Oleksandr Molnar

DevOps · System & Network Administration

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172
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DevOps / Infrastructure Engineer with practical experience in Linux administration, Docker, Docker Compose, CI/CD, GitLab, GitHub, cloud infrastructure, reverse proxy, DNS, SSL/TLS, monitoring, networking, and deployment automation. My strongest background is in Linux-based infrastructure, containerized services, self-hosted environments, CI/CD automation, network troubleshooting, and service reliability. I have built and maintained deployment workflows: GitLab CI/CD → Docker image build → push to private container registry → deploy via SSH to Linux VM → service restart/update. Practical cloud…
Vasyl

Audio & Video Editing · System & Network Administration

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204
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I am a Senior DevOps & Infrastructure Engineer with 8+ years of experience designing, automating, and securing high-load IT environments. My current focus is AI/MLOps, where I build autonomous, air-gapped infrastructures for LLMs with strict defense-grade security protocols. I bridge the gap between heavy AI workloads and optimal hardware utilization, ensuring maximum performance for mission-critical systems. I am passionate about eliminating manual work through automation, reducing downtime, and building zero-trust networks. Key Impact & Achievements: AI Infrastructure: Designed and deployed…
Oleksandr Meleshchuk

System & Network Administration · DevOps

0 0
184
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- Development, design, maintenance of the computer networks, computer equipment, network services, improvement and analysis of existing network, server, and service infrastructure; - Users’ technical and software support; - Setting up and maintaining Microsoft based operation systems WinXX, Windows Server 20XX; - Setting up and maintaining Linux based operation systems Debian, Ubuntu, CentOS, and Unix-like FreeBSD; - Administration of the: MTA(Dovecot, Postfix, Exim4, MS Exchange Server), FTP, SQL(MS SQL, MySQL, PostgreSQL, MongoDB), LAMP(Apache, Nginx, PHP), HAProxy, DNS, DHCP, NPS, DFS,…
Roman Pavlovsky

Software & Server Configuration · System & Network Administration

23 1
5.0
525
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Senior Linux System Administrator / Infrastructure Engineer Linux • Apache • Nginx • PHP • MySQL • Docker • Proxmox • VPN • VoIP === Senior Linux System Administrator with 15+ years of experience working with Linux servers, networks, VoIP and web infrastructure. Experience supporting high-load web projects, Asterisk/Vicidial, VPN, hosting and corporate systems, call centers, as well as freelance projects for small and medium businesses, setting up comprehensive monitoring, optimizing security through Cloudflare and automating backups, supporting technical documentation. === Key competencies…
Data backup
11 USD
188
Data backup
System & Network Administration
The service includes: - Data backup to cloud storage - Access to your files to view, delete and restore data - Data storage space size from 10 GB to 1000 GB The service does not include: - Integrity check of each backup copy. Control of the…
Zabbix Monitoring System
17 USD
243
Zabbix Monitoring System
System & Network Administration
The service includes: - Installation and initial setup of the monitoring system - Discussion of technical specifications for setting up detailed monitoring - Setup on your server or use of our monitoring system for your services The service…
Video surveillance settings
11 USD
150
Video surveillance settings
System & Network Administration
The service includes: Configuration of DVRs and IP cameras: Dahua Hikvision CoviSecurity Update of firmware of DVRs and IP cameras #hikvision #DAHUA #CoviSecurity #videomonitoring
Vladyslav

System & Network Administration · Software & Server Configuration

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222
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I specialize in Linux system administration and security with a focus on stability, access control, and minimizing the attack surface. I work primarily with Ubuntu Server and FreeBSD, providing full server setup, configuration optimization, and basic security hardening. Core areas of expertise: • VPS deployment and configuration • Firewall setup (UFW, iptables, pf) • NAT and traffic filtering rules • VPN deployment (WireGuard, OpenVPN) • SSH hardening (key-based authentication, access restrictions) • Basic Linux security audits • Service isolation (FreeBSD jail) • Open port and service…
Setting up a secure Ubuntu Server (SSH, UFW, IP restrictions)
45 USD
117
Setting up a secure Ubuntu Server (SSH, UFW, IP restrictions)
System & Network Administration
Basic security hardening of Ubuntu Server has been performed in a test environment. Implemented: • Full system update • Creation of a separate administrative user • Configuration of SSH access exclusively by keys • Disabling password authentication…
Roman Zhelnov

System & Network Administration · Text Editing & Proofreading

0 0
218
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I am a Junior Frontend Developer with basic programming skills. I am responsible, adaptable and motivated to develop in the field of web programming. I am looking for a team where I can apply my knowledge and skills to solve problems.