Umer Siddiqui · Senior Systems & DevOps Engineer

Cybersecurity‑minded engineer building secure, scalable infrastructure.

12+ years across Linux/Windows administration, DevOps automation, full‑stack web, and offensive security. Founder of Leetsolutions. Available for freelance and remote roles.

Linux Windows Server Docker Apache Nginx AD · DNS · DHCP Burp Suite Metasploit

About

Versatile IT professional with 12+ years in systems engineering, DevOps, full‑stack development, and cybersecurity. I deploy and manage Linux and Windows servers, automate builds and configuration with shell scripting and containers, and design resilient infrastructure with backups and disaster recovery.

On the security side, I conduct penetration tests (Burp Suite, Metasploit), harden Linux, address OWASP Top 10 issues, and implement robust firewall and network controls. I also manage core services and protocols including DHCP, DNS, Active Directory, and VLANs.

Previously, I founded and ran Leetsolutions, delivering web development, system administration, and network support for clients—strengthening delivery, leadership, and client management.

Skills & Tools

DevOps · CI/CD Shell Scripting Docker Linux Hardening Penetration Testing OWASP Top 10 Firewalls Apache Nginx WHM / cPanel Plesk Webmin Active Directory DNS DHCP Microsoft 365 Backups & DR Full‑stack Web

Services

DevOps & SRE

CI/CD, containerization, infrastructure automation, monitoring and reliability.

Systems Administration

Linux/Windows servers, web servers, hosting panels, backups and disaster recovery.

Cybersecurity & Pentesting

Web app assessments, OWASP Top 10, Linux hardening, firewall and network security.

Network & AD

DNS, DHCP, VLANs, Active Directory design and administration.

Web Development

Secure, performant web apps with modern stacks and best practices.

Consulting & Training

Architecture reviews, security workshops, and team enablement.

CI/CD for Multi‑Service AppDevOps

Containerized services, Git‑based deployments, zero‑downtime releases, and backup automation.

Case Study

Web App Penetration TestSecurity

Identified and mitigated OWASP Top 10 risks; delivered remediation roadmap and hardening.

Report

Hosting Platform MigrationSystems

Moved 100+ sites across WHM/cPanel to hardened stack with monitoring and backups.

Overview

AD & Network OverhaulNetwork

Redesigned AD, DNS, DHCP, and VLANs to improve security and reliability.

Details

Experience

Senior Systems & DevOps Engineer · Various Clients

2019 — Present

Designed secure, scalable infra; automated deployments; delivered penetration tests and hardening.

Founder · Leetsolutions

2015 — 2019

Led projects in web dev, system administration, and network support; managed clients end‑to‑end.

Systems & Network Engineer · Earlier Roles

2012 — 2015

Administered Linux/Windows servers, improved uptime, implemented monitoring and DR.