Hire the Best Network Engineers
in Ukraine

- Knowledge of principles of construction and operation of computer networks, application protocols. - Professional knowledge of operating systems Linux, FreeBSD, Windows, customization of servers for various tasks. - Knowledge and understanding of virtualization environments. - Perfectly mastered technologies of remote configuration and administration of objects, networks, servers, workstations, combining geographically dispersed objects in local networks. - Knowledge of computer and telecommunication equipment.

⭐️ Top Rated Plus - Top 3% Expert on Upwork 🕒 9000+ Working Hours ✅ 20+ Years of Expertise ✅ 100% Job Success ✅ 300+ Successful Projects Finished ✅ 5 Star Rating Hello, I'm Oleksandr. As a seasoned Linux System Administrator and DevOps Engineer with over 20 years of experience I specialize in delivering robust IT solutions that enhance operational efficiency and security. My expertise spans across various domains, including: ▪ DevOps & Automation: Successfully implemented automated provisioning using Ansible, streamlining deployment processes and reducing manual intervention. ▪ Linux & FreeBSD Maintenance: Managed and optimized server environments on CentOS, Debian, Ubuntu, RHEL, and FreeBSD, ensuring high availability and performance. ▪ Cloud Hosting: Deployed and maintained scalable cloud solutions on AWS, Azure, and DigitalOcean, enhancing infrastructure reliability and scalability. ▪ Virtualization: Utilized Docker, VirtualBox, and OpenVZ to create flexible and efficient virtual environments, supporting diverse application needs. ▪ Web & Database Servers: Configured and maintained Apache, Nginx, MySQL, PostgreSQL, and MongoDB servers, ensuring secure and efficient data handling. ▪ Networking & Security: Implemented secure networking solutions, including VPNs and firewalls, to protect sensitive data and maintain network integrity. I am committed to continuous improvement and staying abreast of the latest industry trends. My approach is rooted in ITIL best practices, ensuring incident management and business continuity planning are at the forefront of my work. Let's collaborate to drive your IT projects to success with innovative solutions and expert guidance.

At Roobykon Software, I specialize in automating, scaling, and optimizing infrastructure and development workflows to help our clients achieve efficient, reliable software delivery. With over 10 years of hands-on experience as a Senior DevOps Specialist, I ensure robust integration and scalable operational environments for every project. Our team is dedicated to empowering companies to build and grow their marketplace businesses with cutting-edge DevOps solutions. 🏆 Area of expertise: • E-commerce (including multi-vendor marketplaces and product/service platforms) • FinTech (payment gateways, escrow systems, and custom financial solutions) • CRM Systems (tailored customer relationship management platforms) • Logistics (marketplaces for delivery, warehousing, and transportation) • Marketplace Development (B2B, B2C, peer-to-peer, product, service, and rental-based platforms using Sharetribe and custom-built solutions) • Travel and Tourism (booking platforms for accommodations, experiences, and tours) • Car Rent and Rental Websites (multi-vendor vehicle rental platforms) • Retail (multi-vendor e-commerce platforms, digital storefronts) • Construction and Real Estate (property listing marketplaces, contractor bidding platforms) • Aviation (charter services, private jet booking platforms) and boat rental (yacht, boats, jet ski) • Entertainment and Social Networking (event booking, ticketing, and social interaction platforms) • Marketing and Advertising (customized marketplaces for ad placements, influencer marketing platforms) • Insurance (platforms for comparing and purchasing insurance policies) • Industrial (B2B marketplaces for industrial goods and services) • Marketplaces for hospitality services, catering, and restaurant supplies • Mental Health and Healthcare (platforms for telemedicine, therapy services, healthcare provider listings) • Management (resource management platforms for HR, procurement, and project collaboration) Got an idea but unsure how to make it happen? We’ll provide tailored solutions to fit any budget and ensure everything is ready to go. With every project, we work as if it’s our own, always prioritizing your success. Buzzwords: Automation Continuous Integration Continuous Deployment (CI/CD) Infrastructure as Code (IaC) Microservices Orchestration Docker Kubernetes Monitoring Logging Containerization Scalability Load Balancing High Availability Disaster Recovery Fault Tolerance Infrastructure Automation Blue-Green Deployment Canary Deployment DevSecOps Secrets Management Immutable Infrastructure Jenkins Ansible Terraform GitOps Incident Management Rollback Auto-scaling EC2 S3 Lambda RDS Elastic Beanstalk CloudFormation ECS Fargate EKS Route 53 CloudWatch IAM SQS SNS CloudFront VPC Elastic Load Balancer (ELB) Redshift DynamoDB AWS Backup AWS CLI CloudTrail Security Groups DNS Management SSL Certificates Hosting Control Panel Domain Management Website Security cPanel Website Backup GoDaddy API Dynos Heroku Pipelines Add-ons Heroku Postgres Heroku Redis Heroku CLI Automated Deployments Buildpacks Git-based Deployments Jenkins CircleCI GitLab CI GitHub Actions Travis CI Pipeline Automation Continuous Testing Continuous Delivery Code Coverage Artifacts Rollbacks Webhooks Build Automation Docker Integration Deployment Automation Serverless Architecture Cloud Infrastructure Virtual Machines (VMs) Networking Configuration Load Balancers Storage Solutions Infrastructure Scaling VPC (Virtual Private Cloud) Network Security Monitoring Infrastructure as Code (IaC) Infrastructure Optimization Marketplace Development Multi-vendor Marketplace Sharetribe Go Sharetribe Flex Custom Marketplace Development Payment Gateway Integration Marketplace Scalability Sharetribe API Marketplace UX/UI Sharetribe Deployment MVC Architecture ActiveRecord Gem Bundler Action Cable RESTful APIs Convention over Configuration Rails Engines Active Job WebSocket Support Background Jobs TDD (Test-driven Development) Sharetribe Customization Sharetribe Expert Sharetribe Flex Sharetribe Go Sharetribe Expert Sharetribe Flex Developer Sharetribe Go Developer New Sharetribe

