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Are your VoIP systems unreliable, your network slow, or your IT operations hard to keep on top of? I help businesses solve exactly that — with fast, reliable, and well-documented solutions. With over 9 years in IT, I specialise in service delivery, VoIP engineering, network administration, and Linux system administration. I have hands-on expertise with Asterisk PBX — from initial deployment and dial plan configuration to troubleshooting and ongoing optimisation for call centres and business communications teams. Here's what I bring to every engagement: • VoIP system setup, configuration, and support (Asterisk, FreePBX, SIP trunking) • Network administration — LAN/WAN, routing, switching, firewall management • Linux administration — Ubuntu, CentOS, scripting, and automation • End-to-end IT service delivery — from helpdesk operations to infrastructure management • BPO and call centre technical support — systems, tools, and agent support • Remote troubleshooting, documentation, and clear client communication I hold a 100% Job Success Score on Upwork and take pride in delivering work that's on time, well-communicated, and built to last. I'm comfortable working independently or as part of a distributed team, and I adapt quickly to new environments and tools. If you need a reliable, experienced IT professional who communicates clearly and gets the job done right — let's talk. Send me a message and I'll respond within a few hours.

Red Hat Certified System Engineer, having around 12 years of experience working in Linux environment and worked on many projects over the year involving Cloud and Dedicated servers. Knowledge of Enterprise Infrastructure technologies and architecture. Worked as consultant on various projects in the past to design and implement an environment which uses Linux and Clusters to run Applications. Os : Linux and Wondows server expert Cloud Services : AWS,GCP, Linode, ToggleBox Configuration : Ansible Containers : Docker/Kubernetes Relational Database Servers : MySql, Oracle, PostgreSql, MsSql,MongoDB DB Languages : Pl/Sql,Stored Procedures, SSIS Scripting Languages : Bash, Perl, Java No Sql Database servers : MongoDB Atlassian: Jira Web servers: Apache, Nginx, Tomcat Mail Servers : Zimbra,Postfix,Sendmail,Hmail,Dovecot Monitoring: Nagios, Zabbix, Monit, Munin, Cacti Virtualization: Openvz, Vmware/Vsphere ESXi/server, VirtualBox CMS : Wordpress, Magento firewalls: iptables, ufw Other: standard network services (DNS, DHCP, FTP, SVN/Git, http proxy, VPN, backups, monitoring etc)

Senior System Administrator specializing in Microsoft 365, Active Directory, AWS, and enterprise infrastructure reliability. For the past 4 years, I've been the sole infrastructure consultant supporting production systems for Revalize LLC (USA), managing customer-facing enterprise environments where downtime directly impacts revenue. Alongside this long-term enterprise infrastructure ownership, I've delivered migration and remediation projects for 20+ organizations across SaaS, manufacturing, and professional services. Core expertise: - Microsoft 365 migrations & hybrid Exchange - Active Directory & Windows Server administration - AWS cost optimization & infrastructure reliability - PowerShell automation & process optimization - Disaster recovery & business continuity Clients typically bring me in when: → Migration projects have stalled or lack expertise → Active Directory or mail infrastructure becomes unstable → Production environments lack documentation or monitoring → Infrastructure costs are growing unexpectedly → Internal teams cannot safely troubleshoot production systems Recent project outcomes: → Migrated 500+ users from Exchange 2016 to Microsoft 365 with zero email downtime during 72-hour cutover → Reduced AWS infrastructure costs by 30% ($47K annually) through EC2 rightsizing and Reserved Instance strategy → Restored multi-site Active Directory replication affecting 450+ users across 3 locations within 8 hours → Recovered a non-booting domain controller with SYSVOL/DFSR failures in 6 hours, preventing an authentication outage → Automated user onboarding workflows, reducing provisioning time from 2 hours to 10 minutes Microsoft 365 & Exchange - Exchange Online & hybrid Exchange migrations - Tenant-to-tenant migrations - Hybrid identity (Entra ID / Azure AD) - SharePoint & Teams administration - SPF / DKIM / DMARC configuration - Intune device management & endpoint compliance policies - MFA enforcement, Conditional Access, and Microsoft 365 governance - Exchange sync troubleshooting & mailbox recovery Active Directory & Windows Infrastructure - Domain controller recovery & SYSVOL/DFSR replication repair - Multi-site domain controller deployments - Group Policy management & troubleshooting - FSMO role management & transfer - Hybrid AD environments (on-premises + Entra ID) - Windows Server 2012 R2 through 2022 administration AWS & Cloud Infrastructure - Cost optimization & infrastructure analysis (40-60% average reduction) - EC2 rightsizing & Reserved Instance strategy - RDS performance tuning & elastic pool optimization - CloudWatch monitoring & proactive alerting - VPC design & auto-scaling configuration Infrastructure Reliability & Operations - Disaster recovery planning & backup validation - Production change management & operational handoff - 24/7 emergency support for production infrastructure incidents - Flexible timezone coverage (US, UK, Australian business hours) Additional experience includes VMware vSphere, Hyper-V, Fortinet/pfSense networking, Veeam/Commvault backup solutions, and enterprise ITSM platforms including ServiceNow and JIRA. Certifications: → AWS Certified Solutions Architect – Associate → Microsoft 365 Certified: Fundamentals (2024) → MCSA: Windows Server 2016 → Fortinet NSE 1 & NSE 2 Network Security Clients value reliability, communication, and operational accountability just as much as technical execution. If you need an experienced infrastructure engineer to stabilize, migrate, optimize, or maintain production systems, send me: → Current infrastructure overview (platform, user count, pain points) → Project goals and timeline → Any existing documentation or error logs I respond within 24 hours with a project assessment and approach. Available for scheduled migrations, infrastructure remediation, and urgent production recovery engagements.

