02 / Curriculum vitae
Marcus Semblano
Senior System Engineer · Karlsruhe, Baden-Württemberg, Germany
Professional summary
Senior System Engineer with 20 years of experience across systems administration, infrastructure, DevOps, security and application analysis. Brings a broad technical foundation, adaptability and a practical, people-focused approach to complex technical challenges. Communicates clearly with diverse teams and stakeholders, taking their different priorities and perspectives into account.
Technical skills
Systems & operations
- Linux
- Operating systems
- DevOps
Configuration management
- Puppet
Containers & orchestration
- Docker
- Kubernetes
CI/CD
- GitLab CI
Monitoring & observability
- Icinga2
- Grafana
- Prometheus
Scripting & version control
- Python
- Bash
- Git
AI & agentic tools
- Artificial intelligence
- AI agents
Work experience
Senior System Administrator
1&1 Mail & Media Applications SE — GMX | WEB.DE | mail.com · March 2022 – August 2025 · Karlsruhe, GermanySystem Administrator
1&1 Mail & Media Applications SE — GMX | WEB.DE | mail.com · March 2017 – March 2022 · Karlsruhe Area, Germany- A mixture of traditional system administration and DevOps advocacy.
- Worked with Debian, Puppet, Icinga2, GoCD, Bash, Git, GitLab, Kubernetes, Grafana and Prometheus.
DevOps Freelancer
Upwork · August 2016 – February 2018 · Remote- Member of Upwork’s tools team, creating and maintaining application monitoring, automated deployment and configuration management projects using AWS.
System Administrator / DevOps
Daitan Group · September 2015 – August 2016 · Greater Campinas, Brazil- Developed infrastructure automation using Opscode Chef and Atlassian Bamboo, including custom cookbooks and recipes for environment and application deployment.
System Administrator
Titans Group · April 2015 – September 2015 · Greater São Paulo Area, Brazil- Helped maintain the infrastructure lifecycle for products and backend services as part of a team.
Security Specialist
Locaweb · June 2013 – April 2015 · Greater São Paulo Area, Brazil- Developed and customized security applications and APIs using Python, Lua, Go, Ruby, Ruby on Rails, ZeroMQ, RabbitMQ, Graylog and Elasticsearch.
- Customized a ModSecurity-based web application firewall, tuned rules, and worked on log visualization and deployment planning.
- Project areas included real-time virus scanning, web application firewall development and anti-fraud integrations.
Application Analyst
IBM · August 2011 – June 2013 · Campinas, Brazil- Customized IBM’s internal Open Client operating system based on Red Hat Linux for security and stability, and supported migration of Windows applications to Linux.
- Technical lead for Firefox and other internal application customizations, packaging, deployment and update management across Linux, Windows and macOS.
Product Development Team Coordinator
International Syst · June 2011 – August 2011 · Belo Horizonte Area, Brazil- Coordinated team activities, task scheduling, deadlines and product quality assurance.
System Analyst
International Syst · July 2009 – August 2011 · Greater Belo Horizonte, Brazil- Customized and developed the OpenSUSE-based Metasys Linux distribution for client requirements, including educational software, security, appearance and hardware needs.
- Worked with RPM packaging, Linux desktop and kernel customization, shell scripting, SVN, Git, Trac, Make and Clonezilla.
Education
Bachelor’s degree, Computer Science
UFMG — Universidade Federal de Minas Gerais · 2006–2009Bachelor’s degree, Electrical and Electronics Engineering
UFMG — Universidade Federal de Minas Gerais · 2000–2004Studies
Centro Federal de Educação Tecnológica de Minas Gerais · 1999–2000Studies
Colégio Militar de Belo Horizonte · 1994–1998Languages
- Portuguese — Native or bilingual
- English — Native or bilingual
- German — Limited working proficiency
Based on my LinkedIn profile. View profile ↗