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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.

Passionate IT Professional | Cloud Architect | Microsoft Purview Architect | Microsoft 365 & Cloud Security Architect | Helping Businesses Secure, Streamline & Scale 🚀 Empowering Businesses with Secure, Efficient Microsoft 365 Solutions Hello, I’m Kesavan a Microsoft 365 & Cloud Security Specialist with over 3 years of IT experience. I’ve helped 50+ global businesses, including MSPs and enterprises, to secure, migrate, and modernize their Microsoft 365 environments delivering real results with simplicity and reliability. I specialize in helping organizations enhance security, stay compliant, improve productivity, and reduce IT costs without the complexity. 💼 What I Do ✅ Microsoft 365 Cloud Migrations & Administration * Full Microsoft 365 tenant setup, configuration, and management * Seamless migrations from on-premises, Google Workspace, GoDaddy, Zoho, and others * Email, file, and Teams data migration (Exchange Online, OneDrive, SharePoint, Teams) * Subscription, license, and cost optimization ✅ Modern Endpoint Management with Microsoft Intune * Zero-touch provisioning withnWindows Autopilot * Mobile Device & Application Management (MDM/MAM) * Device compliance, BitLocker, Defender, and policy enforcement for Windows/macOS/iOS/Android ✅ Security, Identity & Compliance * Entra ID (Azure AD): Identity management, MFA, Conditional Access, and PIM * Microsoft Purview: Data protection, sensitivity labels, DLP, compliance policies *Microsoft Defender: Email protection, endpoint security, and threat detection * Security audits, risk mitigation, and best-practice implementations ✅ Ongoing IT Support & Expert Consulting * Tier 2/3 support for Microsoft 365, Exchange Online, Teams, SharePoint, and more. * Troubleshooting and optimization for performance, access, or security issues. 🏆 Why Clients Choose Me ✔ 3+ years of hands-on Microsoft cloud expertise. ✔ Trusted by 50+ global clients, including MSPs and enterprise teams. ✔ Consistently rated 5 stars on Upwork with a 100% job success score. ✔ Microsoft Certified across security, compliance, Teams and administration. ✔ Clear communicator, quick responder, and results-focused partner. 🎓 Certifications That Support Your Success * MS-102 – Microsoft 365 Certified: Administrator Expert * MS-900 – Microsoft 365 Certified: Fundamentals * SC-300 – Microsoft Certified: Identity and Access Administrator Associate * SC-400 – Microsoft Certified: Information Protection Administrator Associate * MS-700 – Microsoft Teams Administrator Associate 💡 Let’s Work Together If you're looking to simplify your Microsoft 365 management, improve security, or ensure compliance I'm here to help. 📩 Reach out and let’s discuss how I can support your business success with secure, smart, and streamlined Microsoft 365 solutions.

Expert in Email Configuration, Authentication & IT Systems Administration | 11+ Years Experience I am a highly skilled IT Systems Administrator with 11+ years of experience in email configuration, authentication, deliverability, domain management, and IT infrastructure. I specialize in setting up, managing, and troubleshooting business email systems, ensuring secure, high-deliverability email communication. 💡 Email System Configuration & Management ✔ Google Workspace (Gmail for Business), Microsoft 365 (O365), Zoho Mail and many other email platforms. ✔ Mailgun, SMTP, Postfix, Exim & Other Email Relay Services ✔ Transactional & Marketing Email Setup (Mailgun, SendGrid, Instantly.ai, Lemlist, etc.) ✔ Custom Email Domain Setup, Migration & Troubleshooting 🔐 Email Authentication & Security ✔ SPF, DKIM, DMARC Implementation & Optimization ✔ BIMI & MTA-STS Setup for Brand Protection ✔ Reverse DNS (PTR Records) & Dedicated IP Configuration ✔ SMTP Authentication & Secure Email Protocols (TLS, SSL) 🚀 Email Deliverability & Optimization ✔ Inbox Placement & Avoiding Spam Filters ✔ IP Reputation Monitoring & Blacklist Removal ✔ Domain Warm-up & Cold Email Best Practices ✔ Google Postmaster Tools & Microsoft SNDS Configuration 🌍 Domain Management, DNS Setup & Hosting Services ✔ Domain Registration & Transfer Management ✔ DNS Configuration (A, CNAME, MX, TXT, SRV, PTR Records) ✔ Hosting Setup & Migration (cPanel, Plesk, Cloudflare, AWS, etc.) ✔ CDN Integration & Performance Optimization 🖥️ IT Infrastructure & Systems Administration I also have deep expertise in IT systems administration, virtualization, and troubleshooting, including: ✔ Microsoft Windows Server (Setup, Management & Troubleshooting) ✔ Microsoft Hyper-V & VMware (Virtualization & Failover Clustering) ✔ WSUS (Windows Server Update Services) for Patch Management ✔ Linux OS Installation & Server Configuration ✔ Remote IT Support for Windows, Linux & VMware With my proven track record in IT infrastructure, email solutions, and domain management, I help businesses streamline operations, secure communication, and optimize system performance. 💬 Let’s discuss how I can improve your email setup, IT systems, and domain management!

