Available for projects · Remote · PL / EU

Your Linux
Security Expert.
On demand.

I harden systems, audit security postures, design resilient infrastructures and respond to incidents — with 20+ years of hands-on Linux experience across production environments, networks and critical services. No fluff. Just results.

20+
Years Linux
500+
Systems secured
24/7
Incident SLA
RTO 15m
Recovery target
root@linux-guru:~ — bash — 80×24
root@linux-guru:~uname -r
6.1.0-27-amd64 #1 SMP Debian 6.1.115-1
root@linux-guru:~uptime -p
up 20 years, still hardening
root@linux-guru:~id
uid=0(root) gid=0(root) groups=0(root)
root@linux-guru:~cat /etc/motd
Linux Security Expert. 500+ systems secured.
root@linux-guru:~
linux-guru.pl · subbrand of n-security.com

Precision. Depth.
No shortcuts.

I am a freelance Linux & security specialist operating under the LINUX-GURU brand — a focused, personal offering built on top of n-security.com's operational methodology. Where N-SECURITY.com delivers team-based managed services, LINUX-GURU is me: hands-on, direct, expert-level.

My work covers the full stack of Linux security — from kernel hardening and access control to network perimeter design, log analysis and real-time incident response. Every engagement is scoped, documented and executed with engineering discipline, not guesswork.

Whether you need a one-time security audit, a production server built from scratch, a resilient VPN infrastructure or someone on call when things go wrong at 5 AM — I deliver.

Linux Hardening
Production systems hardened at every layer. Built to stay secure under operational load.
Penetration Testing
Real-environment testing to validate controls before attackers do. Risk-ranked findings, concrete fixes.
Network Security
Segmented networks, enforced trust boundaries. Zero tolerance for ambiguous rulesets.
Incident Response
Containment, root cause analysis, post-incident report. The same failure does not happen twice.
LINUX-GURU
Linux Security Expert · linux-guru.pl
Experience20+ years
Primary OSDebian / RHEL family
SpecialisationSecurity & Hardening
ModeRemote · Hybrid
LocationPL / EU
Response timeSLA-based · 24/7
services.list()

Everything Linux.
From kernel to perimeter.

A complete range of Linux & security services — engineered for production environments, not demo labs.

expertise.stack

Technical stack.
Production-grade.

Six domains. One standard: if it runs in production under SLA, I know it cold.

how.i_work

Structured. Traceable.
No surprises.

Every engagement follows a disciplined execution model — from initial discovery to documented delivery and ongoing support.

faq.read()

Clear answers.
No ambiguity.

Common questions about working with me, scope, access, pricing and how engagements are structured.

contact.send()

Let's talk Linux.
I'll respond fast.

Tell me what you're dealing with. I'll come back with a clear scope, timeline and price — no vague proposals.

direct contact
Corporate
n-security.com
Team-based managed services
Mode
Remote / hybrid (PL/EU)
incl. on-site interventions
// fastest path

Describe your system (OS, version, role) and what you need. The more specific, the faster I scope and price — no back-and-forth.

› contact_form — I reply within 24h, usually same day