Hire the Best Wowza Media Server Specialists
in China

🛡️ IT Infrastructure Expert | Secure Email · VPN · Server Hardening · Remote Support 📍 Shenzhen, China | 30+ hrs/week | Languages: 中文 (Native), English (Written) 💬 Async, professional, and fully documented support via IM (Upwork chat, Telegram, Slack) 💡 “I don’t need fancy tech talk. I just want everything to work — securely, efficiently, and without surprises.” If that’s you — you’re exactly the kind of client I support. I’m a senior IT infrastructure engineer with over 10 years of experience helping founders, technical teams, and global SMEs build and maintain secure, stable, and fully documented systems. I specialize in async collaboration and systems that just work — with logs, SOPs, and no micromanagement required. 🚀 What I Can Deliver ✅ Email Infrastructure & Deliverability • Enterprise-grade email setup: Postfix, Mailtrain, Mautic • DNS configuration: SPF, DKIM, DMARC, rDNS • Deliverability troubleshooting, bounce management, warmup automation ✅ VPN & Remote Network Access • WireGuard, OpenVPN, SoftEther, enterprise routing • Cisco / MikroTik / OpenWRT / iKuai configuration • Remote workforce access, geo-restricted tunnels, user audit logs ✅ Linux Server Deployment & Optimization • Ubuntu, Debian, CentOS system builds • Docker environments, LEMP/LAMP stack, PHP/MySQL tuning • Secure file sync (rclone / MinIO), systemd hardening, cron automation ✅ Server Security & Monitoring • Fail2Ban, SSH firewall lockdown, UFW/iptables hardening • Centralized logging (Zabbix, Wazuh, Grafana) • Real-time alerting via webhook, Slack, Telegram ✅ Backup & Disaster Recovery • Cloud + NAS + incremental snapshots • Scheduled sync, backup integrity testing, recovery plans • Clean documentation and restore instructions ✅ Network Architecture & Firewall Engineering • VLAN, ACL, NAT, static/dynamic routing • Cisco IOS & ASA configuration (VPN, access rules, IPsec tunnels) • Office & datacenter segmentation, zero-trust perimeter design ✅ Automation & Health Auditing • Bash/Python scripts for status, cleanup, and scheduled inspection • Cron-based healthchecks, daily logs, and IM-based alerts • Fully documented technical handovers ✅ Remote IT Support & Documentation • 100% async, IM-based support (no calls needed) • Full English documentation: network diagrams, server manuals, access sheets • Monthly reporting available: status, changes, security, metrics 🎯 Why Work with Me? • High-trust async delivery: I work independently, update clearly, and follow checklists • Enterprise-ready thinking: I don’t patch — I design for reliability and scale • Documented results: Every config, log, and action is tracked and handed off properly • Long-term support available: from build to maintenance to sunsetting • Secure, structured, and proactive — I think like an infrastructure owner 📦 Available Services 🔹 One-time projects • Email system deployment • VPN configuration • Secure server build • Network/firewall planning • Monitoring system rollout 🔹 Long-term monthly plans • Patch management • Server health & uptime checks • Access control reviews • Backup, logs, and infrastructure reporting 📬 Ready to simplify and secure your infrastructure? Just describe your system — I’ll turn it into a clear, working, and well-documented solution.

I am a seasoned IT System Engineer with a broad coding background and a proven track record in setup systems and softwares, designing and managing robust infrastructure. My core expertise lies in: ✅Systems & Virtualization: Deep proficiency in Linux, server hardware, and virtualization technologies. ✅DevOps & Cloud Practices: Skilled in implementing DevOps principles, with experience in networking, DNS, and storage (RAID) solutions. ✅Embedded & IoT: Hands-on experience in embedded systems and IoT projects, from prototyping and soldering circuit boards to coding. My tech stack： • C, CPP, MIPS Assembly, QEMU and TCG Dev, Linux distro porting • RHEL/CentOS/RockyLinux, Debian/Ubuntu, LoongArch Linux • Apache, Nginx, MySQL/MariaDB, PHP, PHP-FPM, CA and SSL • Python, Java, Objective C and iOS • VMware vSphere, pfSense/OPNSense, OpenWRT, Prometheus, Cockpit • Gitlab, Apache Subversion, Redmine, Jenkins, Docker • NextCloud, ownCloud A Comprehensive Technical Ecosystem: My experience is unified by a deep commitment to Free and Open-Source software. This spans the entire stack: from porting systems for IC design to operating GNU/Linux clusters; from server-side coding to mobile development; and from troubleshooting complex networks and RAID to implementing open-source alternatives to proprietary suites like Google Worksapce and Microsoft 365. End-to-End Solution Delivery: I leverage this broad skill set to deliver complete solutions—whether it's applying foundational knowledge (like that of Internet root servers) to configure complex DNS for a new business site, or developing strategies to enhance efficiency by migrating to public clouds or building cost-effective private clouds. Beyond technical know-how, I am driven by a passion for understanding the "why" behind systems. I am a meticulous professional who prioritizes client success through proactive communication and a detail-oriented approach. With an A-to-Z understanding of computers and networks, complemented by management experience, I am poised to deliver reliable and efficient service.

I am an experienced Linux administrator. I have 15+ years of experience in Linux system administration and problem-solving. I can troubleshooting all kinds of linux issues, centos migration, centos/ubuntu crash rescue, investigate server performance issue and web server administration. Skills & Deliverables: Cloud Infrastructure & Dedicated VPS Setup (AWS, DigitalOcean, Hetzner, Contabo, Linode etc) Building secure, high-performance servers with proper backup, and automation. Linux Administration(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Performance optimization, monitoring, troubleshooting, log analysis, and uptime management. Server migration(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Secure migration of data and app between different servers. Web Server Trouble-shooting Slow server, website troubleshooting and optimization Recurring downtime issue troubleshooting and fix. Centos7 server migration Upgrade centos7 to almalinux 8 or 9. Migrate data&apps from centos7 to Ubuntu/Debian/Rocky/Almalinux Server Upgrade(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Upgrade ubuntu 14 16 18 20 22 to the latest version. Upgrade Debian , Rocky Linux, Almalinux to the latest version Server rescue(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Fix linux system crash, file system corruption. Security & Compliance Firewall configuration, access control, TLS/SSL, patching, vulnerability prevention. Backup & Disaster Recovery Strategy Automated backups, retention policies, restore testing, failover planning. Application Hosting & Migration WordPress, Prestashop, Forum app, Node.js, Python apps — smooth migration without downtime. Email Infrastructure & Deliverability Improvement Domain authentication setup (SPF / DKIM / DMARC), inbox placement, fixing spam issues. Why choose me? - Strong skills and extensive experience , can work independently and efficiently , able to fix complex issues - Fast and clear communication, detail and solution oriented - Honest and proactive work ethic