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Senior Linux & Cloud Infrastructure Engineer | DevOps | 5+ Years | 100% Job Success I keep production systems up, fast, and secure — so you don't have to think about infrastructure. Currently managing 60+ Linux servers across AWS, Azure, and GCP for enterprise clients, including high-traffic WordPress fleets, educational LMS platforms, and SaaS applications. ━━ WHAT I DELIVER ━━ → WordPress at Scale: GridPane, OpenLiteSpeed, LiteSpeed Enterprise, Cloudflare WAF, CDN optimization — page loads cut from 4s to <1s → Cloud Infrastructure: AWS (EC2, S3, Route 53, IAM), Azure, GCP — architecture, migration, cost optimization → DevOps & CI/CD: Jenkins, GitHub Actions — automated build, test, and deployment pipelines → Infrastructure as Code: Ansible playbooks for provisioning, config management, and compliance automation (DISA STIG, OpenSCAP) → Containers: Docker, Portainer, Docker Compose — multi-container app deployment → Monitoring & Observability: Zabbix, Grafana, Prometheus, Loki — full-stack setup with alerting pipelines across 40+ production servers → Networking & VPN: Tailscale mesh VPN, Cloudflare Tunnels, Nginx/Caddy reverse proxy, pfSense, DNS management at scale → Security & Compliance: ModSecurity, OWASP hardening, DISA STIG, Wazuh SIEM, zero breaches in 5 years → Automation: Ansible, Bash, PowerShell, n8n workflows — eliminated 20+ manual hours/week → Microsoft 365 & Entra ID: full tenant management, MFA, Conditional Access, bulk provisioning → Mail Infrastructure: Postal Mail Server, SendGrid, DKIM/SPF/DMARC from scratch → Virtualization & Homelab: Proxmox, VMware ESXi, PXE boot + autoinstall for zero-touch Ubuntu provisioning, LVM storage, VM lifecycle management ━━ PROVEN RESULTS ━━ ✓ Built Jenkins CI/CD pipeline with Ansible for DISA STIG-compliant Ubuntu server fleet ✓ Deployed PXE autoinstall infrastructure for zero-touch provisioning of 10+ VMs ✓ Migrated 50+ WordPress sites with 100% data integrity and zero downtime ✓ Reduced server response time 40% through OLS tuning + CDN integration ✓ Set up full observability stack (Zabbix + Grafana + Loki) across 40+ production servers ✓ Implemented Tailscale mesh VPN across Proxmox homelab and remote VPS nodes ✓ Configured multi-layered security stack reducing spam/injection by 95% ✓ Automated M365 student provisioning for 3 educational institutions (500+ accounts) ✓ Reduced manual ops overhead 60% through n8n + Bash automation workflows ✓ Deployed automated backup systems saving clients 15+ hours/week ━━ TECHNOLOGY STACK ━━ Cloud: AWS (EC2, S3, IAM, Route 53, CloudWatch) | Azure | GCP On-Prem: Proxmox | VMware ESXi | Hyper-V | Bare Metal (OVH, Contabo, Hetzner) OS: Ubuntu 20/22/24 LTS | Rocky Linux | CentOS | RHEL | Debian Web: Apache | Nginx | LiteSpeed | OpenLiteSpeed Panels: GridPane | cPanel/WHM | Plesk | CyberPanel | aaPanel DB: MySQL | MariaDB | PostgreSQL DevOps: Ansible | Jenkins | GitHub Actions | Bash | PowerShell | n8n Containers: Docker | Portainer | Docker Compose Monitoring: Zabbix | Grafana | Prometheus | Loki | Uptime Kuma Security: Wazuh SIEM | OpenSCAP | ModSecurity | Cloudflare WAF | CSF | Sophos | Fortinet DNS/Mail: Cloudflare | Route 53 | Postal Mail Server | DKIM/SPF/DMARC RMM: Atera | ConnectWise | Datto | N-able I provide detailed documentation for every implementation and respond within 1 minute during business hours Send me your requirements — I'll respond with a tailored plan within 24 hours.

