Hire the Best Nagios Specialists
in Ukraine

Linux/Unix Systems, Internet Protocol Suite (TCP/IP), OSI, Virtualization systems(VM Ware/Vsphere/Vbox). A high level of knowledge in building a VPN(IPSEC/SSL VPN/GRE), configuring routing(OSPF/BGP), and creating a fault-tolerant network that can remain operational in case of problems. Experience in configuring and maintaining equipment: Juniper, Cisco, Fortinet, MikroTik, D-link, Teltonika. Monitoring and administrating monitoring system (Nagios, Grafana, Kibana, Cacti, Nagvis, Zabbix) Worked in systems for global network management, backup systems. and log analyzers (Cisco Ise/Cisco Prime/Fortimanager/Fortianalizer/Syslog4all/QRADAR). Elaboration of the architecture of network solutions, and the creation of fault-tolerant nodes in the network infrastructure.

## Professional Experience ### DevOps / Infrastructure Engineer Yeesshh 2018 – Present Sole DevOps/SRE responsible for full production infrastructure of ~50 web services and internal systems in digital advertising environment. **Infrastructure:** * 6 dedicated bare-metal servers hosted in OVHcloud * Proxmox single nodes and Proxmox cluster, altogether with ~30 virtual machines * Proxmox Backup Server, Custom NFS-based backup storage * Multi-region deployment (EU + Canada) * Internal VPN via Pritunl * Docker-based service deployments **Reliability & Operations:** * 24/7 on-call (30-minute critical SLA response) * ~99%+ uptime across production systems * Full Proxmox node disaster recovery (including restoration from backups) * Centralized monitoring via Zabbix * Centralized logging via Graylog * Security monitoring via Wazuh * Incident management via PagerDuty * Post-incident reporting and preventive improvements **Security & Compliance:** * DNS management (SPF, DKIM, DMARC) * DDoS mitigation using CSF/LFD, ModSecurity, mod_evasive * PCI compliance validation via Qualys (minimal adjustments required) * Regular patching & monthly backup validation **CI/CD & Automation:** * GitHub repositories * Jenkins pipelines for controlled deployments * Staging → testing → manual production release workflow * Limited Ansible automation (update & small maintenance scripts) **Modernization:** * Legacy OS upgrades * Partial containerization of services * Kubernetes - self-hosted proof-of-concept deployment (non-production) --- ### CloudOps / SysOps Engineer LCloud 2021 – 2023 Worked in AWS Partner environment supporting global enterprise and mid-size clients as L1 support. Environment: Amazon Web Services Responsibilities: * 24/7 production support (L1) * EC2, RDS, S3, IAM troubleshooting * Backup & restore procedures * Log analysis & incident escalation * Execution of infrastructure changes according to documentation * Exposure to IaC-managed environments --- ### Independent Linux Infrastructure Consultant 2012 – 2021 Provided infrastructure and system administration services for up to 100 international clients including web hosting providers. Experience includes: * Web hosting environments (Canada & Italy) * Email servers (Postfix/Exim) * DNS management * CMS deployments (WordPress, Drupal, Joomla) * Monitoring (Nagios, Zabbix) * Virtualization (Proxmox) * Security cleanup & WordPress malware removal * Redmine & GitLab environments --- ### Early Career (Condensed) Senior Linux Administrator – Retail network (250 employees) Network design, Linux desktop environment (60+ machines), POS equipment support, server infrastructure management. Additional system & network administration roles (2007–2012). --- ## Personal Technical Projects * Self-hosted AI workflow automation using n8n * Local LLM experimentation (LLaMA-based models compiled via llama.cpp) * Raspberry Pi lab (media server, backup storage, surveillance systems) * Mobile app development(dart) and backend infrastructure (Dockerized Node.js backend) --- ## Languages Ukrainian – Native Russian – Native English – Professional working Polish – Limited working Spanish - Learning

