Linux & Server Operations
Linux server configuration, network settings, service troubleshooting, command-line diagnostics, and recovery-oriented investigation.
SYSTEMS · INFRASTRUCTURE · AUTOMATION
Building and maintaining
reliable systems.
I’m Alamgir Hosen. I work across server administration, hosting infrastructure, mail platforms, VoIP technologies, and practical web-based tools.
FOCUS: Infrastructure that is understandable, maintainable, and dependable.
SYSTEM OVERVIEW•••
Infrastructure layer
Servers · Services · Tooling
Reliability mindset ACTIVE
Linux & hostingServer operations
Tools & automationPractical workflows
01 / INFRASTRUCTURE
LINUX ADMINISTRATION✳HOSTING SYSTEMS✳MAIL INFRASTRUCTURE✳VOIP & WEBRTC✳WEB TOOLING✳LINUX ADMINISTRATION✳HOSTING SYSTEMS✳MAIL INFRASTRUCTURE✳VOIP & WEBRTC✳WEB TOOLING✳
01 / ABOUT
Technical work with
a practical mindset.
I work with the systems behind everyday digital services: servers, control panels, business email platforms, communication stacks, and supporting tools.
My approach is to understand an issue at its root, verify the evidence, make changes carefully, and leave systems easier to operate and troubleshoot.
Hands-on technical support · Infrastructure operations · Tool development
02 / EXPERTISE
Areas I work in.
A practical mix of systems troubleshooting, service operations, and application-level problem solving.
Hosting & Virtualization
cPanel environments, hosting-service issues, Proxmox virtualization context, and server configuration troubleshooting.
Business Email Systems
Mail-service operations and support topics involving Zimbra and SmarterMail, including migration and backup requirements.
VoIP & Browser Calling
Working with SIP-based communication, FusionPBX/FreeSWITCH, WebRTC, and browser calling architecture.
Web Tools & SSL Workflows
Improving web interfaces for certificate workflows such as CSR generation, verification, and PFX conversion.
Backup & Recovery Planning
Planning backup workflows, remote incremental backups, and granular mailbox/domain restore paths.
03 / SELECTED WORK
Projects & focus areas.
Systems and product ideas reflected in my technical work. Status labels are intentionally conservative.
P / 01
SSL Tools & Certificate Monitor
A web-based workflow covering certificate verification, CSR generation, PFX conversion, saved items, and certificate monitoring. Current focus includes interface improvements and troubleshooting PFX upload/password validation.
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P / 02
Backup Management System
Planning a backup platform with remote incremental backups, isolated storage, and granular restore requirements for domains and mailboxes, including Inbox and Sent Items coverage.
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P / 03
Browser-Based Calling
Exploring browser calling with WebRTC and SIP over WebSocket, including extension setup and the role of JsSIP or SIP.js with a PBX backend.
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P / 04
Email Platform Operations
Technical support and requirements work involving business email environments, migration considerations, service-provider operations, and backup/restore planning.
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04 / HOW I WORK
Diagnose first.
Change with purpose.
01
Understand the symptoms
Collect logs, errors, configuration context, and the exact scope of impact before changing a system.
02
Verify the root cause
Use targeted checks to separate the underlying cause from secondary errors and misleading symptoms.
03
Apply and document the fix
Prefer controlled changes, validation after implementation, and clear communication about impact and next steps.
05 / CONTACT
Have a technical challenge
to work through?
For infrastructure, systems troubleshooting, or web-tool discussions, send a message and include a little context about the problem.
Start a conversation ↗