✅ ABOUT ME: I am a Professional Full Time Freelancer. I have 8+ years of experience working on Windows/Linux server administration, CICD Devops ,AWS, Azure, windows/Linux troubleshooting, HyperV, proxmox servers, DNS records mapping, IIS, Domains and DNS records management, active directory, web server, webhosting, databases administrations and Mail server implementations, administrations for the mail services MS Office365, Gsuite, Zimbara and postfix . ✅ WHY ME? • Full-time Professional – I work on Upwork as a full-time freelancer. I take every project seriously and I am highly professional. • Highly responsive – I’ll always get back to you in less than 02 hours. • 100% Client satisfaction – I provide revisions and modifications even after our contract ends. • I provide accurate solutions and just as important, I can guide you to future prospects and put your project on the right track. • Good communication skills – You will find me very friendly to talk to. ========================================= #Windows Servers - clients #Linux Server - clients #Web servers - IIS, Apache, XAMPP, Nginx and Tomcat #Database Servers - MSSQL, ORACLE, MYSQL, MongoDB #Webhosting tools- Plesk, cPanel and CWP #Cloud services providers - AWS, Azure, GCP, Digital Ocean, World stream, OVH Cloud, Hetzner and Hosting raja #Hosting providers - Hostinger, Bluehost, Namecheap, Godaddy, Bigrock and Hostgator #Active Directory - setup, users creation, Centralized Management, policy creation and enhanced Security #Troubleshooting - L1, L2 Tools used ============== Github, SVN IIS,Apache,Tomcat,Nginx , Apache Kafka and Wordpress SSH, RDP, VNC, Anydesk, Splashtop and screen connect Mobaxterm,Toad,SSMS and Workbench Plesk,WHM,Cpanel Active Directory, IAM Servicenow, Redmine, Microsoft Teams and Slack Previous Clients Feedback: 1- "Karthik was an exceptional Upworker to deal with. He was responsive, communicative, knowledgeable and proactive at solving my urgent technical issue (my businesses website was down for an unknown reason) and I wouldn't hesitate to recommend him to anyone else seeking an excellent technical support specialist. Thank you Karthik!" 2- "Karthik went above and beyond to progress with a very difficult issue in a very short period of time. He is kind, hard-working, and knowledgeable." 3- "I recently had the pleasure of working with "Karthik Raja" on installing PMB Software project, and I must say it was an outstanding experience from start to finish. I highly recommend "Karthik Raja" to anyone seeking top-notch freelancing services." 4- "he provides ideas to solve our problems he is a best gem have ever met. He focused only in customer satisfaction. no negative reviews." So why wait? Just invite me to your job on Upwork so we can discuss how to make your project a success. Let’s work together and get it done!! Thanks, Karthik

IT Expert with 8+ years of experience in Managing Windows and Linux-based server infrastructures, Network security and administration, and software solutions. Here are some major services on which I am working: ☑️- Server Administration : ✔️ Windows server : Intune , ADDC, DNS, DHCP, WSUS, Group Policy Management, RDP Server, WDS Server, IIS Server, MS Exchange Server, MS SharePoint, MS Office 365, MS One Drive, MS Teams, File Server (NAS & SAN) , FTP, NTP and many more ✔️ Linux Server : SAMBA ADDC LDAP, SAMBA File Server, DNS, DHCP, Mail Servers (Zimbra, PMTA, Send grid, Squirrel mail, Roundcube). Web Servers (Tomcat, apache, nginx, light speed), MySQL, MariaDB, Postgres, FTP, NTP, Ticketing tools (Manage engine, OS ticket, OTRS Ticket, Citrix XenApp, JIRA, Service now), Monitoring Tools ( Check_mk, Syslog, Nagios, Cacti, ELK Stack, Zabbix, PRTG), IDS Server ( OSSEC, WAZUH, SNORT, Suricata, BRO, Tripwire, Security Onion), DLP/Encryption/ Threat Prevention Server ( Symantec, Sophos, McAfee), Threat Intelligence server (MISP, Mitre, OpenCTI), The Hive with Cortex, ArcSight Server, Dialer Server ( VCdialer, go autodialer, ViciBox, Altitude Dialer), Virtaul Hypervisor ( VMware ESXi, Proxomox, Virtual Box, VMware Workstation), GenieACS TR-069 remote management server, Vulnerability Assessment Scanner Tools (OpenVAS, Nessus Professional, Wireshark, Comodo cWatch, Tripwire IP360) , SonarQube Code analysis Tool, NXfilter URL Filtering tool and Many More.. ☑️- Network Administration: Key Network Skills & Security Products Experience: o Firewall – Checkpoint, Cisco ASA, Palo Alto, Fortigate, Sophos, o Router & Switches : Cisco, Mikrotik, Ubiquiti, Netgear, Aruba o Intrusion Detection & prevention – Cisco, Checkpoint, Sophos o Switching: Vlan, Inter Vlan, Stp, Vtp, EtherChannel, Switch Port o Configuration and troubleshooting of routing protocols OSPF, RIP, EIGRP, BGP o Setup of security implementations (Filtering Tool ACL, route map, port security.) o Well versed in the operations, configuring, and troubleshooting of various issues in Checkpoint and Cisco, Mikrotik, Ubiquiti, Netgear & and Aruba Devices. o Checkpoint IPSec VPN Blade, Application & URL filtering Blade, IPS Blades, o Configuration & troubleshooting of IPSEC and S2S VPN ☑️- Information Security I help organizations stay compliant with all the important standards like PCI DSS, HIPPA, ISO 27001, GDPR, FISMA, and GLBA. In addition to these compliances, I also help companies with Information Security Assessments and Penetration and vulnerability Testing for identifying loopholes in their security infrastructure and BCP/DR consulting for building programs to stay ahead of future security incidents. ☑️- Cloud Solutions: I Help organizations to deploy their services on AWS, GCP, and Microsoft Azure cloud & Freshservices. Projects not for me: ✖Asking to hack/crack/access someone else accounts, systems, social media, etc

