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🚀 DevOps & Infrastructure Engineer | 10+ Years Experience Build secure, scalable, and high-availability systems that cut deployment times, reduce costs, and improve reliability. With deep expertise in AWS, Red Hat OpenShift, Docker/Podman, Ansible, FreePBX , FreeSwitch and Linux administration, I’ve delivered production-grade solutions for fintech, hosting, telecom, and enterprise clients worldwide. ✅ What I bring to your project: Cloud Infrastructure & Automation: AWS, Azure, GCP, Ansible, CI/CD pipelines Containerization & Microservices: OpenShift, Podman, Docker, Kubernetes Monitoring & Reliability: Prometheus, Grafana, Loki, EFK stack Security & Compliance: SOC 2 alignment, DevSecOps practices Database & Networking: PostgreSQL, MySQL, HAProxy, load balancing, AMQ Telecom Domain : FreePBX , FreeSwitch 💡 I’ve led projects that achieved 99.95% uptime, reduced vulnerabilities by 60%, and cut provisioning effort by 70%. Whether you need infrastructure design, automation, or ongoing reliability support, I can help you deliver results faster and safer. Let’s discuss how I can help your project succeed.

I'm expert in Microsoft Sentinel & ELK stack & also in Wazuh Siem tools. I'm done server security audit and also developed my own Siem tools for finding vulnerability loophole in Linux and Windows operating system and also prevent intrusion from unknown attacker in cyber field. I can configure DNS,DHCP,FTP and Mail server. I can also configure Mikrotik Router. I have advanced knowledge in python programming & also Java programming. I'm done data analysis and data visualization by python programming. I have advanced knowledge in SAP ERP Software. I'm expert of Database Administration in MSSQL, PostgreSQL, MySQL

As a highly skilled and experienced professional with over 08+ years of expertise, I hold notable certifications such as CCNP, CCNA, RHCE, and Certified Ethical Hacker (CEH) . I have established myself as an accomplished network, system, and security engineer, capable of delivering complete solutions for designing, configuring, automating, and managing network and system projects. My proficiency in using simulation software such as Packet Tracer and GNS3, as well as real-life network and system devices, make me a valuable asset for any project. My few hands-on experiences is: ⭐Network Design by MS Visio, Cisco packet tracer, GNS3, and EVE-NG ⭐Netacad CCNA and CCNP packet tracer Labs activities, projects design and solution ⭐ Expert in configuring, managing, and troubleshooting Cisco routers, switches, FTD, FMC, and ASA firewalls. ⭐ Expert in configuring, managing, and troubleshooting Fortigate, Sophos, Check Point, SonicWall, Palo Alto, pfSense, OPNsense & Huawei firewalls, ⭐Netgear, Huawei, Aruba switch, DrayTek router, TP-Link and others vendor wireless router configurations. ✅Cisco, Tp-Link, Aruba, Fortinet, Ubiquiti, Planet, Huwei switch configurations. ⭐Proficient in configuring, managing, and troubleshooting Unifi Enterprise Fortress Gateway, UDM Pro, Unifi Cloudkey, USG UniFi Firewall , Security Gateway, Switch, and AP devices. ⭐Expert in Linux administration, with expertise in Ubuntu, Red Hat, openSuse, CentOS, Debian, and Kali Linux distributions. ⭐Expert in Windows server administration , Active Directory management, Exchange Server administration, DNS configuration, DHCP implementation, and Windows operating system support. ⭐Experienced in managing and configuring virtualization platforms including HYPER-V, VMware ESXi, VMware Workstation, KVM, VirtualBox, and Proxmox. ⭐Servers: HP Proliant Servers, Dell/EMC Servers, IBM ⭐MikroTik Routers configuration ✅ Cloud Administrator: Azure, AMAZON AWS , Google GCP, OVH and Digital Ocean ⭐VLSM/subnetting of small to large enterprises ⭐VLANs, Inter-VLAN routing, VTP, CDP, Ether-Channel(LACP, PAGP), Spanning Tree (STP, PVST++, MSTP), and FHRP Protocols ⭐IPV4 & IPV6 IP planning, DHCP, NAT/PAT configuration and IP helper address ⭐static and Dynamic Routing protocols (RIP, OSPF, EIGRP, BGP) configuration ⭐Layer-3 Redudent/backup links Using HSRP, VRRP ⭐Port security, ACL( access list) configuration ⭐Network troubleshooting and optimization ⭐VPN Configuration Expert (GRE , SSL, IPSEC, PPTP, OPENVPN , wireguard & DMVPN) ⭐Advanced Excel skills, including macro, VBA, VLOOKUP, and other automation techniques ⭐Network automation script for any cisco and fortigate devices using python ⭐ Skilled in automation using Bash/Shell scripting ✅Overlay Networks VPN Expertise: Proficient in configuring and managing various overlay network VPNs, including ZeroTier, Tailscale, WireGuard, SoftEther VPN, Netbird , Netmaker, OpenVPN Cloud, I, Twingate and PeerVPN for secure, scalable, and decentralized networking, enabling seamless remote access, team collaboration, and encrypted communications across distributed systems. ✅Beryl AX and Flint Router Configuration Expert ( Mini Router, Travel Router, Home Wi-Fi, cellular Router) like GL-MT6000, GL-AXT1800, GL-MT3000, GL-A1300 etc ✅Cisco Duo: MFA, 2FA, SSO, Identity Security Integration, Windows Logon, RDP, Microsoft AD, VPN Authentication.

