Mohammad Sameur Rahman
Infrastructure and System Administrator with 7+ years of experience in Linux server administration, web hosting infrastructure, technical operations, incident management and production support.
Experienced in Bash scripting, server hardening, backup automation, web server configuration and production troubleshooting.
Hands-on experience building and managing projects involving AWS cloud infrastructure, Terraform, Docker, Ansible, Jenkins CI/CD, Kubernetes, and monitoring with Prometheus and Grafana.
Cloud & Infrastructure: AWS — EC2, IAM, EBS, S3, AMI, AWS — ELB & Auto Scaling, VPC, Subnets & Route Tables, Terraform (Infrastructure as Code)
DevOps & Automation: Docker & Docker Compose, Kubernetes, Ansible, Jenkins & CI/CD pipelines
Operating Systems: Linux — Ubuntu, Linux — RHEL / AlmaLinux, Windows Server
Web & Hosting: Nginx, Apache, cPanel & WHM, Plesk & Webuzo, Cloudflare & JetBackup
Networking & Security: DNS & SSL/TLS, TCP/IP & SSH, Firewalls & Security Groups
Scripting & Databases: Bash / Shell scripting, MySQL
Monitoring & Tools: Prometheus, Grafana, Git & GitHub
Operations & Leadership: Incident Response & RCA, SLA Management & On-Call Support, Technical Documentation, Team Supervision & Mentorship
System Administrator — Jielian Technologies Ltd
- Managed and optimised 5 production Linux servers, ensuring 99.9% uptime across web hosting and client application environments.
- Automated server provisioning, patch management and configuration tasks using Ansible playbooks, reducing deployment effort by 40%.
- Orchestrated containerised application deployments using Kubernetes (Deployments, Services, ConfigMaps, PV/PVC) and Docker, improving system reliability.
- Provisioned cloud resources on AWS (EC2, S3, IAM, EBS, ELB) using Terraform as Infrastructure as Code to streamline environment scaling.
- Integrated Git/GitHub version control workflows and reduced manual server troubleshooting time by 30% through Bash automation scripts.
Operations Manager & System Administrator — Diana Host Ltd.
- Leadership & Operations: led technical operations and supervised a team of Junior System Administrators, fostering cross-functional collaboration and setting clear performance targets.
- Incident & SLA Management: established 24/7 on-call rotation support and standardised Incident Response workflows, ensuring 99.9% uptime and reducing Mean Time to Resolution (MTTR) by 35%.
- Client & SLA Compliance: managed high-priority production escalations for 500+ client accounts, adhering strictly to Service Level Agreements and minimising operational risk.
- Infrastructure Security & Backups: oversaw 22 production Linux/VPS nodes, implemented Cloudflare security rules to mitigate DDoS attacks, and maintained automated JetBackup disaster recovery pipelines.
System Administrator — Diana Host Ltd.
- Maintained 16+ Linux-based production servers, achieving consistent system stability and service availability.
- Monitored server health (CPU, RAM, Disk I/O) and proactively resolved network, DNS and HTTP errors before client impact.
- Developed custom Bash scripts to automate daily system maintenance, log rotations and routine system checks.
- Managed SSL/TLS certificates, domain configurations and email delivery optimisation for hundreds of active websites.
Technical Support Engineer — Innovadeus Pvt. Ltd.
- Handled L1/L2 technical support for 50+ daily client tickets, maintaining an average resolution time under 2 hours.
- Diagnosed and resolved hosting, web server, email delivery and DNS issues across Linux and Windows server environments.
- Restored interrupted web services and collaborated with senior engineers on complex infrastructure escalations.
- Terraform AWS Infrastructure: Provisioned AWS infrastructure using Terraform, including EC2 instances, VPC networking and Security Groups — environments described as code instead of console clicks.
- AWS ALB & Auto Scaling: Configured an Application Load Balancer with health checks, multi-AZ deployment and target-tracking auto scaling policies.
- Ansible Automation: Automated Node.js application deployment using Ansible playbooks with systemd service management and an Nginx reverse proxy in front.
- Jenkins CI/CD: Built a Docker-based Jenkins pipeline with automated build, testing and security checks before deployment.
- Kubernetes Deployment: Worked with Deployments, Services, ConfigMaps, Secrets and persistent storage to run Node.js and MongoDB workloads.
- Monitoring & Alerting: Implemented Prometheus, Grafana and Node Exporter for infrastructure monitoring and alerting.
- Linux Server Hardening: Hardened production Linux servers: SSH configuration, firewall rules, service minimisation and audit logging.
- Automated Backups: Scheduled backup automation for databases and files with retention policy and verified restore procedure.
- Dockerized Applications: Containerised applications with Docker and Docker Compose for consistent local, staging and production behaviour.
- Nginx Reverse Proxy with HTTPS: Nginx reverse proxy terminating TLS for backend applications, with certificate management and redirect rules.
- AWS VPC Networking: Designed an AWS VPC with public and private subnets, route tables, internet gateway and NAT routing.
Portfolio: github.com/imsameur/devops-projects
cPanel & Hosting Infrastructure: cPanel & WHM System Administrator I · cPanel & WHM System Administrator II · cPanel Professional · WHM Administration · cPanel Certified Partner Accreditation · cPanel & WHM Sales Professional · JetBackup 5 · Immunify360 · LiteSpeed · SafeAdmin
Web Development: HTML5, CSS3 & Bootstrap 4 for Web Development
BSc (Hons) in Computing (Second Class) — University of Greenwich, London, UK, Delivered in Bangladesh through Daffodil International Academy, Dhaka · 2022
Higher Diploma in Computing (Second Class) — Daffodil International Academy, Dhaka · 2018
HSC — Science (GPA 4.8) — Govt. Rajendra College, Faridpur · 2011–2012
SSC — Science (GPA 5.0) — Nalia Shyamamohon Institution, Rajbari · 2009–2010