Critical Incident Resolution
Instant response to outages and critical incidents. Root-cause analysis across servers, networks and applications — and permanent fixes, not workarounds.
As a Senior System Administrator, I design, build, scale, secure and keep Linux & Windows infrastructures running 24/7. From virtualization to container orchestration, from hosting platforms to disaster recovery — end-to-end operations, with every problem solved at its root.
Hi, I'm Uğur Karaaslan — a Senior System Administrator with many years of hands-on experience designing, operating and rescuing mission-critical server infrastructures.
Over the years I have worked across virtually every layer of the stack: bare-metal servers and data center hardware, Linux and Windows Server, VMware, Hyper-V, Proxmox and KVM virtualization, Docker and Kubernetes clusters, hosting control panels, web servers, databases, mail systems, networking, firewalls and load balancers. This breadth lets me see the whole picture — and find the real cause of a problem fast, wherever it hides.
I am the person teams call when something is truly broken. A server that won't boot, a website that suddenly slows to a crawl, a database under heavy load, mail that refuses to deliver, a network bottleneck or a security incident in the middle of the night — I analyze, isolate and resolve it, then put proactive measures in place so it never happens again. There is no system I'm not at home with, and no problem I leave unsolved.
Beyond firefighting, I build infrastructure that simply doesn't break: careful capacity planning, hardened security, tested backups and disaster recovery, high availability and clear monitoring. I also act as the final escalation point for customer service and engineering teams, turning complex technical issues into fast, reliable solutions.
My goal is simple: stable, fast and secure systems — and the peace of mind that comes from knowing every issue is in the hands of someone who has seen it all.
Instant response to outages and critical incidents. Root-cause analysis across servers, networks and applications — and permanent fixes, not workarounds.
Design, installation, configuration and lifecycle updates of physical, virtual and container-based server environments to enterprise standards.
Resource trend analysis, growth-ready capacity planning and deep performance tuning that keeps every system fast under any load.
Firewall policies, WAF, DDoS mitigation, malware cleanup, server hardening and incident response to keep infrastructure locked down.
Automated and verified backups, tested disaster-recovery plans, high availability clusters and load balancing for uninterrupted service.
Switching, routing, VLANs, VPNs, DNS and traffic analysis — diagnosing latency, packet loss and connectivity problems end to end.
The last line for customer service and engineering teams: solving the hardest cases, sharing know-how and raising the whole team's level.
End-to-end management and automation of web hosting, domain and server services, including platform migrations without downtime.
Scripting, infrastructure as code and AI-assisted analysis that detect issues early and turn repetitive work into reliable automation.
Pick a category — each one covers real production experience in installation, configuration, troubleshooting and management.
Understanding the real need, sizing resources and designing an architecture that is fast, secure and ready to grow.
$ capacity --forecast 12mBare-metal, virtual machine or container — operating systems and services deployed cleanly, repeatably and by standard.
$ ansible-playbook site.ymlPerformance tuning, security hardening, firewall rules, SSL and access policies — closed to threats from day one.
$ csf -r && sshd -tLoad balancing, clustering and failover so services stay online even when hardware or traffic says otherwise.
$ systemctl reload haproxyMetrics, logs and smart alerts — problems are spotted and fixed before users ever notice them.
$ promtool check rulesAutomated, encrypted and verified backups with recovery scenarios that are actually tested — not just hoped for.
$ restic snapshots --latestRapid incident response, root-cause analysis and continuous improvement — every problem makes the system stronger.
$ journalctl -p err -bServer down? Website slow or unreachable? Network acting up? Whatever the problem, I can help — fast. Reach out for anything that calls for a Senior System Administrator or Network Administrator.
Send a short description of your problem or project — I'll analyze it and get back to you as soon as possible with a clear plan.