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  1. Freelancers

Vladyslav V.

Offer Vladyslav work on your next project.

Ukraine Kyiv, Ukraine
1 month 13 days back
Available for hire available for hire
on the service 3 months 30 days
Freelancer Vladyslav V. — Ukraine, Kyiv. Core skill — System & Network Administration, Software & Server Configuration

Rating

Successful projects
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Average rating
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Rating
397
System & Network Administration
54 place out of 584
Software & Server Configuration
42 place out of 226

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)
114 USD
Work with Hosting
20 USD
A Linux administrator is required to protect the nginx server from HTTP flood.
100 USD