{
  "$schema": "https://raw.githubusercontent.com/jsonresume/resume-schema/v1.0.0/schema.json",
  "basics": {
    "name": "Denis Hierholzer",
    "label": "IT Systems Engineer",
    "url": "https://www.hierholzer.us",
    "summary": "Since 2007 I have worked as a Systems Engineer, focusing on Windows servers, Active Directory, backup, virtualization, patch management and monitoring. I also work with Linux servers, develop small applications and plugins (Python, C#, Java) and love automating tasks with scripting (PowerShell, Bash, Batch, VBS).\n\nFor some time now I have been working with AI, both cloud-based and local, for coding, retrieval-augmented generation (RAG), agents and more. I write detailed technical documentation for administrators and end users.\n\nContinuing education matters to me, which is why I regularly earn certifications and attend IT courses. I am proactive, punctual and highly organized. In my spare time I extend my own IT lab and explore new applications and services.",
    "location": {
      "city": "Klettgau",
      "postalCode": "79771",
      "countryCode": "DE"
    },
    "profiles": [
      {
        "network": "LinkedIn",
        "username": "denishierholzer",
        "url": "https://www.linkedin.com/in/denishierholzer/"
      },
      {
        "network": "Xing",
        "username": "Denis_Hierholzer",
        "url": "https://www.xing.com/profile/Denis_Hierholzer"
      }
    ]
  },
  "work": [
    {
      "name": "Cilag AG – a Johnson & Johnson company",
      "position": "IT Infrastructure Engineer",
      "url": "https://www.cilag.ch",
      "location": "Schaffhausen, Switzerland",
      "startDate": "2021-03",
      "summary": "Engineering and administration of the entire Schaffhausen OT infrastructure (LAN, firewalls, Linux and Windows servers, SAN).",
      "highlights": [
        "Active Directory",
        "Application streaming",
        "Artificial Intelligence (AI)",
        "Backup and archiving",
        "Cisco ACI, classic routing and switching",
        "Scripting (PowerShell and others)",
        "Application development (Python)",
        "Virtualization",
        "OT cyber security (micro-segmentation, vulnerability management)",
        "Introduction of Cisco ACI: Replaced the Cisco SG500 core with an ACI spine/leaf fabric and introduced a new security zoning concept.",
        "Introduction of Veritas NetBackup: NetBackup 9.1 on Red Hat 8.5 with a Dell ML3 tape library, iSCSI SAN, deduplication and tape encryption."
      ]
    },
    {
      "name": "Syntegon Technology Services AG",
      "position": "IT Systems Engineer",
      "url": "https://www.syntegon.com",
      "location": "Beringen, Switzerland",
      "startDate": "2020-06",
      "endDate": "2021-02",
      "summary": "Engineering and coordination of multiple infrastructure projects with a focus on networking (WAN, LAN, WLAN, DMZ, firewalls) and automation with PowerShell.",
      "highlights": []
    },
    {
      "name": "Schroder & Co Bank AG",
      "position": "Lead Network and Security",
      "url": "https://www.schroders.com",
      "location": "Zurich, Switzerland",
      "startDate": "2014-06",
      "endDate": "2020-05",
      "summary": "IT Operations department.",
      "highlights": [
        "Administration and installation of Windows, Solaris, network and security systems",
        "Operation of the T24 core banking application",
        "VMware infrastructure including automated failover",
        "System Center (SCCM, SCOM)",
        "Security systems (DRM, DLP, Palo Alto and Check Point firewalls, privileged access management)",
        "Process automation with PowerShell, e.g. a user account lifecycle tool",
        "Automated disaster recovery: Automatic failover of the virtual infrastructure to the DR site.",
        "Firewall migration: Migrated proxy rules from Blue Coat ProxySG 600-20 to Palo Alto 5020 with Panorama and reduced the rule base by more than 50%.",
        "User lifecycle automation: Modular PowerShell automation for user termination with HR/AD synchronisation and password-expiry notifications.",
        "Data classification and encryption: AD RMS-based file classification and encryption (IQProtector) to meet FINMA requirements.",
        "AppLocker rollout: AppLocker rollout with a self-developed GUI tool \"AppLocker Mgmt Pro\" that writes events to SQL Server.",
        "PowerShell tooling: About ten tools, including a GUI for folder permissions, weekend wake/shutdown, RSA token provisioning, an Outlook button for SCSM tickets and the help desk tool \"TSTool3\".",
        "Infrastructure modernisation: Migrated VBS logon scripts to group policies and DHCP to Windows Server 2012 R2."
