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🏆 8+ Years of Professional Experience, Centos, Ubuntu, Debian, Redhat, AlmaLinux, Rocky Linux, CloudLinux, Suse, Windows, Mac Systems & Network Administration. 🏆 8+ Years Professional Experience, Apache, Nginx, LIghtspeed, MySQL, MariaDB, MongoDB, Postgresql, DNS, SMTP, FTP, SSH, File-Server. 🏆 6+ Years Professional Experience, AWS, GCP, Azure, Digital Ocean, Liniode, Ionos, Hetzner, Alibaba, Namecheap, Bluehost. 🏆 Email Deliverability expert, Email migration expert, Server migration specialist, Server optimization expert 🏆 Certified Kubernetes Administrator. 🏆 Certified cPanel/WHM/Plesk & Linux Administrator 🏆 Docker, K8S, Ansible, Terraform, Chef, Jenkins. 🏆 PowerShell, Python, Bash. 🏆 Security, SSL, Firewall, Malware, Cloudflare, Sucri, WAF, VPN. 🏆 Server / Websites Optimization. 🏆 WordPress, Magento, Laravel, NodeJs, NextJs, CraftCMS, vBulletin, Xenforo, WHMCS. 🏆 vSphere, Hyper-V, Citrix, Proxmox. 🏆 Malware Removal / WordPress Secure. 🏆 Speed Issues Troubleshooting. 🏆 Email, EOP, ATP, DKIM, DMARC, SPF records, Email encryption, gSuite, Office365.

I have 17+ years of IT experience in the area Application Development, Systems Integration, Production Support, Application Maintenance and QA projects. I have played the role of Project Manager, Project Lead, Business Analyst, Developer and QA. I have managed complete SDLC for medium sized development projects. I have business domain knowledge in the area of Automotive on-board telematics and IT systems, Pharma Relationship Marketing, Manufacturing Execution Systems and Work and Asset Management. I have actively implemented LEAN practices in Production support projects. My technical skills in Database consultancy/administration/development are as follows 1. Design and development of relational and NoSQL databases (Mysql, Oracle, MongoDB). Production support of Mysql and MongoDB databases. 2. Migrating existing databases to Mysql, Oracle and MongoDB. 3. Configuring monitoring and alerts for database servers. 4. Develop business layer applications in PL/SQL / Mysql procedures and UNIX. 5. Setup and support Mysql HA database cluster in single primary or multi primary mode without changes to your data or tables. 6. Setup and support Mysql master-slave replication for backups and failover. 7. Automated Point-in-time recovery of Mysql databases. 8. Performance tune databases like Mysql and Oracle. My programming language skills include 1. PHP 2. C 3. PL/SQL 4. Mysql stored procedures 5. UNIX Shell scripting My technical skills in REST API/Web Services consultancy/development are as follows 1. Creating high performance, scabale, standards compliant and secure RESTful API for backend and business logic processing as microservices or in monolithic service architecture. My technical skills in System/Devops consultancy/administration are as follows 1. Create solution architecture for Cloud and On-Premise infrastructure based on free and open source software stack. 2. Containerize Mysql and other servers using Docker and/or LXC. 3. Deploying LXC containers to create extremely lightweight and tightly packed virtualized environments to isolate, secure and streamline your IT operations. Running LXC containers have near zero performance penalty. 4. Install and configure QEMU-KVM virtual machines with full inter VM and external networking support, 3D graphics acceleration for GUI based administration. 5. Performance tune and secure your LAMP/LEMP and other application stack. 6. Deploying directory servers like OpenLDAP, designing DIT, configuring LDAP access control, indexing, replication and single sign-on. 7. Setup in-memory databases like Memcached or a persistent in-memory database Mysql Memcached plugin for caching or sessions. 8. Setup and maintain secure Email servers using Postfix, Dovecot, Courier IMAP, maildrop, Spamassasin, ClamAV, milters, DKIM, SPF, DMARC and Roundcube webmail. 9. Maintenance and administration of Linux servers like setting up firewall, webservers, mail servers, ldap servers, imap servers, automating system admin tasks using shell scripts, applying security updates, install and uninstall of software packages. 10. Setup of Jenkins for CI/CD of complex project workflows. 11. VPN setup ( IKE/IPSec and OpenVPN )