=> Let's Connect Hello, I'm Dima, a seasoned CyberSecurity Specialist and Turnkey Infrastructure Expert specializing in BigData solutions and data analysis, utilizing a DevOps approach. => Expertise Overview With a robust passion for constructing SOC, SOAR, and SIEM solutions, my primary focus lies in developing data ingestion, enrichment, and analysis pipelines, ensuring they are highly available and fault-tolerant. My expertise extends to building central logging and real-time processing platforms from the ground up, optimizing them for performance, security, and reliability across multiple environments, whether in the cloud or on-premise. => Value Proposition My commitment is to deliver solutions that not only centralize security and threat intelligence but also facilitate enhanced control over data, ultimately contributing to infrastructure cost savings. => Technological Summary CyberSecurity:------- > Wazuh, Suricata, pfSense BigData:--------------- > Kafka, ElasticSearch, OpenSearch Data Processing:----- > FluentD, Vector.dev, Apache NiFi Infra as Code:--------- > Terraform, cdktf, cdk8s Virtualization:--------- > Proxmox, VMware Containerization:----- > Kubernetes Clouds:---------------- > AWS, Hetzner, DigitalOcean, Linode Automation:----------- > Jenkins, GitHub Actions Monitoring:----------- > Zabbix, Grafana, Kibana, Prometheus, Thanos Mail:--------------------> MailCow SMTP/IMAP, Postfix VPN:------------------- > OpenVPN Server Programming:-------- > Bash, Python, TypeScript Operating Systems:- > CentOS, RHEL, Rocky Linux, Ubuntu, Debian => Personal Attributes • Leadership: Leading by example with a team-first approach • End-to-End Execution: Proficient from POC to Enterprise-level implementation • Resilience: Demonstrating high thoroughness and endurance • Adaptability: A quick, can-do architect and experienced troubleshooter • Optimization: Adept in process and performance optimization • Documentation: Skilled technical documentation writer • Vision: A visionary in technological implementation and solution provision

Over 13 years of experience in Enterprise network solutions, design, implementation & Operations. List of solutions experience: A) Routing & Switching: Cisco ISR, ASR(IOS/IOS-XE), Nexus N5K, N7K, C2960, C3650, Catalyst 9K, SG500X, Brocade/Ruckus, HP Mellanox SN2000, QoS, BGP, OSPF, EIGRP, STP, VLAN, VPC B) Networks Security: Cisco FirePower, ASA/FTD, Juniper ISG, Fortigate 501E 201E, FortiAnalyzer/FortiManager, PaloAlto PA-5200, Cisco ISE (Tacacs+ / Radius), SecureWorks, SonicWall, pfsense, Meraki MX, Cisco Umbrella, DUO 2FAC C) Wireless Networks: Cisco WLC 9800 | Cisco 9100 series AP , FlexConnect / Mobility Express, Meraki MR D) Remote Access | VPN: CiscoAnyConnect, Prisma, Zscaler E) Network Performance Optimization: Riverbed Steelhead F) Monitoring: Solarwinds, Nagios, Netscout G) Cloud computing - AWS H) IT service mgmt. | IT vendor mgmt. | IT service delivery mgmt. | Project mgmt. Continuously pushing to leverage technology, and identify better methods to enhance customer experience, and deliver on time with highest quality.

🌐 Professional Cloud Engineer with Over 10 Years of Experience 💼 I am a seasoned Cloud Engineer with deep expertise in Linux, network engineering & administration, system engineering, and DevOps. With over a decade in the field, I bring a comprehensive skill set in system management, virtualization, and cloud infrastructure. 📌 Core Skills and Competencies: ✅ Multi-Cloud Architecture & Migration: AWS, GCP, Digital Ocean, Vultr, Hetzner 🚀 Automated Deployment: Ansible, Terraform 📦 Containerization: Docker, Kubernetes 💻 Scripting & Automation: Bash, Python 🔄 Continuous Integration: GitLab CI, GitHub Actions 🌐 Software (ERP/CRM/CMS): WordPress, Laravel, Joomla ⚙️ Linux Systems Administration: RedHat, Debian, Ubuntu 📊 Database Management: MySQL, MariaDB 📧 Mail Servers: Exim, Postfix, Dovecot, Spamassassin, Roundcube 🔧 Web Servers: Apache, Nginx, Varnish, Memcached, Php-fpm 🛠️ Hosting Panels: cPanel, WHM, Plesk, Webmin, VestaCP, ISPManager 📡 DNS Tools, CDN & WAAP: Cloudflare, Akamai 📈 Monitoring Tools: Zabbix, Cacti, Nagios 🌐 Networking: IP tools, Iptables, OpenVPN ⚠️ Note: Currently, I reside in a city affected by daily shelling. I am not accepting large-scale projects at the moment, but I continue to work and remain connected, supported by a generator, battery backup, and multiple internet providers. 🙏 Take care of yourself and your loved ones, and cherish every moment spent together.