Hi, I am Sazedur Rahman, working as a System Engineer for Linux/Unix-like OS Based Systems in a Reputed Financial Organization. I am new to Upwork but have more than five years of profound Experience in Linux/Unix System Administration, Configuration, Server Security and Automation. Completed various Live projects such as Authoritative DNS, DNSsec, Caching DNS, Zimbra Multi-Server Mail Solution, Multiple Web Server using Apache and NGINX, Local Repository for Linux Distributions Like- CentOS/Ubuntu & EPEL/Zimbra/RemiPHP, File Server Integrated with Windows AD for more than 8K Users, IPA Server, NTP Server, Cockpit Server, Secure File Sharing with Next Cloud. Expertise in - Linux Server Configuration- Web, Mail, DNS, Virtual Hosting, Samba, NFS, FTP, HA Cluster, Apache/NGINX with SSL/TLS, Gluster Storage (GFS2), Zimbra Mail Server, Red Hat Satellite, Spacewalk (open-source systems management), Linux System Security - Firewalld, iptables, fail2ban System Automation using- Shell Scripting, Ansible, Python Linux System Penetration Testing using OpenSCAP. Virtualization- vmware, rhev, kvm Kubernetes, Docker, Container Also certified as CCNA, RHCE, RHCVA & RHCA (Red Hat Cert ID: 160-039-582).

* Over 5 years of On-prem work experience in TIER III datacenter * Over 3 years of Public/ Private Cloud work experience. * Cloud VM/ EC2 instances with proper networking and storage. * Windows Server with Roles and Features * Linux server OS with Mail, Web, FTP, EMAIL, DNS, DHCP, YUM, Cacti, Nagios services. * Switching: Cisco, Juniper, BDCOM, Quanta, Huawei etc * Routing: Cisco, Juniper, MikroTik, vyOS etc * Firewalls: FortiGate, PaloAlto, Juniper SRX, MikroTik, pfSense etc, * Wifi: Cambium, Ubiquiti, TP-Link, D-Link Tenda, Netgear etc * Security: WAF, Site-to-site VPN, Remote Access VPN, OpenVPN, PCI-DSS, OpenSCAP etc * Monitoring and troubleshooting of various services. Professional Experiences: * Currently working as an Assistant Manager (Systems ) at a well-reputed Data Center company doing Typical Level 3 / Core infra and system-related tasks. Professional Certifications: * Red Hat' RHCE, RHCSA * Microsoft' MCSA, Azure Administrator Associate (Az-104) * Cisco' CCNA * MikroTiks MTCNA * WHM & cPanel' CWSA also participated in Certified Ethical Hacker (CEHv9) course for cybersecurity skills. Skills haven't mentioned: * Implementing technologies protocol like VXLAN, VLANs, STP, RSTP, PVST+, inter-VLAN, SSH, IGRPv2, DHCP, OSPFv2, BGP, etc. * Providing offensive securities like HTTPS, SSL, Captcha Authentication, 2FA Authentication, DDos protection, CSRF protection, inbound/outbound email protection, etc. * Designing infrastructures in Microsoft VISIO for better security and compliance. Academic Qualification: * B.Sc. in Electrical and Electronic Engineering (EEE) at Daffodil International University. Please consider inviting me to apply for your job so that we can continue working together. Best Regards, Md Jan A Alom Beg

I am a Linux & Windows System Administrator and DevOps Engineer with over 8 years of experience, specializing in server management, automation, and cloud infrastructure. I help businesses maintain secure, high-performance, and scalable IT environments. My expertise includes: ✔ Linux & Windows Server Administration: Linux: Debian, CentOS, Ubuntu, RHEL – maintenance, troubleshooting, and optimization. Windows Server: Active Directory, Group Policy, IIS, Remote Desktop Services, DNS, DHCP, and PowerShell automation. ✔ DevOps & Automation: CI/CD pipelines, Ansible, Docker, Kubernetes, Terraform, Jenkins, and GitLab CI/CD. ✔ Cloud & Virtualization: AWS, Google Cloud, DigitalOcean, Azure, VMware, and KVM-based solutions. ✔ Web Servers & Performance Tuning: Apache, Nginx (with PHP-FPM/FastCGI), MySQL, Varnish, Memcached. ✔ Odoo ERP: Deployment, configuration, maintenance, and troubleshooting. ✔ Networking & Security: iptables, rsync, BIND, OpenVPN, Windows Firewall, network troubleshooting. ✔ Email Servers & Deliverability: Exim, Dovecot, Postfix, Microsoft Exchange, MailEnable – setup and troubleshooting. ✔ Backup & Migration: Secure and seamless server, database, and email migration. ✔ Control Panels: WHM/cPanel, Virtualmin, Plesk – installation and management. ✔ Monitoring & Logging: Zabbix, Munin, Nagios, ELK Stack (Elasticsearch, Logstash, Kibana), Windows Event Viewer. ✔ Lost Data Recovery: Helping recover critical data from both Linux & Windows environments. I am committed to providing secure, efficient, and scalable solutions for businesses. If you need assistance with server management, DevOps automation, Windows/Linux support, or performance optimization, feel free to reach out!