Hire the Best Unix Developers

With 20 years of experience across industries like logistics, finance, education, e-commerce, and telco, I bring deep technical expertise and leadership to every project. My career spans roles at global companies like Nespresso and multiple CTO positions in startups, where I’ve architected and scaled systems from MVP to production. As an UpWork Expert-Vetted freelancer (Top 1%), I’ve helped clients worldwide design, build, and optimize complex platforms — from mission-critical enterprise systems to lean MVPs. Clients trust me to step in at any stage: rescue high-stakes projects, design scalable architectures, or lead end-to-end product delivery. 💡 Selected Highlights - CTO, MarocSchoolBus.com – Built a real-time school bus tracking system with React, TypeScript, and AWS serverless, used by schools, drivers, and parents. - Technical Lead, ScienceBank.com (Harvard-affiliated) – Guided the architecture and delivery of a scientific peer review platform on AWS serverless and React. - Principal Engineer, LittleVista.ie – Managing full-stack development and DevOps for a childcare SaaS platform. - Enterprise Projects – Led Java migrations and system integrations for Nespresso, Ericsson, and other major organizations. 🔧 Technical Expertise Cloud & DevOps - AWS Certified (Solutions Architect, Developer, SysOps) - Serverless, Microservices, CI/CD pipelines, Infrastructure as Code Backend Architecture - Java (Oracle Master Certified Java EE Architect) - Node.js, REST APIs, event-driven systems, blockchain integration Frontend Engineering - ReactJS, Angular, TypeScript, Next.js, SPA development Startup Enablement - MVP design & execution - CTO-as-a-Service - Architecture consulting & scaling strategies 🎯 Whether you need a scalable architecture from scratch, an MVP to validate your vision, or expert guidance to optimize an existing system, I deliver solutions that are robust, future-proof, and tailored to your business goals.

With 12 years of experience starting from Full-Stack Development (2014) to Senior DevOps (2018), I bridge the gap between code and infrastructure. I specialize in the 'Trifecta': Bare Metal Performance, Containerized AI Workloads, and Proactive Security. I don't just fix servers; I build resilient, automated environments that scale with your product. I would be very happy if you could see the actual condition of your server and optimize it as efficiently as possible. Experience in problem solving on linux server while server as Web Server, DB server, shared hosting (WHM/ cpanel or native ), mail server, file server, DNS server, monitoring server or other app. With 5++ years experience on devops and server infrastructure. Also become web development since 2014, I will help you to deploy your website, troubleshooting error and optimization. My strengths are: 1. Server kind, i.e : baremetal, Openstack architecture, VMware, Openshift, VPS / VM, Container (Docker/ LXC), Docker compose, Cloud Computing (AWS, digital ocean, Google cloud, etc), Shared hosting (VestaCP, ISP config, WHM, Plesk, cyberpanel) 2. AI infrastucture and automation. 3. Server management and monitoring with technology, e.g : NGINX, APACHE2, BIND DNS, mysql, postgresql, librenms, grafana, prometeus, elk, Zimbra, DOCKER, traefik, LXC, WHM / CPanel, PHP-FPM, docker-compose. 4. PHP OOP, MVC, HMVC programming. Native or framework (Laravel , CodeIgniter, Wordpress) 5. Python apps 6. Database architecture. Mysql and MongoDB. 7. JavaScript/JQuery for Optimization UI. Browser side and asynchronous data processing used Ajax. 8. HCI infrastucture, VPS mode, lxc container, docker container. 9. Web service security implementation/improvement on Application-level. Protection against SQL injection, XSS and request forgery/spoofing. Captcha ready solutions. 10. Honeypot technology (Glastopf and all about attack on web server) 11. Using GIT or SVN.

I have been developing software for Linux for over twenty years, both professionally and personally, in a broad range of fields. My primary programming language is C, but I do a lot of work in Python and C#, and I use or have used many other languages in a variety of environments and operating systems. Game engine, tools and logic development is my main focus, but all aspects of programming interest me. I very much enjoy problem solving, and I am quite skilled at finding and fixing tenacious bugs. General areas of work include graphics programming, physics simulation, 2D and 3D math, high performance multi-threaded programming, debugging, compiler development, model import, export and processing tools. Languages: C, C#, Python, GLSL/HLSL, C++, Objective-C, Ruamoko (Objective-QuakeC (I wrote the compiler)), 80x86 assembly Tools: gcc, git, autoconf, automake, make, Blender, Unity, DJGPP, OpenGL, bash, sed Operating Systems: Linux, MS-DOS

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 build and maintain backend automation systems — Python scripts, data pipelines, and Linux server infrastructure — for teams that need reliable, hands-off operations. What I handle: - Python Automation: Scripts for scraping, scheduling, data processing, and third-party API integrations (REST/Websocket) - Linux & Server Administration: Setup, configuration, and troubleshooting of Ubuntu/Debian servers, Nginx/Apache, and Docker-based deployments on AWS EC2 - Data Pipelines: ETL scripts that clean and transform CSV/JSON/XML data into structured formats, with logging and error handling built in - Database Work: PostgreSQL, MongoDB, and SQLite — schema design, deduplication, and automated data loading - API Integration & Event-Driven Orchestration: Building headless REST APIs (Django REST Framework) and securing them with Token Authentication. Designing real-time, event-driven webhooks and asynchronous business logic pipelines using orchestration engines like n8n. I'm a clear communicator, respond fast, and I test everything before I call it done. If you need something built and then actually maintained — not just handed off broken — let's talk.

Australian with Russian origin, started UNIX programmer/system administrator in Russian pioneer ISP company, 20+ years of free-lance - web-development, scripting, UNIX system admin, web-site configuration/migration/backups, software installation/tuning. Background in mathematics allows me to find unusual and effective approach to the problem. Doing my best to get the work done quickly Main area of expertise - all sort of UNIX work: scripting (PHP/Perl/bash), C programming, system administration (LAMP/Apache/Mysql/nginx/cron/SSL/FTP/DNS/Postfix/Dovecot/Varnish etc.), software installation and upgrade, backup, data migration etc. with wide variety of UNIX flavours (Amazon EC2/Ubuntu/Centos/Fedora/RedHat/Free BSD/BSDI/Solaris/AIX/SCO) - web-development, mostly core PHP/MySQL, as well as HTML/JS/AJAX etc. - general programming/scripting - C/PHP/Perl - custom scripts/web-apps to work with various APIs - Amazon S3, Google, Youtube, facebook, Tumblr, oAuth etc. - Audio/Video/Image/documents processing - ffmpeg, imagemagick, GD, avisynth, lame, Photoshop etc. My username on Hacker Rank: funster