I'm Nevin Davis, I have a degree and diploma in Computer Science and Engineering. I'm a redhat certified engineer with 8 years of experience as a server administrator. My strengths and skills are:- * Well knowledge in AWS, Google Cloud, Azure... etc * Sound knowledge in Linux/Unix like operating system. * Deep knowledge in cPanel/WHM. * Familiarize with Plesk, Interworx, Website Panel, Webmin, Directadmin, CyberPanel, HestiaCP. * Automated installation of Red Hat Enterprise Linux. * Network configuration and troubleshooting. * Server hardening. * Managing partitions and file systems. * Managing flexible storage with LVM. * User Management & Administration. * Managing selinux. * Basic creation and troubleshooting on scripting like Shell/Perl. * Installing and managing softwares. * Managing installed services. * Kernel re-configuration & parameter tuning. * Installation of patches and packages. * File sharing with FTP. * NFS configuration & administration. * Job Scheduling and Automating process using CRON. * XEN, OpenVZ virtualization. * RAID * Idera Back up server management. * Familiarize web servers- Apache, Litespeed, Nginx. * Deep knowledge in SolusVM. * Migration. * SSL Cert generation, installation. * IPMI, KVM console management. * Billing Module Management(whmcs,vision,osticket) * VPS, Shared and Dedicated server Management * Monitoring (Nagios) & troubleshooting with performance related issues. * Installation of Antivirus and Troubleshooting with virus related issues.

Welcome to my profile! With over 10 + years of experience as a System Administrator and Email Marketing expert, I bring a wealth of expertise in managing and optimizing various aspects of web hosting and server environments. Web Hosting Expertise : I specialize in a diverse range of hosting panels including WHM/Cpanel, Zpanel, Plesk, Virtualmin, Ispconfig panel, Direct Admin, Centos Web Panel, Webuzo, among others. My proficiency ensures seamless management and operation of hosting environments. Services Offered : My services encompass comprehensive Linux and Windows server setup, security enhancements, performance optimizations, seamless server migrations, SSL implementation, and meticulous management of server components such as Apache, Nginx, Postix, Exim, Bind DNS, and more. Linux OS Mastery : I am well-versed in various Linux distributions including Ubuntu, CentOS, Redhat, Fedora, Debian, and all Linux flavors, enabling me to cater to diverse server environments with precision and efficiency. Cloud Services : I offer expertise across leading cloud platforms such as Amazon Web Services, Linode, Digital Ocean, Google Cloud, ensuring robust and scalable hosting solutions tailored to your requirements. Email Campaign Management : Elevate your email marketing efforts with proficiency in a wide array of email campaign managers including Mailgun, Convertkit, SalesHandy, PHPlist, EmailOctopus, SendinBlue, AWS SES, Postal, PowerMTA, GreenArrow, Interspire, Mailwizz, Mumara, Sendy, Sendgrid, Mautic, ElasticEmail, Mailchimp, Klaviyo, and more. Firewall Expertise : My expertise extends to implementing and configuring firewalls such as Unix/Linux Iptables, CSF, and other firewall solutions to fortify your server security and protect against potential threats. I am dedicated to providing outstanding service and enhancing your hosting and server infrastructure. I eagerly anticipate working with you to accomplish your goals with effectiveness and efficiency.

Managing various application of Linux/Unix environments. ✔️ Linux:- CentOS | Ubuntu | Debian | Redhat ✔️ Apache | Nginx | LiteSpeed | MySQL | PhpMyAdmin | CWP | WHM | cPanel ✔️ Deployments:- LAMP | LEMP | Node.js | Python | Tomcat | JBoss | RoR ✔️ CMS:- Wordpress | Drupal | Joomla | Mediawiki | Moodle ✔️ Email Servers:- Zimbra | Postfix | Mail-in-a-box | modoboa ✔️ Google GSuite | Microsoft 365 Admin | Sendgrid | AWS SES ✔️ Networking/Firewall | PfSense | IPFire | OpenVPN ✔️ DNS | NFS | SAMBA| FreeNAS ✔️ DevOps | CI/CD | Jenkins | Ansible | Git ✔️ Containerisation | Docker |Kubernetes ✔️ FreePBX | Digium VOIP System ✔️ Cloud Platform | AWS | Linode | DigitalOcean | Azure | GCP ✔️ VMware | vSphere (vCenter, ESXi) | VirtualBox | KVM | QEMU