Hey! I'm Chamara Shalinda, a Cloud & Solution Architect passionate about designing scalable, resilient, and future-ready systems. I enjoy solving complex technical challenges, defining system architecture, and helping engineering teams build solutions that are reliable, efficient, and easy to scale. I'm driven by technology, innovation, and making smart architectural decisions that create long-term business value. Whether it's cloud architecture, platform engineering, DevOps, or reliability, I love turning complex ideas into practical solutions. Let's build systems that are not only powerful, but also built to last.

Whether you’re setting up monitoring for the first time or operating a full NOC environment, the most common problems are the same: missed incidents, alert noise, and dashboards that don’t reflect reality. I help organizations design and stabilize clear, reliable monitoring setups using Zabbix and related tools, and where scale or complexity requires it, evolve those setups into structured NOC and SOC operations without unnecessary overhead. Many of my engagements start with straightforward monitoring implementations and grow over time as operational needs increase. I work collaboratively with in-house engineers and adapt recommendations to existing constraints, budgets, and operational culture, rather than forcing textbook or vendor-driven solutions. NOC / Monitoring Zabbix, Prometheus, OpenNMS, Grafana SOC / SIEM / EDR / XDR Wazuh, TheHive, Cortex, MISP Automation Ansible, PowerShell, Shell, Python Networking & Systems Cisco IOS, Meraki, Juniper JunOS, MikroTik, Ubiquiti, HP Aruba, iLO, Fortinet, OPNsense, firewalls, WAFs, IPS Servers & Platforms Microsoft Server, CentOS, Ubuntu, Debian, Proxmox Infrastructure & Cloud IPAM, NetBox, Cloudflare, Azure, AWS, GCP, Hetzner, IBM Softlayer Certifications & Education CCNA · CCNP · CCDA JNCIA-Junos MCP · MCSA ITIL v3 Foundation MSc in Innovative Technology

I'm Amila Kothalawala, a seasoned IT professional with a passion for Linux, open-source technologies, and a knack for transforming complex systems into efficient, secure, and reliable solutions. My expertise lies in Linux server administration, open-source software deployment, Zimbra collaboration suite, and pfSense firewall configuration. My Services: 🐧 Linux Administration: Proficient in managing and optimizing Linux servers (Ubuntu, Rocky, Debian). Installation, configuration, and ongoing maintenance for peak performance. 🌐 Open-Source Deployments: Extensive experience with a variety of open-source tools and applications. Tailored solutions for your business needs, including Nextcloud, GitLab, Docker, and more. 📧 Zimbra Collaboration Suite: Expert installation and configuration of Zimbra mail servers. Email collaboration, calendaring, and document sharing tailored to your organization. 🔐 pfSense Firewall Configuration: Robust firewall setup for enhanced network security. VPN configuration, QoS optimization, and traffic management with pfSense. Why Choose Me: ✅ Expertise: 12 Years of hands-on experience in Linux administration and open-source deployments. ✨ Custom Solutions: Tailored configurations to align with your unique business requirements. 🛡️ Security Focus: Implementing industry-best practices to fortify your infrastructure. 🌍 Global Experience: Successful projects delivered for clients worldwide. How It Works: 📝 Consultation: Let's discuss your project goals, current infrastructure, and specific requirements. 💼 Planning: I'll create a customized plan based on our discussion to meet your objectives. 🚀 Implementation: I'll proceed with the installation and configuration, keeping you updated at every step. 🛠️ Optimization: Rigorous testing and optimization for performance, security, and scalability. 📈 Ongoing Support: I offer post-implementation support to ensure your systems run smoothly. Let's Elevate Your Infrastructure: Ready to enhance your IT infrastructure? I'm here to deliver exceptional Linux, open-source, Zimbra, and pfSense solutions. Reach out today, and let's get started on your next project!