Hire the Best Kernel Specialists
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With more than a decade of hands-on experience in Linux server administration, I bring deep expertise in managing, optimizing, and troubleshooting complex Linux infrastructures. I have provided enterprise-grade web hosting and server support for major platforms including Hostinger, GoDaddy, Bluehost, OVH, DigitalOcean, Hetzner, and IONOS, supporting large-scale shared, VPS, and dedicated environments. My skill set includes comprehensive WordPress management and migrations, covering site deployments, performance optimization, security remediation, malware cleanup, and zero-downtime migrations. I also specialize in architecting and maintaining robust web stacks using Apache, Nginx, BIND DNS, PHP (5.x–8.x), and MySQL/MariaDB, with a strong focus on reliability, performance, and security. I have a proven track record of handling critical tasks such as server security hardening, kernel upgrades, and server performance optimization. Additionally, I am proficient in administering and monitoring Linux servers remotely using advanced tools and technologies. Key Specialties: Linux System Administration (CentOS, AlmaLinux, RHEL, Debian, Ubuntu, CloudLinux) Large-scale server migrations, including WordPress and Joomla migrations Server upgrades, including CentOS 7 to AlmaLinux 8/9/10 transitions Expertise in web hosting panels (cPanel, Plesk, DirectAdmin, Virtualmin) and cloud solutions (AWS EC2, Lightsail, DigitalOcean, Linode, Vultr, Google Cloud) Expertise in DNS integration for Shopify, Wix, Cloudflare, Google WorkSpace, Microsoft 365 DNS administration, including advanced configurations for SPF, DMARC, and DKIM PCI compliance management, server disaster recovery, and data restoration Website security, including hack cleanups and proactive hardening Tools and Technologies: LAMP stacks, DNS, and mail servers (Exim/Postfix) Backup solutions (R1Soft, rsync-based scripting) Server monitoring (Nagios) and optimization tools Security-focused tools like CSF and LFD If you're looking for a dedicated and detail-oriented Linux server administrator who can ensure your systems run smoothly and securely, let's collaborate to meet your technical goals.

I help Wi-Fi MSPs, Edge IoT Service Providers, ISPs, and network operators build carrier-grade cloud platforms for device management, subscriber onboarding, Wi-Fi operations, authentication, billing, and service automation. I am the Founder & CEO of Router Architects, a 35-engineer software company specializing in cloud-native networking platforms, OpenWiFi ecosystems, OpenWRT development, subscriber management systems, and large-scale device management solutions. Over the last 22+ years, I have worked on networking and service-provider software used by some of the world's largest operators, including Comcast, AT&T, and Charter Communications. My experience spans every layer of the service delivery stack—from embedded Linux and router firmware to cloud-native SaaS platforms managing hundreds of thousands of devices. Key Areas of Expertise ✔ Multi-tenant SaaS platforms for Wi-Fi MSPs and ISPs ✔ Cloud-managed Wi-Fi platforms ✔ Subscriber onboarding and lifecycle management ✔ Device provisioning and remote management ✔ Authentication, AAA and RADIUS infrastructure ✔ Billing and monetization platforms ✔ OpenWiFi and OpenLAN solutions ✔ OpenWRT firmware development ✔ OpenSync integrations ✔ Edge IoT connectivity platforms ✔ Captive portals, OpenRoaming and Passpoint ✔ Network automation and observability OpenLAN Leadership I am one of the primary architects and maintainers of the OpenLAN ecosystem. My contributions include: • Founder of the OpenLAN Gateway subgroup • Architect of the OpenLAN appliance platform • Maintainer of core OpenLAN repositories • Major contributor across OpenLAN components • Responsible for approximately 80% of ongoing OpenLAN platform development through my team Our team has developed highly scalable OpenLAN appliances capable of delivering up to 100 Gbps throughput while enabling interoperable networking infrastructure without vendor lock-in. Representative Projects **Cloud-Native Multi-Tenant Wi-Fi Management Platform** Designed and delivered a cloud-native SaaS platform for MSPs and ISPs that combines subscriber management, Wi-Fi operations, AAA, billing, analytics, and network automation into a unified platform. Highlights: • Supports 500,000+ managed devices • Multi-tenant architecture for service providers • Real-time telemetry and analytics • Automated subscriber onboarding • RADIUS and AAA integration • Billing and voucher management • AI-assisted support automation Business Impact: • Reduced operational costs by approximately 40% • Improved support efficiency through automated incident handling • Enabled large-scale Wi-Fi deployments through a single platform Edge IoT Connectivity Platform Developed a secure connectivity and management platform for an Edge IoT service provider operating distributed remote sites. The solution enables centralized management of networking infrastructure, Wi-Fi access points, gateways, and IoT connectivity services while ensuring secure communication between remote sites and cloud applications. Technologies: OpenLAN, OpenWRT, Golang, Kafka, AWS, Keycloak, TLS, DPoP Authentication, Docker Industry Experience • Comcast xFi Cloud Implemented IPv6 functionality for DOCSIS-based residential gateways as part of Comcast's Sunnyvale Innovation Center. • AT&T Digital Life Developed OpenWRT-based CPE software including routing, firewalling, multicast, TR-069 management, IPv4/IPv6 networking, and service delivery components used in the nationwide rollout of AT&T Digital Life. • Charter Communications Developed OpenSync software components for Wi-Fi 5 and Wi-Fi 6 customer premises equipment deployed within Charter's managed Wi-Fi ecosystem. Technologies OpenWiFi, OpenLAN, OpenWRT, OpenSync, RDK-B, TR-069, TR-369, GenieACS, uCentral, FreeRADIUS, Coova Chilli, openNDS, PacketFence, Kubernetes, Docker, Golang, C++, Python, PostgreSQL, Kafka, Redis, AWS, REST APIs, gRPC, WebSockets, Microservices, Edge IoT, VPN Technologies, IPv4, IPv6. Why Clients Hire Me Most software teams understand SaaS development. Most networking teams understand infrastructure. My team specializes in both. We build platforms that combine cloud software, networking, subscriber management, authentication, device management, Wi-Fi operations, and carrier-grade scalability into production-ready solutions. Whether you need a cloud-managed Wi-Fi platform, an OpenWiFi deployment, an Edge IoT connectivity layer, a subscriber management platform, or a large-scale device management system, we bring the experience required to design, build, and scale it successfully.

