# Sebastian Selinger - Full Profile > System Administrator at the University of Freiburg, Owner of Selinger Consulting (IT Consulting), and QA Expert with 10+ years of professional experience. Based in Freiburg, Germany. Available for projects in the DACH region. ## Professional Summary Sebastian Selinger is a versatile IT professional combining system administration, IT consulting, and quality assurance expertise. His career spans enterprise IT infrastructure at one of Germany's most prestigious universities, independent consulting delivering measurable results for businesses, and specialized QA work for international technology companies including Microsoft, Netflix, and Amazon. ## Professional Pillars ### 1. University of Freiburg - System Administration - Role: System Administrator - Responsibilities: High-availability IT infrastructure for 25,000+ users, server administration, network operations, virtualization, IT security - Technologies: Linux, Windows Server, Networking, Virtualization (VMware, Proxmox), Monitoring (Zabbix, Grafana) - Context: Albert-Ludwigs-Universität Freiburg, one of Germany's leading research universities ### 2. Selinger Consulting - IT Consulting - Role: Owner / IT Consultant - Focus: Strategic IT consulting with measurable ROI for businesses - Services: Infrastructure analysis, technology advisory, security audits, IT governance, compliance, process optimization - Technologies: Cloud solutions (AWS, Azure), Docker, CI/CD, Ansible, Terraform - Area: DACH region (Germany, Austria, Switzerland) ### 3. Quality Assurance - QA Expert - Role: QA Expert specializing in enterprise software and security research - Specializations: Enterprise software testing, test automation, security research, compliance testing - Technologies: Selenium, Cypress, manual testing methodologies - Recognition: Bug bounty acknowledgments from Microsoft, Netflix, Amazon ## Work Experience ### University of Freiburg - System Administrator (current) Managing IT infrastructure for one of Germany's leading research universities. Ensuring high availability, IT security, and reliable operations for 25,000+ users. ### Selinger Consulting - Owner & IT Consultant (current) Strategic IT consulting for businesses in the DACH region. Infrastructure optimization, security audits, and technology advisory with focus on measurable outcomes. ### XboxDev - Founder & Editor (2016 - present) Founded and manages a community platform with user management and content delivery systems. ### Keywords Studios - QA Tester (2017 - present) Project-based testing for international technology companies as part of the Global Beta Test Network. ### Realworld One - QA Tester (01/2022 - 12/2022) Quality assurance for enterprise e-learning software including augmented and virtual reality platforms. ### Ubisoft - QA Tester (10/2020 - 10/2022) Ad-hoc and regression testing of business-critical software products for an international technology company. ### Scientific Games - QA Tester (01/2023) Quality assurance for enterprise software applications. ### Freelance Development / QA (2016 - present) Independent consulting and development work including web development and quality assurance projects. ## Notable Collaborations - **Microsoft** - Insider Programs: Pre-testing & QA for Windows, Xbox, and HoloLens platforms. Bug bounty recognition. - **Ubisoft** - Enterprise QA: Technical alpha and MVP testing for international software products - **Netflix** - Security Research: HDCP vulnerability analysis. Security research recognition. - **Amazon Prime Video** - Security Research: HDCP implementation vulnerability analysis. Security research recognition. - **Keywords Studios** - Global QA: Enterprise software testing for international clients - **Blue Byte (Ubisoft)** - Software Testing: QA for strategy and simulation software - **HashiCorp** - Technical Translation: Translation of technical documentation for enterprise DevOps tools - **Realworld One** - Enterprise QA: Quality assurance for e-learning platforms - **Adition Technologies AG** - AdTech: Programming, testing, and documentation for advertising technology - **Virtual Minds AG** - Digital Marketing: QA for marketing technology platforms - **Viadux** - Operations Software: QA for operations control system software - **DAQA** - Software Testing: QA for enterprise software products - **TurboAd GmbH** - AdTech: Quality assurance for advertising technology ## Technical Skills ### System Administration - Linux / Unix: Expert level - Windows Server: Advanced - Networking & Security: Advanced - Virtualization (VMware, Proxmox): Advanced - Monitoring (Zabbix, Grafana): Advanced - High Availability & SLA Management: Advanced ### Development - Python: Advanced - JavaScript / Node.js: Advanced - Bash / Shell Scripting: Expert level - HTML / CSS: Advanced - React: Intermediate ### QA & Testing - Manual Testing: Expert level - Test Automation (Selenium, Cypress): Advanced - Security Testing & Research: Advanced - Compliance Testing: Advanced ### Tools & DevOps - Docker / Containerization: Advanced - CI/CD (Jenkins, GitHub Actions): Advanced - Git / Version Control: Expert level - Ansible, Terraform: Intermediate - AWS, Azure: Intermediate - Nginx, Apache: Advanced - PostgreSQL, MySQL, Redis: Intermediate ## Services Offered ### IT Consulting & Strategic Advisory Strategic consulting for IT decisions including infrastructure analysis, technology advisory, security audits, IT governance, compliance, and process optimization. Focus on measurable outcomes and clear ROI. ### System Administration & Infrastructure Professional management and optimization of IT systems and network infrastructure. Server management, networking, cloud solutions, monitoring, high availability, incident response, and SLA management. ### Quality Assurance & Testing Comprehensive quality assurance for enterprise software: test automation, security research, compliance testing, and software quality management for international technology companies. ## Selected Projects - **XboxDev** (2018): Community platform with user management and content delivery systems - **Huskynarr.de** (2008): Long-running web project with multiple redesigns and technology migrations - **RBTV.info** (2016-2022): Community platform development and management - **Cologna** (2014-2024): 10-year operation of a web platform including acquisition, development, and user management - **Gamescom Countdown** (2018-2023): Automated event platform with Discord and Twitter bot integration - **HDCP PoC**: Security research on HDCP implementation vulnerabilities (Netflix, Amazon) - **Gamescom Survival Guide** (2020): Published guide on Amazon ## Contact Information - Website: https://sebastianselinger.de - LinkedIn: https://www.linkedin.com/in/SebastianSelinger/ - GitHub: https://github.com/Huskynarr - XING: https://www.xing.com/profile/Sebastian_Selinger - Contact Form: https://sebastianselinger.de/#contact ## Location Freiburg, Baden-Württemberg, Germany Available for projects in the DACH region (Germany, Austria, Switzerland) ## Languages - German (Native) - English (Professional)