🚀 Scaling issues? Slow queries? Unstable deployments? I help SaaS platforms scale reliably, optimize infrastructure, and deploy with confidence. 📅 20+ years of experience 📦 70+ completed infrastructure & DevOps projects ⚡ Systems handling millions of requests monthly 💰 Helped clients reduce infrastructure costs by up to 45% 🚀 Improved deployment speed by 60% with automated CI/CD pipelines I’m a DevOps Engineer, AWS architect, cloud engineer, and AWS devops specialist focused on building high-performance, scalable cloud infrastructure for SaaS platforms, enterprise systems, and high-load applications. I work with startups and growing businesses to eliminate bottlenecks, optimize databases, stabilize deployments, and improve infrastructure reliability. I have strong hands-on experience with aws, Google Cloud, and Azure environments, including infrastructure automation, monitoring, container orchestration, disaster recovery, and production scaling. I also work as an azure devops engineer, building automated deployment pipelines and improving release workflows for scalable SaaS systems. My background also includes gcp devops environments for cloud-native applications and high-availability infrastructure. 🎯 Database & Performance Expertise I specialize in MySQL, PostgreSQL, MS SQL, MongoDB, Oracle, and high-load database optimization, including: • Query tuning & indexing strategies • Performance optimization • Backup & disaster recovery • Replication & high availability • Oracle RAC & Data Guard • Database scaling & monitoring I’ve optimized systems processing 200K+ events daily while reducing query execution time by up to 70%. 🎯 DevOps, Cloud & Infrastructure As an AWS architect and cloud engineer, I design and manage scalable cloud environments using: • AWS • Azure • Google Cloud • Docker • kubernetes • Terraform • Jenkins • GitHub Actions • GitLab CI/CD • n8n I build secure, automated infrastructure with Infrastructure as Code (Terraform), scalable deployment pipelines, and containerized environments optimized for reliability and performance. I also work with wordpress devops workflows including server optimization, deployment automation, CDN configuration, caching, scaling, and security hardening for high-traffic WordPress platforms. Additionally, I have experience with python devops environments, supporting Python-based APIs, automation systems, backend services, CI/CD workflows, containerization, and cloud deployment pipelines. 💡 What I Can Help You With • AWS devops & cloud infrastructure • CI/CD pipeline setup & automation • Docker & kubernetes orchestration • Infrastructure as Code with Terraform • Monitoring & observability systems • Database optimization & scaling • Backup, recovery & disaster planning • High-load SaaS infrastructure • Linux server administration • Production deployment optimization • Cloud migration & infrastructure modernization 💻 Infrastructure & System Administration • Linux, Unix, Windows Server administration • Oracle, PostgreSQL, MySQL, MongoDB, MSSQL administration • Active Directory setup & maintenance • RDS Apps & VDI environments • Apache, Nginx, CPanel, CentOS environments • Monitoring systems: Zabbix, Nagios, Splunk, Grafana • Cloud services: AWS, Azure, GCP • Kubernetes cluster management • Jenkins & automated deployment workflows • n8n ⚡ Results Delivered • Reduced downtime by 80% through infrastructure hardening • Improved deployment reliability across multiple SaaS products • Reduced cloud costs by 30–45% through infrastructure optimization • Automated CI/CD workflows reducing release cycles from hours to minutes • Built scalable environments supporting 100K+ active users I bridge the gap between infrastructure, backend systems, databases, and cloud architecture — helping teams ship faster while keeping systems stable, scalable, and secure. 👉 If your platform is growing — or struggling under production load — I’ll help you stabilize, optimize, and scale it for long-term reliability and growth. ⚙️ Core Expertise / Keywords AWS Architect, AWS DevOps, Cloud Engineer, Azure DevOps, Azure DevOps Engineer, GCP DevOps, Kubernetes, Terraform, DevOps Engineer, n8n, Docker, AWS, GCP, Cloud Infrastructure, Oracle DBA, PostgreSQL, MySQL, MongoDB, Performance Tuning, Query Optimization, Infrastructure as Code, Jenkins, GitHub Actions, Linux Administration, SaaS Infrastructure, Scalability, High Availability, Monitoring, Automation, Reliability Engineering