Need someone who can manage your Linux infrastructure and actually knows what's happening below the application layer? I'm Shivam, a Linux systems engineer and DevOps specialist with 5+ years of experience, and a contributor to the Linux kernel mainline. I build, secure, and debug Linux servers and cloud infrastructure with the kind of low-level systems knowledge most DevOps engineers don't have. 𝐇𝐎𝐖 𝐈 𝐂𝐀𝐍 𝐇𝐄𝐋𝐏 𝐘𝐎𝐔 🐧 𝐋𝐢𝐧𝐮𝐱 𝐒𝐲𝐬𝐭𝐞𝐦 𝐀𝐝𝐦𝐢𝐧𝐢𝐬𝐭𝐫𝐚𝐭𝐢𝐨𝐧 Provision, configure, and harden Linux servers (Ubuntu, Debian, RHEL/CentOS). Comfortable with systemd, networking, user/permission management, backups, and security hardening for production systems. 🧩 𝐋𝐢𝐧𝐮𝐱 𝐊𝐞𝐫𝐧𝐞𝐥 𝐃𝐞𝐛𝐮𝐠𝐠𝐢𝐧𝐠 & 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐓𝐮𝐧𝐢𝐧𝐠 As an actual contributor to the Linux kernel mainline, I can dig into problems most admins can't, kernel-level memory issues, driver conflicts, and performance bottlenecks below the application layer, not just symptom-level fixes. ⚙️ 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 𝐚𝐬 𝐂𝐨𝐝𝐞 CI/CD pipelines, Docker containerization, and Terraform-managed infrastructure. I build fault-tolerant, repeatable systems instead of fragile ones held together with manual SSH sessions. 🌐 𝐂𝐥𝐨𝐮𝐝𝐟𝐥𝐚𝐫𝐞 𝐒𝐞𝐭𝐮𝐩 & 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 DNS configuration, CDN tuning, WAF/security rules, and Cloudflare Workers for edge logic, get your site fast, secure, and resilient. ☁️ 𝐂𝐥𝐨𝐮𝐝 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 (𝐀𝐖𝐒) EC2, Lambda, S3, and CloudWatch setups designed for reliability and cost efficiency, backed by my AWS Certified AI Practitioner credential. 🏆 𝐋𝐈𝐍𝐔𝐗 𝐊𝐄𝐑𝐍𝐄𝐋 𝐌𝐀𝐈𝐍𝐋𝐈𝐍𝐄 𝐂𝐎𝐍𝐓𝐑𝐈𝐁𝐔𝐓𝐎𝐑 This is the part most Linux freelancers can't say: I've had patches merged into the actual Linux kernel. My work has included fixing how `vrealloc()` releases physical memory pages when shrinking allocations (it previously only updated bookkeeping), adding memory-shrinking support to a Rust kernel data structure, and a related optimization in the Rust binder driver, plus hardware-specific display/backlight driver fixes. The work was reviewed and signed off by core Linux maintainers, including Andrew Morton, the longtime maintainer of the kernel's memory-management subsystem. In practical terms: if your issue is below what a typical sysadmin can diagnose, an odd kernel panic, a memory leak invisible to application logs, a misbehaving driver, I can read the kernel source and actually fix it. 🌟 𝐖𝐇𝐀𝐓 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐒𝐀𝐘 🌟 ❝ Working with Shivam was a fantastic experience. His expertise in performance-oriented languages like Rust and C++ was a game-changer for our project. He delivered a highly efficient and meticulously optimized solution, demonstrating a rare talent for deep, logical problem-solving at the systems level. What impressed me most was his ability to connect this low-level expertise with high-level strategic thinking. He doesn't just understand the algorithms; he has the foundation to make them run incredibly fast. Highly recommend for any demanding technical role. ❞ - Client ❝ great to work with ❞ - Adam C. ❝ Shivam was amazing. This was my second time using him for a project and I was extremely happy. I will definitely be going back to him for any new projects. ❞ - Salman L. ➤ 𝐑𝐄𝐀𝐃𝐘 𝐓𝐎 𝐅𝐈𝐗 𝐀𝐍𝐃 𝐇𝐀𝐑𝐃𝐄𝐍 𝐘𝐎𝐔𝐑 𝐈𝐍𝐅𝐑𝐀𝐒𝐓𝐑𝐔𝐂𝐓𝐔𝐑𝐄? Looking for a Linux system administrator, DevOps engineer, or Cloudflare specialist who understands systems from the kernel up? Message me on Upwork today. I typically respond within 6 hours and prioritize delivering production-ready results. 𝐓𝐎𝐎𝐋𝐒 & 𝐓𝐄𝐂𝐇𝐍𝐎𝐋𝐎𝐆𝐘 𝐋𝐢𝐧𝐮𝐱 & 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 - Linux Kernel (mainline contributor) - Ubuntu / Debian / RHEL / CentOS - systemd, Bash scripting - Networking & firewall configuration (iptables/nftables) - Server hardening & security - Performance debugging (strace, perf, ftrace) 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 - Docker - Terraform - CI/CD (GitHub Actions, GitLab CI, Jenkins) - Ansible - Monitoring (Prometheus, Grafana) 𝐂𝐥𝐨𝐮𝐝 & 𝐄𝐝𝐠𝐞 - AWS (EC2, Lambda, S3, CloudWatch, SageMaker) - Cloudflare (Workers, DNS, CDN, WAF, Zero Trust) - AWS Certified AI Practitioner 𝐏𝐫𝐨𝐠𝐫𝐚𝐦𝐦𝐢𝐧𝐠 & 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 - Rust - Python - Node.js / TypeScript - Bash 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬 - PostgreSQL - MongoDB - Redis Linux System Administrator, Linux System Administration, Linux Kernel Developer, Linux Server Management, Linux DevOps, DevOps Engineer, Senior DevOps Engineer, Cloudflare

