Hello, I'm
Sahan Senarathna

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Building secure, scalable, and future-ready IT ecosystems. Mentoring the next generation of network and security professionals.

My Services Contact Me

Available for Projects

4+ Years Experience
40+ Certifications
Top 1% TryHackMe
Sahan Senarathna – Cybersecurity Professional
Sec Expert
Cisco Instructor

WHO I AM

I’m Sahan Senarathna

"Security is a core layer of everything I build. I approach infrastructure with a security-first mindset — identifying weaknesses early and ensuring operational continuity."

I’m an IT Infrastructure and Cybersecurity Specialist. My work centers on designing, deploying, and operating secure, scalable IT infrastructures that support real business operations across networking, server systems, virtualization, and cloud platforms.

Alongside infrastructure engineering, I actively explore offensive security practices, including penetration testing. In parallel with industry work, I serve as a Cisco Networking Academy Instructor, translating complex networking concepts into real-world skills.

Infrastructure Design
Offensive Security
Technical Mentorship
Sahan Senarathna – Professional Portrait
Cisco Certified

CONNECT & VERIFY

LinkedIn LinkedIn Credly Credly GitHub GitHub Hack The Box Hack The Box TryHackMe TryHackMe HackerOne HackerOne HackerRank HackerRank

My Skills

Technical Expertise

A high-level overview of my core technical competencies.

Networking & Infrastructure

Routing & Switching SD-WAN WLAN NMS Windows Server Linux (RHEL/Debian) Active Directory

Cybersecurity

Firewalls & VPN IPS/IDS Zero Trust SOC Ops VAPT Penetration Testing OSINT Incident Response

Cloud & Virtualization

AWS Azure VMware ESXi Proxmox Hyper-V Docker Hybrid Cloud

Scripting & Automation

Python Bash Ansible PowerShell CI/CD Pipelines Network Automation
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WHAT I DO

My Services

End-to-end cybersecurity and IT expertise tailored for your business needs.

SME IT Infrastructure & Managed Services

End-to-end IT design, deployment, and ongoing management for small and medium enterprises.

  • Network architecture and structured cabling
  • Server setup, virtualization & storage solutions
  • Firewall and perimeter security configuration
  • IT helpdesk and managed support services
Outcome: A secure, resilient, and cost-optimized IT foundation for your business.

Penetration Testing & Offensive Security

Simulated real-world attacks to expose vulnerabilities before real threats exploit them.

  • Web application penetration testing
  • Network & infrastructure vulnerability assessment
  • OSINT & reconnaissance engagements
  • Detailed findings report with remediation roadmap
Outcome: Know your attack surface and close gaps before adversaries do.

Defensive Security & Hardening

Systematic security hardening and monitoring to protect assets and ensure compliance.

  • Endpoint and server hardening (CIS Benchmarks)
  • SIEM setup and log management
  • IDS/IPS deployment and tuning
  • Incident response planning and playbooks
Outcome: Robust security posture with continuous monitoring and rapid response.

Technical Training & Mentorship

Structured training programs and mentorship for students and IT professionals at all levels.

  • CCNA, CyberOps & DevNet exam preparation
  • Hands-on cybersecurity lab sessions
  • Corporate security awareness training
  • 1-on-1 career mentorship for IT professionals
Outcome: Certified, confident professionals ready to tackle real-world challenges.
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Security-First Mindset

Every system I build, every network I design, and every person I train is guided by one principle — security is not an add-on, it's the foundation.

Let’s build a secure foundation.

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GET IN TOUCH

Let's Work Together

Have a project, inquiry, or want to explore how I can help? Reach out.

Contact Info

Location

Sri Lanka 🇱🇰
Currently available for new projects