Hire the Best OpenX Specialists

I help businesses secure and optimize Linux infrastructure, firewalls, VPNs and virtualization environments. Specialized in: Network & Security: OPNsense | pfSense | Wazuh SIEM Wireless & Infrastructure: Ubiquiti UniFi Ecosystem Virtualization & Backup: Proxmox VE | Proxmox Backup Server VPN & Connectivity: WireGuard | OpenVPN | Cloudflare Tunnel SysAdmin & DevOps: Linux Servers | Docker | Reverse Proxy Core Services: Network Troubleshooting | Infrastructure Hardening I work mainly with: VPN issues Firewall configuration Secure remote access Reverse proxy problems Linux server deployments Monitoring and log analysis High availability environments I focus on fast troubleshooting, security best practices and stable infrastructure delivery. If you need someone to solve infrastructure and security problems quickly and professionally, let’s talk.

I am a seasoned System Administrator with over 14 years of experience in designing, deploying, and maintaining enterprise-grade IT infrastructures. I specialize in building efficient, reliable systems that keep businesses running smoothly Competencies: - Infrastructure Design: Deploying robust Windows & Linux environments - Networking: Advanced configuration of routers, switches, and access points - Virtualization & Containers: Hyper-V, KVM, Proxmox, Docker - Operational Excellence: Automated backups, VoIP, and proactive monitoring systems Certifications: - MCSE (Server Infrastructure) - CCNA (Routing and Switching)

✅ ABOUT ME: I am a Professional Full Time Freelancer. I have 9+ 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

When systems break under real-world constraints — unstable networks, missing documentation, mixed hardware — I step in to diagnose and fix them. I specialize in: • Systems integration (IoT, edge devices, multi-protocol environments) • Real-time streaming (WebRTC / RTSP / low-latency pipelines) • Performance & storage engineering (high-throughput, large-scale systems) • Distributed systems & Go backend (control-plane, metadata services, cluster coordination) Selected work: • Airport perimeter security platform Integrated fiber optic vibration sensors, IP cameras, alarms, and lighting into a unified real-time alert platform. → Received hands-on training from Fibersonics engineers on sensor physics and signal analysis — applied this to configure per-zone detection parameters, achieving near-zero missed detections with low false positives across outdoor conditions → Debugged and stabilized WebRTC/RTSP streaming through packet-capture analysis — no documentation available; resolved by reading ZLMediaKit source code and tracing protocol negotiation → Deployed and in active use • Offline mesh-based classroom system Built ESP32-C6 mesh network for student response collection in zero-WiFi environments. → Power-optimized to ~1 month battery life (4000mAh) in testing → Designed full stack: embedded firmware + desktop management + cloud analytics • Offline canteen management system Implemented custom TCP server on Android with a Windows C++ Qt client over direct ethernet. → Ensured data integrity for large transfers in a network-restricted environment with no external infrastructure → Deployed and in active use • Metadata control-plane for disaggregated database (major state-owned bank) Core developer of the Go-based metadata/control-plane service that enabled compute-storage separation on a Greenplum/PostgreSQL-based distributed database. → Centralized TB-scale metadata — transactions, sessions, locks, invalidation state — previously trapped inside local compute nodes → Built on FoundationDB (core KV backend), etcd (cluster coordination, leader election), and a custom RPC layer → Implemented session lifecycle, distributed locking, deadlock detection, and invalidation message pipeline • Disaggregated storage system (China Construction Bank) Core developer of the disaggregated storage module managing thousands of PBs across multi-cloud object storage (AWS S3, Alibaba Cloud, Huawei Cloud, Tencent Cloud) behind a ~1TB local cache. → Designed query-driven prefetching and segmented caching of hot data → Cold start ~20x slower than SSD; warm cache performance on par with SSD • Adaptive compression engine (YMatrix time-series database) Designed automode system that dynamically detects data characteristics across stream segments and selects optimal encoding chains (zigzag, simple8b, deltadelta, Gorilla2, lz4/zstd). → Deployed in production — patented encoding chain design Prior to the above, I spent 6 years as Lead Engineer at FreeWheel (a US media-tech company, acquired by Comcast), building Kubernetes-based microservices platforms and cutting fault localization time from over a day to under a minute using Istio service mesh and distributed tracing. Before that, I was a Technical Expert at Alibaba Cloud, where I extended a database proxy to support the PostgreSQL protocol (read/write splitting, failover reconnection) and built a stability engineering system for RDS PostgreSQL that kept the service running through 2021 Double 11 — one of the world's highest-traffic e-commerce events. I've diagnosed production issues across Go, C++, and distributed systems — including a Golang memory leak traced through Prometheus metrics to a misconfigured HTTP client, and C++ performance bottlenecks in deployed systems. My approach: correlate monitoring data with business operations to narrow scope before touching the code. I've published source-level analysis of Prometheus internals on InfoQ. Domain experience with counter-drone detection systems — participated in field testing and evaluation of RF detection and optical tracking platforms, with firsthand understanding of operational scenarios, detection requirements, and alert workflow needs. If you're dealing with: • unstable integrations • streaming issues (WebRTC / RTSP) • hardware + software systems not working together • performance problems in production —I can help you find and fix the root cause. Tech stack: Systems Integration Engineer | Edge AI, Video, Embedded & Distributed Systems