Switch to English?
Yes
Переключитись на українську?
Так
Переключиться на русскую?
Да
Przełączyć się na polską?
Tak
  1. Freelancers

Vladyslav V.

Offer Vladyslav work on your next project.

Ukraine Kyiv, Ukraine
23 days 13 hours back
Available for hire available for hire
on the service 3 months 9 days
Freelancer Vladyslav V. — Ukraine, Kyiv. Core skill — System & Network Administration, Software & Server Configuration

Rating

Successful projects
No data
Average rating
No data
Rating
397
System & Network Administration
56 place out of 588
Software & Server Configuration
42 place out of 223

Language proficiency level

Українська Українська: fluent
Deutsch Deutsch: intermediate
English English: pre-intermediate

CV

I specialize in Linux system administration and security with a focus on stability, access control, and minimizing the attack surface.

I work primarily with Ubuntu Server and FreeBSD, providing full server setup, configuration optimization, and basic security hardening.

Core areas of expertise:

• VPS deployment and configuration
• Firewall setup (UFW, iptables, pf)
• NAT and traffic filtering rules
• VPN deployment (WireGuard, OpenVPN)
• SSH hardening (key-based authentication, access restrictions)
• Basic Linux security audits
• Service isolation (FreeBSD jail)
• Open port and service analysis
• Network troubleshooting

My working principles:

— reducing unnecessary services
— strict access control
— clear documentation
— configuration consistency

I also have experience integrating Linux systems within Microsoft Server environments at the infrastructure and network level.

My approach is structured, practical, and security-focused, aimed at ensuring stable and predictable system operation.

Skills and abilities

Programming

Administration

Portfolio


  • 350 USD

    Real-Time Object Detection & Tracking System (GPU)

    AI & Machine Learning
    A real-time video analytics system developed with GPU acceleration.

    - Object detection (YOLOv8)
    - Person tracking (ByteTrack)
    … - Region of Interest (ROI) control
    - Event trigger when a person remains inside the zone for more than 3 seconds
    - Automatic event snapshot saving
    - YAML-based configuration
    - Structured logging
    - Docker-ready deployment

    The system was tested on NVIDIA RTX 3050 (40–70 FPS).

    Potential use cases:

    - Perimeter security systems
    - Edge AI monitoring solutions
    - Industrial safety applications
    - Video surveillance prototypes
  • 45 USD

    Setting up a secure Ubuntu Server (SSH, UFW, IP restrictions)

    System & Network Administration
    Setting up a secure Ubuntu Server (SSH, UFW, IP restrictions) — example of freelancer's portfolio work in category System & Network Administration
    Basic security hardening of Ubuntu Server has been performed in a test environment.

    Implemented:

    … • Full system update
    • Creation of a separate administrative user
    • Configuration of SSH access exclusively by keys
    • Disabling password authentication and root login
    • UFW configuration with deny incoming policy
    • Restricting SSH access by specific IP
    • Setting up rate limiting to protect against brute-force
    • Checking open ports using nmap

    The goal was to minimize the attack surface and ensure controlled access to the server.

Activity

  Latest proposals 4
Set up a server for radio broadcasting
56 USD
Need a specialist for building and supporting IT infrastructure (system admin)
116 USD
Work with Hosting
20 USD
A Linux administrator is required to protect the nginx server from HTTP flood.
101 USD