** I am what I am because of what we all are. ** I am a self-motivated, hard-working, and open-source contributor. I am also an Android Enterprise Certified Professional. My GitHub handle is *amsurana* Mobile experience [since 2009] * Worked on Qualcomm, Mediatek, Amlogic, Rockchip based devices. * Porting and Writing Device Drivers * Customizing Android Kernel * Android Automotive OS Expert - Projects and Consulting. Ported Automotive OS to RPI. * Android Firmware development for all kind of Devices [PCBA, Phones, Tablet, TV, Accessories] * Android SDK/NDK * Android Wearable * Custom ROM - I have deep experience in customizing Android and modifying the entire OS experience as per the requirements. Some of the customizations I have done - changing boot animations, modifying shutdown screen, removing bloatware, developing system-level apps, making a tablet a Kiosk (without permissions), Bluetooth stack modification, Carrier config updates, and many more. * Secure OS - Make your Android ultra-secure. * OTA for A/B Seamless or Non-AB devices * Secure Android OS using AVB Tool * MDM, EMM, Mobile Device Management - If you plan to use MDM or develop your MDM, do reach out to me. I have experience in Airwatch, SOTI, ScaleFusion, Gears42, and FieldX. Special Skills: Z-wave, Zigbee, IoT, Amazon Alexa, Google Home Assistant, Smarthome, IFTTT Keywords - Android, Web, Social Media Integration, Java, J2EE, Bluetooth, BlueZ, DBus, AOSP, Custom ROM, Docker, Play Framework, Linux, AWS, EC2, MongoDB, Eclipse, Cyanogen mod, LineageOS Android TV, Android OS, Custom ROM, Tizen, LinegaeOS, RaspberryPi, OrangePi, Khadas VIM, HiKey, Amlogic, Rockchip, Airwatch, SOTI, MDM, EMM, Pentest, Penetration Testing, Qualcomm, Mediatek

High-Performance C++ Developer | Low-Latency & Systems Optimization I specialize in writing hardware-aware C++ code that maximizes CPU efficiency. My expertise includes: Memory Optimization: Custom Arena Allocators and Cache-Locality (L1/L2 optimization). Concurrency: Multithreaded systems using Atomics and Producer-Consumer patterns. Low-Level I/O: High-speed file access via Memory-Mapped I/O (mmap). I have a proven track record of processing millions of data points in milliseconds. Check out my 10-Project Performance Lab on GitHub Hours of availability: 10:00 AM – 10:00 PM IST. A guaranteed response to all technical inquiries within 12 hours.

Work Experience Summary As a DevOps Specialist & Ruby on Rails Backend Engineer , I collaborate with cross-functional teams to deliver high-quality software solutions using agile methodologies and automation tools. I have over 8 years of IT experience as a Ruby on Rails Dev and DevOps Engineer. My core competencies include Ruby on Rails, Ansible, Jenkins,CI-CD Pipeline,Docker,Robot framework,Automations,Azure services, and REST API. I am passionate about continuous improvement, innovation,and customer satisfaction. My goal is to leverage my skills and expertise to help individuals/ companies to achieve their digital transformation and business objectives.