a
andr3y53mion0v

Andrey Semionov

@andr3y53mion0v

Linux System Administrator

Lithuania
Lithuanian, Russian
About me
I set up, configure and secure Linux servers for businesses and developers. What I do: - Server setup and configuration from scratch - Firewall setup and network security (nftables) - SSH and kernel hardening via sysctl - Malware removal and incident response - NGINX, MySQL, AWS configuration - Fail2Ban and intrusion prevention I run my own infrastructure at sysadmin.courses built from scratch and tested under real attack conditions. If your server is vulnerable or compromised — I find the problem and fix it permanently, not just clean up the symptoms.... Read more

Skills

a
andr3y53mion0v
Andrey Semionov
Offline • 

See my services

Server Administration
I will set up and secure your linux server
From$30 / projectMore details
Server Administration
I will remove malware and clean your hacked wordpress site
From$40 / projectMore details

Portfolio

Work experience

Self_Employed

Sysadmin Courses

Self Employed • Self-employed

Mar 2025 - Present • 1 yr 2 mos

Built and maintain a Linux & DevOps education platform from scratch. Manage server infrastructure, security hardening, firewall configuration and protection against real attacks.