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Hire the best Firewall Developers in Serbia

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  • $40 hourly

    • 5.0/5
    • (124 jobs)
    I have 30+ years experience in network projects including design, implementation, system administration and in software development. For the first 5 years of my career I worked on software development: coding and especially testing. For the last 28 years I'm working on implementation and maintenance of University of Nis WAN. Last 25 years I'm deeply involved in AMRES (Academic Network of Serbia) project. Don't fix it if it ain't broken, don't break it if you can't fix it! SKILLS SUMMARY - Any system administration tasks - Operating Systems: any *nix (Linux, FreeBSD, SGI IRIX, SCO, Solaris, OSX), Windows 3.1/9x/Me/XP/Vista/W7/W8/W10, WinServer NT/2K/2003/2008/2012/2016 - LAN & WAN: Ethernet, Fast Ethernet, Gigabit Ethernet, FDDI and Wireless LANs. T1/T3, SDH/SONET, Frame Relay, WDM, ISDN, ADSL, SHDSL, Cable Modems, Cellular, X.25. - Network Protocols: TCP/IP, IPv6, UDP, OSI, CDP, IP Multicast, IPSec, VoIP, Routing, VLANs, Bridging, Trunking, VPN, SNA, DLS - Network Services & servers: SMTP/POP3/IMAP, FTP/SFTP, Telnet/SSH, HTTP/HTTPS, DNS, DHCP, NNTP, NTP, LDAP, SNMP, NETBIOS, Apache, Nginx, MySQL, Plesk, cPanel, Zimbra, VMware, CentOS, Ubuntu, Debian - Network Equipment: various types of modems, firewalls, switches and routers. - Dedicated, VPS and cloud environment servers (Amazon AWS, Google Cloud, MS Azure, Digital Ocean, Linode). - Programming Languages: Unix Shell scripting, BASH, C, Pascal, MS Visual Basic, PHP, HTML, (a bit of Python).
    Featured Skill Firewall
    CentOS
    Ubuntu
    System Administration
    Apache Administration
    SSL
    Let's Encrypt
    Linux System Administration
    Red Hat Administration
    Internet Security
    Cloudflare
    Zimbra Administration
    Unix System Administration
    Network Security
    Network Administration
  • $60 hourly

    • 4.9/5
    • (347 jobs)
    Skilled System Administrator and Network Engineer with over 20 years of hands-on experience, adept at organizing networks for single-office environments or multiple offices connected via VPN. I am highly proficient in Unix system administration (Linux and FreeBSD), covering DNS, DHCP, LAMP/LEMP, FTP, SMTP, SNMP, ACLs, firewalls, and NAT, BGP. My expertise also extends to major cloud platforms (AWS, Vultr, DigitalOcean) and virtualization technologies (vSphere, Hyper-V, Proxmox), as well as monitoring tools (Zabbix) and VoIP/IP telephony systems (Asterisk, FreePBX). Here is what past clients have said about my work: - “Pavel was fantastic! My project hit a snag and I needed an FTP server configured quickly. He jumped in immediately, resolved the issue in no time, and answered all my questions in a friendly manner. This guy is a real problem solver!” - “Very smart when it comes to Linux systems—was able to help with our issue.” - “A very skilled and professional expert who solved all additional and unexpected problems with patience. He overdelivered, and I highly recommend working with him!” - “The problem was solved quickly and efficiently.” - “Pavel did a great job tracing the problem and solving it.” - “Pleasure to work with.” I take pride in my ability to quickly diagnose issues, implement reliable solutions, and consistently exceed client expectations.
    Featured Skill Firewall
    Asterisk
    DNSsec
    WordPress
    Linux System Administration
    Apache Administration
    MySQL
    LAN Administration
    Session Initiation Protocol
    Squid
    Web Hosting
    Network Engineering
    VMware vSphere
    NGINX
  • $40 hourly

