Mauricio Carlos Marangão Junior
Senior Linux System Administrator | DevOps Engineer
Profile
Senior Linux Systems Administrator with experience since 2015 across enterprise operations, Linux platform support, cloud services, systems hardening, virtualization, and infrastructure troubleshooting. Strong background in Red Hat and Debian administration, incident and change handling in ITIL environments, patching, shell automation, and support for production workloads in cloud, on-premises, and virtualized environments.
Hands-on practitioner with an active homelab, including self-hosted Wazuh SIEM and Ollama with Llama 3.1 under Docker containers. Target role is Senior Linux Sysadmin / DevOps Engineer with focus on infrastructure reliability, automation, security, and cloud operations.
Employment History
Lead Linux/Unix Systems Administrator at Kyndryl
Remote | January 2022 — Present
- Manage tickets in ServiceNow queues within ITIL-based enterprise operations.
- Take ownership of incidents and change requests transferred across shifts.
- Plan and schedule Linux patching cycles, security fixes, and maintenance windows.
- Build, manage, patch, and rebuild Red Hat and Debian servers for development and production environments.
- Provide L3 support for high-priority incidents requiring quick resolution.
- Develop and maintain shell scripts for security configuration and tools installation.
- Create runbooks, documentation, and knowledge transfer sessions for colleagues.
- Support systems in cloud, on-premises, and virtualization providers.
Systems and Network Administrator, Freelancer at Upwork
Worldwide | October 2020 — Present
- Deploy Apache Tomcat, Java JVM services, and application runtime environments.
- Automate jar deployment workflows with Bash scripts.
- Develop Python scripts to collect and export data to monitoring tools.
- Deploy and manage Zabbix with MySQL.
- Implement MeshCentral for remote device management.
- Deploy MyWorkDrive with Azure Blob Storage and hierarchical namespaces.
- Deploy NetBird VPN under Docker with 2FA and Docker environments with Portainer and MySQL on AWS.
- Deploy UniFi Controller in VPC environments and Nextcloud on Oracle Cloud.
Technology Analyst at Sercomtel S/A Telecommunications
Londrina | June 2015 — January 2022
- Monitored network topology and structure for a telecommunications company.
- Performed analysis of network topology and service connectivity.
- Supported client line and network difficulties.
- Worked with ADSL and fiber service analysis and client support operations.
Education
Technologist, Pitágoras College
Londrina | February 2013 — August 2015
- Implementation and management of local and remote computer networks.
- Connectivity between systems and diagnosis of data communication problems.
- Network security, Linux and Windows server services, ITIL, and project management foundations.