      ]
    },
    {
      "name": "Dentsu Holdings USA / 360i",
      "position": "Senior Systems Administrator / Systems Engineer",
      "url": "https://360i.com",
      "location": "New York City, USA",
      "startDate": "2012-12",
      "endDate": "2014-03",
      "summary": "Corporate IT managing about 10 branches and more than 300 servers worldwide in a mixed Windows/Linux environment.",
      "highlights": [
        "Windows and Linux servers, VMware vSphere, Active Directory",
        "SCCM, WSUS, McAfee ePO",
        "Redmine, Atlassian Jira and Confluence",
        "EMC NetWorker, Microsoft Exchange",
        "Microsoft SQL Server including clustering, Apache Subversion including replication",
        "Several PowerShell and VBS applications",
        "Active Directory maintenance framework: Modular framework with more than 1,500 lines of code.",
        "Client management at scale: SCCM 2012 for 800+ workstations; WSUS for about 150 servers and 900+ workstations at 10 sites.",
        "BitLocker: Disk encryption managed with SCCM, TPM and Active Directory.",
        "More: Introduced Redmine, SQL Server failover cluster, McAfee anti-virus infrastructure, server inventory application, WordPress and SilverStripe site migration."
      ]
    },
    {
      "name": "Bomatec AG",
      "position": "IT Officer",
      "url": "https://www.bomatec.ch",
      "location": "Höri, Switzerland",
      "startDate": "2011-01",
      "endDate": "2012-10",
      "summary": "Responsible for all IT including project management.",
      "highlights": [
        "Network services, help desk, newsletter operations",
        "Windows 7 clients, Windows Server 2008 R2",
        "Exchange 2010, Lync 2010, SQL Server",
        "SAN, backup and ERP systems",
        "Windows 7 migration: Migration to Windows 7 64-bit with SCCM.",
        "Backup concept: Grandfather-father-son backup with Symantec Backup Exec 2012 and an HP tape autoloader.",
        "More: Wi-Fi improvements and a new newsletter process."
      ]
    },
    {
      "name": "Bucher Hydraulics",
      "position": "Systems Administrator / Systems Engineer",
      "url": "https://www.bucherhydraulics.com",
      "location": "Klettgau, Germany",
      "startDate": "2007-09",
      "endDate": "2010-12",
      "summary": "Central IT managing 16 branches and about 100 servers worldwide.",
      "highlights": [
        "Entire Lotus Notes / Domino infrastructure including the migration from version 7 to 8",
        "Development and improvement of Notes applications",
        "Infrastructure projects: Corporate mobile device concept, P2V server migrations, video conferencing, Trend Micro anti-virus, WSUS patch management and an AD migration after a takeover."