I am a Senior DevOps Engineer with 9 years of experience in System Administration, Networking and DevOps areas. Have hands-on experience with migration and building infrastructure in clouds (Azure, AWS, GCP). Can help in providing micro-services based on Kubernetes and Docker. If you are looking for a DevOps to deploy your code or maintain the infrastructure you can count on me. Certification: - Certified Kubernetes Administrator (CKA) - Cisco Certified Network Associate (CCNA) Core Qualifications: - Clouds: Amazon Web Services (AWS), Azure, GCP - Containers: Kubernetes, CoreOS, Docker - CI/CD: Jenkins, VSTS, FluxCD, AgroCD - Networking: Routing, switching, VoIP, virtual networking - Hypervisors: VMware, Hyper-V - Automation: Ansible, AWS CloudFormation, Terraform - Databases: Mysql (Galera), PostgreSQL - Logging: Fluentd, Logstash, Elasticsearch, Kibana - Monitoring: Zabbix, Grafana, Prometheus - VPN: OpenVPN, IPsec. - Web: LAMP, Nginx

Hi, I'm Vitalii — your future WordPress partner! 🚀 With 5+ years of experience and over 100 websites built for clients worldwide, I know exactly how to turn your ideas into high-performing websites. Whether you need a corporate site, blog, landing page, or online store, I deliver pixel-perfect, fast, and fully responsive projects — using Elementor, Elementor Pro, or even clean custom WordPress development (no builders needed!). 🔹 Strong expertise with Crocoblock plugins — dynamic listings, filters, directories, custom post types with JetEngine, JetElements, JetSmartFilters, and more. 🔹 Flexible approach — ready-made themes or custom designs tailored to your goals. 🔹 Smooth experience — I always provide a short video guide after launch and ongoing support even after the project is finished. No templates. No headaches. Just a website that grows your business and impresses your visitors. Let’s build something amazing together!

Hi! I'm a Cybersecurity Engineer with hands-on experience in vulnerability assessments, cloud security reviews, and compliance evidence gathering. My main responcibility is to make clients understand and improve their security posture. I work across the full assessment lifecycle: scanning exposed services, reviewing configurations, validating findings, and delivering clear, actionable remediation reports that your clients can actually use. I'm comfortable operating under NDA and have supported multiple audit during my experience in fintech sector, so I understand the discipline and documentation standards that consulting engagements demand. What I can do: - Conduct vulnerability assessments using Burpsuite Scanner, OpenVAS, Nmap, Acunetix from scoping through validated findings - Review exposed services, firewall configurations, and network infrastructure for security gaps - Perform Microsoft 365 security reviews - Azure security posture analysis aligned with CIS benchmarks and Microsoft Secure Score - Gather and structure technical evidence for compliance projects (PCI DSS, ISO 27001) - Produce detailed, structured remediation reports tailored to any environments Relevant experience: - Conducted web penetration tests using OpenVAS, Burp Suite, OWASP ZAP, and Metasploit - Provided technical evidence and documentation support for internal audits and certifications - Performed risk assessments and security hardening for infrastructure and information systems - Wrote security policies, remediation playbooks, and technical process documentation Understanding of frameworks & certificates: PCI DSS ISO 27001 CIS Benchmarks Tech stack: OS : Linux (Red Hat, Ubuntu), Windows (desktop & server), macOS VM : VMware, VBox SIEM : ELK/Wazuh, ArcSight, Splunk Cloud : Azure, Entra ID, Defender Network : Fortinet IPS&Firewall, Check Point Firewall, F5 WAF Anti-DDoS : Radware, Arbor EDR : Elastic Agent, Trellix PAM : CyberArk NDR : Vectra Vulnerability Detection : Nmap, Metasploit, Burp Suite + Scanner, OWASP ZAP, OpenVAS, Harvester, Sublister, Maltego