✔ Expert in Fortigate, Sonicwall, Sophos, pfSense, OPNSense, Cisco, Meraki, Unifi, VPN etc. 🥇 100% JSS & Positive Feedback ☑️ 13+ Years Experience ☑️ 100+ Projects Delivered ⭐️Top Rated Plus ☑️ 93% Long-Term Client ➤ Full Time Freelance Consultant and Engineer with a background as a Senior Information Specialist. ➤ Vast experience working in MSP, Enterprise environment 🏦. Served 100+ projects in Upwork for clients around World 🌎. ➤ My expertise spans network & security design and implementation ( Firewall, Routers, Switches, Wi-Fi, Servers, Cloud ), cybersecurity strategy, migration projects, security enhancement, on-going support & maintenance and troubleshooting, with a focus on balancing performance and protection with compliance, so businesses can grow confidently. 🥈 Core Competencies: 🔹 Network & Security Architecture (Enterprise LAN/WAN, SD-WAN, Cloud & Hybrid Networks). 🔹 Security Audits, Hardening & Infrastructure Assessments. 🔹 Firewall Solutions (FortiGate, Sophos, SonicWall, Unifi, Meraki, pfSense, OPNsense). 🔹 VPN Solutions (Site to Site; Remote access VPN; IPSec/SSL; OpenVPN; WireGuard ) 🔹 Cloud & Hybrid Networking (AWS, Azure, Cloudflare Domain & DNS Management). 🔹 SASE & Zero Trust (Umbrella, CloudConnexa, Perimeter 81, Cloudflare ZTNA). 🔹 IAM & MFA (Entra ID, Okta, Duo, SAML). 🔹 Routing, Switching & Network Segmentation (Cisco, Aruba, Fortinet, UniFi, Meraki). 🔹 Wireless Design, Security, Performance Analysis & Optimization. 🔹 Infrastructure Services (Active Directory, DNS, DHCP, RDP, File Services). 🔹 Endpoint & Access Security -FortiEMS, Sophos Intercept X. 🔹 Compliance Readiness & Security Governance (ISO 27001, SOC 2, PCI DSS, HIPAA). 🔹 Technical Consulting, Documentation & Standards Governance. 👁‍🗨Your Trusted Network Security Expert: :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Leveraging my extensive experience and high-level skills in network security, my ability to rapidly adopt new technologies ensures I stay ahead of the curve, offering a full suite of freelance services to fortify your digital infrastructure and protect your valuable data. 💬 Please connect with me via Upwork chat to discuss your specific requirements.. Thanks 🙏 ------------------------------------------------------------------------ #Network #Security #Fortigate #VPN #SDWAN #Cisco #Pfsense #Sonicwall #Unifi #Meraki #AWS #Fortinet #Firewall #Cloud #VPC #Network Architecture #IPS #Malware Protection #NGFW #ZTNA #SASE #CASB #Cloudflare #Zero Trust #Perimeter 81 #Active Directory #Security Consultant #Sophos #Wifi #Switch #Storage Server #Synology NAS #TrueNAS #RAID --------------------------------------------------------------------------

I am Nevin Davis, a Red Hat Certified Engineer with a degree and diploma in Computer Science and Engineering. Over the past 14 years, I have evolved from a dedicated Server Administrator into a seasoned DevOps practitioner, bridging the gap between traditional infrastructure and modern cloud-native environments. My philosophy is simple: Automate everything, monitor everything, and secure everything. I specialize in transforming manual, legacy server setups into highly resilient, self-healing architectures. Whether you need a complex multi-cloud deployment, a hardened cPanel migration, or a fully automated CI/CD pipeline, I bring a meticulous, engineering-first approach to every project. Core DevOps & Automation Competencies: • CI/CD & Pipeline Engineering: Expert in designing end-to-end automation workflows. Proficient in Jenkins, GitLab CI, and GitHub Actions to streamline code deployment, testing, and release cycles. • Infrastructure as Code (IaC): Deep experience in defining and managing infrastructure using Terraform and AWS