks ( EFK Stack : Elasticsearch , FluentBit , Kibana ) to enhance log management and system observability.
• Provided support for both internal teams and DaaS clients, ensuring smooth operations and issue resolution.
• Successfully executed a zero-downtime domain migration for a critical DaaS client, minimizing impact on operations.
• Contributed enhancements to the zabbix-csv-host-import- module, with improvements accepted and merged into the main project.

Linux\Windows Administrator - NDA (Startup in gamin AI Sphere)
Jul 2021 – Nov 2023

• Managed and automated a ~500 Linux and Windows servers, ensuring high availability and performance.
• Developed automation scripts using Bash and PowerShell to streamline routine tasks.
• Created and maintained Ansible Playbooks for configuration management and deployment automation.
• Managed and optimized Docker containers for application deployment and scalability.
• Administered self-hosted platforms such as GitLab , Jira , and Confluence , ensuring system stability and user accessibility.
• Maintained and secured network connectivity using WireGuard VPN , Cisco ASA, and Fortinet hardware and software solutions.
• Automated and supported VMware vSAN clusters, enhancing virtualization performance and reliability.
• Implemented Zabbix monitoring with integrated Telegram alerting for proactive incident response and system oversight.
• Acted as Database Administrator (DBA) for MySQL and PostgreSQL databases: performed installation, tuning, backups, and performance optimization.

PREVIOS WORK EXPERIENCE

2016-2023 - TechnoYug – CIO
2015-2016 - Kraina Igrashok – CIO
2014-2015 - Adept Group – CIO
2006-2014 - Kritex-Service – SysAdmin, CIO

SKILLS

CI\CD: GitLab CI, ArgoCD, FluxCD, GitHub Actions, Jenkins
IaC: Terraform, Teragrunt, Hashicorp Vault, Ansible, molecula
LB: AWS ALB, Traefik, nginx, HAProxy, Kong Gateway, Istio Containers : Docker, Cri-O, Docker Swarm, Kubernetes, k8s, Docker-compose
Clouds : Amazon Web Services, AWS (EC2, S3, ECS EKS etc)
Programming, scripting : Python, PHP, Delphi, bash and PowerShell scripting
VMs: VMware ESXi, VMware vSan, Proxmox, LXC, Microsoft HyperV
Monitoring : Zabbix, Prometheus and Grafana, ELK, Fluent-Bit, NewRelic, LGTM Stack
DB: AWS Aurora, RDS, MySQL, MariaDB, Postgres, ProxySQL, Patroni Operating Systems : Linux, Windows
Collaboration: Jira, Confluence, Youtrack, WikiJS, Trello, Git, GitHub, GitLab, Slack, ClickUp

CONTACT

🏠 Romania, Brasov
📧 [email protected]
📧 [email protected]
📱 +380 (95) 279 1125
📱 +4 (074) 149 75 36
🌐 LinkedIn
🌐 GitHub

LANGUAGES

English (B 1 - 2 ), Ukrainian (native), Russian (native)