A highly skilled technology professional with expertise spanning cloud computing, virtualization, containerization, networking, and security. My proficiency includes VMware Tanzu, AVI Load balancer, VMware VCF, VMware VVF, Kubernetes, and comprehensive Kubernetes Administration. I bring practical experience as a Fortinet Firewall Administrator and Checkpoint Firewall Administrator, coupled with expertise in Veeam Backup solutions. I am adept at Microsoft Azure Infrastructure Architecting and Deployment, and designing effective Hybrid Solutions. Currently enhancing my knowledge with a Master of Information Security. My foundation includes a Bachelor of Computer Science and CCNA,CCNP, along with KQL, SQL health Administration, Dev-Ops practices and skills. I am eager to leverage my diverse skillset to contribute to your projects.

I am an experienced IT professional with over 10 years of hands-on experience and a flexible approach to work. Throughout my career, I have successfully completed numerous projects across different domains. Having worked for more than 3 years as a Network Engineer in a broadcasting company (Sports TV channel), I have also gained extensive expertise in live video production and post-production. I am proficient in media-related applications such as Adobe Premiere Pro, After Effects, Blender, vMix, Resolume Arena, and Aximmetry (Unreal Engine). Areas of expertise Firewalls Fortigate,Cisco ASA, Cisco Meraki, Draytek, MikroTik, Pfsense, IPCOP IPS: Snort, Suricata Email Gateways: Forti Mail, Symantec Bright Mail Gateway Storage : Synalogy, EMC, Thecus, HP SAN, Freenas, OpenFiler OS : Windows 2016 – 2008 R2, Redhat, Ubuntu Server, Centos, Windows 10 to 98 Servers : Active Directory, Windows and Samba File Servers, Web Server Apache IIS, DNS Servers, Zimbra mail Server, Terminal Server TSPLUS, Radius Servers, Networking : Cisco Routers Configurations, Cisco Switches Configurations, Configuring VPN IPsec Site to Site Video Production(Pre and Post); Adobe Premiere Pro, Adobe After Effects, vMix

I’m a DevOps enthusiast with a strong focus on cloud-native systems and infrastructure automation. I have hands-on experience designing, deploying, and managing scalable cloud environments, automating application delivery, and improving system reliability, performance, and operational efficiency. Key areas of expertise: Cloud Platforms AWS (EC2, RDS, S3, Route53, ELB/ALB, VPC, IAM) Google Cloud Platform (GCP) Microsoft Azure DigitalOcean, Linode, Oracle Cloud Containerization & Orchestration Docker, Docker Compose Kubernetes (Rancher, Amazon EKS, K3s, RKE2) Helm (chart management and deployments) Containerd Istio (service mesh) Infrastructure as Code & Automation Terraform Ansible (configuration management & deployments) CI/CD & Build Tools Jenkins GitLab CI GitHub Actions Maven, Gradle Version Control & Collaboration Git, GitHub, GitLab Monitoring & Observability Prometheus, Grafana, Alertmanager, Thanos Web Servers & Reverse Proxies Nginx, Apache Databases & Storage MySQL, PostgreSQL, MariaDB, MongoDB, ClickHouse Redis (caching) MinIO (S3-compatible object storage) Operating Systems & Virtualization Linux (Ubuntu, Debian, Kubuntu), Windows VirtualBox, VMware, KVM Scripting & Programming Bash, Python Security & Networking SSL/TLS, Certbot, Let's Encrypt WireGuard, Tailscale (VPN) DNS management Other Tools & Productivity JIRA (ticketing) scp, rclone (file transfer) Vaultwarden Editors: Vim, Nano n8n (workflow automation), CrewAI WordPress (CMS deployments)