Paul Ispas, known online as rojackal
CTO and infrastructure engineer for Linux, networks and automation
As Chief Technical Officer at HPRO Group Limited, I design, run and improve the infrastructure behind proxy services, VPN platforms, billing systems, automation tools and production websites.
The work is hands-on: stable servers, better performance, tighter security, automated routine operations, and production problems fixed at the root cause rather than patched over.
About
Built around real production infrastructure
Linux server administration, web hosting, proxy networks, VPN systems, automation, billing platforms and performance tuning. The goal is always the same: systems that stay reliable, maintainable and useful under real operating conditions.
I prefer proven technology, readable configurations, useful logging and direct troubleshooting. Infrastructure has to be documented, recoverable and maintainable by whoever is on call for it. Simple and stable beats fashionable and complicated almost every time.
Experience
Technical leadership backed by hands-on work
Current role
Chief Technical Officer
HPRO Group Limited
I lead technical work across server infrastructure, proxy and VPN services, WHMCS automation, web performance, security hardening, payment integrations, monitoring and operational improvement.
The role combines infrastructure engineering and system administration with technical planning, service development and business-critical troubleshooting.
Visit HighProxies.comInfrastructure operations
Linux servers, networking, DNS, firewalls, TLS, web services, monitoring, automation and production incident resolution.
Proxy and VPN systems
HTTP and SOCKS5 proxy services, VPN infrastructure, IP allocation, authentication, abuse prevention and service reliability.
Web and billing platforms
WordPress, WHMCS, PHP applications, customer portals, payment integrations, automation hooks and administrative workflows.
Skills
Core areas of expertise
A practical stack built by operating, maintaining and troubleshooting live services.
Linux and server administration
- Rocky Linux and RHEL-based systems
- systemd services, journals and diagnostics
- Bash scripting and server automation
- Package builds and RPM workflows
- Backup, recovery and maintenance
Web stack and performance
- NGINX configuration and optimization
- PHP-FPM and OPcache tuning
- MySQL and MariaDB administration
- Redis and application caching
- HTTP/2, HTTP/3, Brotli and TLS
Proxy, VPN and networking
- HTTP, HTTPS and SOCKS5 infrastructure
- Dedicated IP and subnet management
- WireGuard, OpenVPN and IKEv2
- Firewalling with nftables
- Authentication and access control
WHMCS and automation
- WHMCS modules, hooks and APIs
- Service provisioning workflows
- Payment gateway integrations
- Customer portal improvements
- Operational and administrative tools
Security and reliability
- Linux and application hardening
- Firewall rules and access restrictions
- mTLS and certificate management
- Fraud and abuse prevention
- Monitoring and incident analysis
Web, SEO and analytics
- WordPress technical maintenance
- Technical SEO and crawlability
- Analytics and conversion tracking
- Landing-page optimization
- Core Web Vitals and website speed
How I work
Practical, direct and accountable
A tool being fashionable is not a reason to add it. Good infrastructure is stable, documented, monitored and repairable. Understand the failure, fix the root cause, and leave the system in better shape than you found it.
- Stability
- Performance
- Security
- Automation
- Clear ownership
This website
Technical notes from real operational work
Notes, opinions, lessons learned and practical guides on Linux, NGINX, MariaDB, WHMCS, proxy infrastructure, VPN systems, security, automation, SEO and the business of running online services.