CloudFormation, ensuring your environments are version-controlled, reproducible, and scalable. • Configuration Management: Skilled in using Ansible (and basic knowledge of Puppet/Chef) to standardize server configurations, enforce security baselines, and eliminate configuration drift across thousands of nodes. • Containerization & Orchestration: Hands-on experience with Docker for application containerization and Kubernetes (K8s) for container orchestration, including Helm chart management and service mesh integration. • Cloud Architecture (AWS, GCP, Azure): Proficient in designing highly available, fault-tolerant systems across all three major cloud providers, including cost-optimization strategies and serverless architectures (Lambda, Cloud Functions). Legacy & System Administration Expertise (The Foundation): • Linux/Unix Mastery: Advanced administration of RHEL, CentOS, Cloudlinux, Ubuntu, and Almalinux. Expert in kernel reconfiguration, parameter tuning, SELinux, and LVM management. • Virtualization & Hypervisors: Extensive management of XEN, OpenVZ, and KVM, including the administration of SolusVM and IPMI/KVM console management. • Web Hosting Control Panels: Deep, specialized knowledge in cPanel/WHM, alongside Plesk, Interworx, DirectAdmin, CyberPanel, and HestiaCP. • Web Server Optimization: Expert tuning of Apache, LiteSpeed, and Nginx to handle high-traffic loads with minimal latency. • Security & Hardening: Implementation of strict security protocols including firewall configurations, intrusion detection, antivirus installation, and comprehensive server hardening. • Storage & Backup: Management of RAID configurations, NFS, FTP, and enterprise-grade backup solutions (Idera) to ensure data integrity and rapid disaster recovery. • Migration Specialist: Seamless migration of websites, applications, and entire server stacks between platforms, clouds, or data centres with zero downtime. • Monitoring & Observability: Implementation of proactive monitoring using Nagios, Zabbix, and cloud-native tools (CloudWatch) to prompt performance bottlenecks. • Billing & Support Systems: Administration and customization of WHMCS, Vision, and osTicket to streamline business operations. Why Work With Me? I don't just "fix" servers; I build ecosystems. I take the time to understand your business requirements and translate them into technical roadmaps that ensure uptime, security, and agility. With a Red Hat pedigree and a decade and a half of battle-tested experience, I am equipped to handle the most complex, mission critical environments you can throw at me. Let's automate your success.

Senior embedded firmware engineer with 5+ years shipping production networking devices — 10+ product lines, 2000+ units in the field. I take routers, switches, and access points from prototype to production, and I'm now weaving edge AI into the firmware, mesh, and connectivity stacks I've built for years. What I do best: • OpenWRT firmware development (x86, MediaTek, Qualcomm, Broadcom) • 5G/4G bonding routers — inventor on a filed patent for MPTCP scheduling (Indian Patent App. No. 202541092429) • Self-healing mesh networks (BATMAN-adv, 802.11s) with fast roaming • Cloud-managed captive portals (CoovaChilli), Multi-VLAN isolation for hospitality & POS • MQTT telemetry, OTA/FOTA upgrades, remote device management • Edge AI & agentic workflows — AI-enabled domain filtering, custom automation agents Recent wins: • Led the technical turnaround of a US client's stalled product line (CleanRouter, Arizona) as a remote contractor — resolved critical legacy bugs, re-architected mesh communication logic, and took products to shipment-ready • Architected a 5G cellular bonding router with integrated NVR for professional livestreaming • Built enterprise cloud-controlled switches with per-VLAN captive portals and Chromecast isolation for hotels Remote-first, working worldwide. If you need firmware that survives real-world deployments — or AI woven into your network stack — let's talk.