      ]
    },
    {
      "name": "eschbach IT GmbH",
      "position": "Web Developer (Diploma Thesis)",
      "url": "https://www.eschbachit.com",
      "location": "Bad Säckingen, Germany",
      "startDate": "2007-03",
      "endDate": "2007-08",
      "summary": "Diploma thesis \"Conception and implementation of a Rich Internet Application based on an existing intranet application\" (PHP, AJAX), the basis of today's Shiftconnector.",
      "highlights": []
    },
    {
      "name": "Micronas GmbH",
      "position": "Systems Administrator (Student Apprentice)",
      "location": "Freiburg, Germany",
      "startDate": "2006-03",
      "endDate": "2006-08",
      "summary": "Network administration, second-level support, server administration, scripting.",
      "highlights": []
    },
    {
      "name": "Harman/Becker Automotive Systems GmbH",
      "position": "Systems Administrator and First-Level Support (Student Apprentice)",
      "location": "Stuttgart area, Germany",
      "startDate": "2004-09",
      "endDate": "2005-02",
      "summary": "Network administration, first-level support, application development.",
      "highlights": []
    },
    {
      "name": "Textilbüro Weissenberger GmbH",
      "position": "Database Developer (Freelance)",
      "location": "Klettgau, Germany",
      "startDate": "2002-08",
      "endDate": "2002-09",
      "summary": "Microsoft Access database for order processing.",
      "highlights": []
    }
  ],
  "volunteer": [
    {
      "organization": "Gemeindebücherei Klettgau (public library)",
      "position": "Volunteer Systems & Web Administrator",
      "url": "https://www.gemeindebuecherei-klettgau.de",
      "startDate": "2002-01",
      "endDate": "2020-07",
      "summary": "User support, system administration (Windows Small Business Server 2003, Exchange, library software), and development of the public website. Officially honoured for volunteer work in January 2017."
    }
  ],
  "education": [
    {
      "institution": "Hochschule Furtwangen University",
      "url": "https://www.hs-furtwangen.de",
      "area": "Computer Networking",
      "studyType": "Diplom-Informatiker (FH)",
      "startDate": "2003",
      "endDate": "2007",
      "score": "1.8 (A-)",
      "courses": [
        "Internal Structure of Linux",
        "Shell Programming",
        "UNIX Lab",
        "English – Area & Culture Studies (UK & USA)",
        "English – Business Communication",
        "Effective Java",
        "Java Security + Lab",
        "Network Management – Analysis and Tools + Lab",
        "Network Management – Technologies and Processes",
        "Electronics for Computer Scientists",
        "Mathematics 1 (Analysis)",
        "Networks 1",
        "Programming 1 + Lab",
        "Scientific Work Methods",
        "Algorithms and Data Structures + Lab",
        "Mathematics 2 (Linear Algebra)",
        "Mathematics 3 (Structures)",
        "Networks 2",
        "Presentation Techniques",
        "Programming 2 + Lab",
        "Software Engineering + Lab",
        "Theoretical Computer Science (Logic)",
        "Business Administration 1",
        "Databases + Lab",
        "Network Programming + Lab",
        "Networks 3 + Lab",
        "Computer Architecture",
        "Software Applications Architecture",
        "Systems Software 1",
        "Business Administration 2",
        "Project Management",
        "Systems Software 2 + Lab",
        "Computer Science and Society",
        "Current Topics in Computer Science",
        "Management",
        ".NET",
        "Application Server",
        "C#",
        "Collaborative Systems",
        "Design Patterns",
        "Middleware Lab",
        "Mobile in the Internet",
        "Cellular Networks",
        "System Administration Project",
        "Distributed Objects"
      ]
    },
    {
      "institution": "Gewerbliche Schulen Waldshut – Technical High School (Information Technology)",
      "url": "https://www.gewerbliche-schulen-waldshut.de",
      "area": "Information technology",