    • 0.0/5
    • (1 job)
    Highly experienced systems engineer/administrator with more than 15 years in the industry. Been working in small start-ups and large corporations for most of the career. Highly experienced in Microsoft products ranging from client OSs to full server deployments. Also been responsible for active production systems based on CentOS and Ubuntu platforms. Proficient in Azure cloud platform, holder of certifications: Azure administrator (AZ-104) Azure DevOps Engineer Expert (AZ-400)
    Featured Skill Firewall
    Hardware Troubleshooting
    Network Administration
    Red Hat Enterprise Linux
    Microsoft Certified Professional
    Technical Project Management
    Computer
    Microsoft Server
    Linux System Administration
    Linux
    System Administration
    Microsoft Windows
    Microsoft Azure
    Microsoft Exchange Server
  • $30 hourly

    • 5.0/5
    • (182 jobs)
    Linux Server Administrator with expert level experience with 1) Cloud servers setup ( setup new servers, migration of existing to cloud, migration from on cloud to another) 2) Setup application on servers, performance tuning of application & server (Apache, Nginx) 3) Security, server hardening, vulnerability resolutions 4) Working on unmanaged servers & Control panel servers ( WHM/CPanel, Direct Admin, Plesk panel, ispconfig) 5) Setup monitoring & backup servers (Nagios, Netdata, Prometheus, Check_MK, R1Soft, Borg) 6) Troubleshooting of Linux Servers issue, Mail servers, SSL installation, Other Linux installation and configuration. 7) Expert in management of cloud servers and migration of VPS 8) Proxmox (KVM) solution for virtualization I currently working as a Linux system administrator. Administering Linux operating system, web server, backup server and VPS server is my speciality. Professionally deal with computers for more than 15 years. 10 years proffessional experinece as an IT technician in charge of the hardware within pc computers, servers and networking equipment. I always try to the client is satisfied. I accept every job seriously and responsibly ends. 100% Client satisfied, that's my motto.
    Featured Skill Firewall
    Web Hosting
    Email Deliverability
    MySQL
    Hardware Troubleshooting
    cPanel
    Virtual Private Server
    Linux System Administration
    SSL
    Plesk
    System Administration
    Ubuntu
    Linux
  • $30 hourly

    • 3.2/5
    • (0 jobs)
    Hell0! I have been working in the army since 2006. year on ICT positions. I am tech savvy, with ability to quickly learn and apply new technologies. Seek answers to questions, personally without needing excessive guidance. Communicative, charismatic, responsible and reliable person ready for teamwork. Currently I am working as a Senior System and Network Engineer and Consultant. I am MSc in IT, but I also completed and attended several courses in various IT fields (Windows server, Linux, ISO 27001, CISSP, CompTIA CySA+, Network Security, Network Traffic Analyzes, OSCP). I was certified CCNA, CiSCO CyberOps and CompTIA Security+. Skills: - Implement and support highly available, on-prem virtualized (VMware) Windows/Linux, - Create and maintain a patch management strategy, tools and methods to maintain a secure computing environment, - Creates software metering/usage reports to maintain license compliance across all systems, - Ensure configuration consistency across data centres, - Establishing and performing planned maintenance activities, - Work as technical liaison between management, employees, vendors, support, and consultants - Writing and keeping up to date technical documentation and procedures. - Data collection and processing, data structuring and analysis, - Creating databases, - Develop and maintain web sites. - English language – Independent user (B2); - VMware - Excellent; - Computing & Networking- Excellent; - Microsoft Windows Servers Administration - Excellent; - Microsoft IIS - Excellent; - Linux System Administration - Excellent; - Network Administration - Excellent; - Ci/CD - Excellent; - Docker - Excellent; - Kubernetes - Excellent; - Azure - Excellent; - GitLab - Excellent; - KVM, ProxMox - Excellent; - Working with: QRadar, pfSense, robocopy, glusterFS... - SIEM custom solutions - Excellent.
    Featured Skill Firewall
    System Security
    Multiple Email Account Management
    CompTIA
    Cisco Certified Network Associate
    ISO 27001
    Ethical Hacking
    SQL
    Windows Administration
    Security Infrastructure
    Network Monitoring
    Network Security
    Linux
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