Overview: I secure and segment the infrastructure businesses cannot afford to lose: industrial control networks, production servers, and the boundary between corporate IT and operational technology. 100% Job Success | Top Rated | 1,700+ hours on Upwork. Most of my recent work is OT/ICS: designing and building the controlled access path between an enterprise network and a manufacturing environment, so engineers and vendors can reach plant systems without exposing them. I also do the underlying Linux work that makes it hold together, identity, DNS, time, storage, monitoring, and I document it to a standard that survives an audit. OT / ICS security: - IT-to-OT network segmentation to the Purdue model (Levels 0-5), aligned to IEC 62443 zone-and-conduit principles - Brokered remote access for OT: Apache Guacamole broker, DMZ jump hosts, session mediation, no direct IT-to-OT reach - OT DMZ design and build: controlled realm transition, vendor access mediation, deny-by-default firewall posture - Separate OT identity infrastructure: Samba Active Directory, BIND9 DNS, chrony NTP, Kea DHCP, independent of corporate IT - Air-gapped and internet-restricted environments: internal package mirrors, offline patching workflows, no-egress operation - SCADA/historian platforms: Ignition Gateway, Microsoft SQL Server historians, OT-to-IT one-way data push - Industrial network hardware: Cisco IE-series switches, Sophos XGS firewalls, VLAN segmentation for production lines - Vendor remote access control: time-bound, logged, restricted to approved systems What I deliver: - Wazuh SIEM/XDR deployment: full setup, agent enrollment, custom rules, dashboards, and alerting across Linux and Windows endpoints - Server monitoring stacks: Wazuh, Zabbix, Nagios, Grafana, deployed and tuned to cut alert noise - High availability for infrastructure services: keepalived/VRRP virtual IPs, PostgreSQL replication, HAProxy ingress - Active Directory integration across Linux and Windows: realmd/SSSD, Kerberos, keytabs, group-based authorisation - Linux server hardening to production-grade standards (Ubuntu, Debian, CentOS) - Firewall policy design and enforcement (UFW, iptables, pfSense) - ZFS storage and immutable backup design: snapshot policy, retention, SMB file services, restore validation - DNS architecture with failover, DNSSEC, and SPF/DKIM/DMARC for email security - Virtualization platforms: Proxmox VE, Scale Computing HyperCore, VMware - Windows Server and SQL Server administration: domain join, role-based access, cumulative update management - Cloud infrastructure security across AWS, Azure, GCP, and DigitalOcean - NGINX and Apache optimization for high-traffic environments - CI/CD pipeline security and infrastructure automation with Docker and Bash - VAPT: vulnerability assessment & penetration testing, with formal reporting and remediation timelines - Log analysis, threat detection, and incident response - Build records, runbooks and validation evidence, every change documented, reversible, and auditable Recent work: - Built the controlled access path between an enterprise network and a manufacturing plant: Guacamole access broker, IT-side and OT-side jump hosts, dual-realm Active Directory, and the firewall rule set to go with it. Engineers and vendors reach production systems through one audited, revocable path instead of direct connections. - Deployed an OT file services platform on Debian with OpenZFS and Samba: six access-controlled shares for PLC projects, vendor files, gauge exports and database backups, with snapshot retention and least-privilege service accounts proven by test rather than assumed. - Found and fixed a realm-wide time service that had never worked: the NTP servers were synchronised but serving no clients, and the build-time validation checked the wrong side. The site firewall and several infrastructure hosts had been silently unsynchronised for months. Kerberos authentication depends on this. - Migrated an industrial database platform to a segmented OT zone: Windows Server 2022 and SQL Server 2022, domain-joined, with group-based sysadmin delegation replacing shared credentials, and a documented single revocation point per host. - Deployed and managed Wazuh SIEM across multi-server environments with real-time alerting and compliance monitoring. - Handled a live credential-exposure incident: hardcoded admin credentials pushed to a public repository. Full key rotation and git history remediation, zero downstream compromise. - Delivered a full VAPT engagement for a mid-market client with a structured draft-to-final reporting cycle. - Rebuilt email security posture (SPF, DKIM, DMARC) for a client domain from a failing state to fully compliant. Experience includes serving as Cybersecurity & Infrastructure Manager for a venture firm, Senior DNS & Network Security Engineer at a security company, and Infrastructure & Security Consultant for a US-based consulting firm. I respond within 5 hours.