      "studyType": "Abitur",
      "startDate": "2000",
      "endDate": "2003",
      "score": "1.9 (A-)",
      "courses": []
    }
  ],
  "certificates": [
    {
      "name": "Claude Code Masterclass",
      "date": "2026-11",
      "url": "https://zertifizierung.kiberatung.de/verify/8d17447f-9c4e-44f2-9295-4a51f7f7262f"
    },
    {
      "name": "CISSP – Certified Information Systems Security Professional",
      "date": "2025-11",
      "issuer": "ISC2",
      "url": "https://www.credly.com/badges/df414fc9-98eb-4e39-82e5-4562b5ccb1ba/public_url"
    },
    {
      "name": "Fitness Trainer B-License",
      "date": "2024-05"
    },
    {
      "name": "Cisco Certified Specialist – Enterprise Core",
      "date": "2019-07",
      "issuer": "Cisco"
    },
    {
      "name": "LPIC-1 Linux Administrator",
      "date": "2018-11",
      "issuer": "Linux Professional Institute",
      "url": "https://www.lpi.org/v/LPI000278048/bc3atl5nuw"
    },
    {
      "name": "Check Point Certified Security Administrator (CCSA) R80",
      "date": "2018-08",
      "issuer": "Check Point"
    },
    {
      "name": "Palo Alto Networks Accredited Configuration Engineer (ACE) PAN-OS 7.0",
      "date": "2017-02",
      "issuer": "Palo Alto Networks"
    },
    {
      "name": "Cisco Certified Network Associate Security (CCNA Security)",
      "date": "2016-11",
      "issuer": "Cisco"
    },
    {
      "name": "Certified Ethical Hacker (CEH v9)",
      "date": "2016-04",
      "issuer": "EC-Council",
      "url": "https://aspen.eccouncil.org/Verify"
    },
    {
      "name": "Oracle Certified Associate, Oracle Solaris 11 System Administrator",
      "date": "2015-11",
      "issuer": "Oracle"
    },
    {
      "name": "Intensive Course Banking Fundamentals",
      "date": "2015-01",
      "issuer": "Fachschule für Bankwirtschaft"
    },
    {
      "name": "Cisco Certified Network Associate Routing & Switching (CCNA R&S)",
      "date": "2013-12",
      "issuer": "Cisco"
    },
    {
      "name": "Cisco Certified Entry Networking Technician (CCENT)",
      "date": "2013-11",
      "issuer": "Cisco"
    },
    {
      "name": "VMware Certified Associate – Data Center Virtualization (VCA-DCV)",
      "date": "2013-11",
      "issuer": "VMware"
    },
    {
      "name": "Microsoft Certified Solutions Associate – Windows Server 2008 (MCSA)",
      "date": "2012-05",
      "issuer": "Microsoft"
    },
    {
      "name": "Microsoft Certified IT Professional – Server Administrator (MCITP:SA)",
      "date": "2012-05",
      "issuer": "Microsoft"
    },
    {
      "name": "IBM Certified System Administrator – Lotus Notes and Domino 8.5",
      "date": "2010-08",
      "issuer": "IBM"
    },
    {
      "name": "Cambridge Certificate in Advanced English (C1)",
      "date": "2009-12",
      "issuer": "University of Cambridge"
    },
    {
      "name": "IBM Certified System Administrator – Lotus Notes and Domino 8.0",
      "date": "2009-10",
      "issuer": "IBM"
    },
    {
      "name": "Certified Data Protection Officer (IHK)",
      "date": "2008-09",
      "issuer": "IHK"
    }
  ],
  "languages": [
    {
      "language": "German",
      "fluency": "Native speaker"
    },
    {
      "language": "Swiss German",
      "fluency": "Native speaker"
    },
    {
      "language": "English",
      "fluency": "Full professional proficiency (C1)"
    },
    {
      "language": "French",
      "fluency": "Basic knowledge"
    }
  ],
  "skills": [
    {
      "name": "OT Security"
    },
    {
      "name": "Cisco ACI"
    },
    {
      "name": "AI"
    },
    {
      "name": "Python"
    },
    {
      "name": "PowerShell"
    },
    {
      "name": "Veritas NetBackup"
    },
    {
      "name": "Networking"
    },
    {
      "name": "Firewalls"
    },
    {
      "name": "Palo Alto"
    },
    {
      "name": "Check Point"
    },
    {
      "name": "VMware"
    },
    {
      "name": "Security"
    },
    {
      "name": "SCCM"
    },
    {
      "name": "SQL Server"
    },
    {
      "name": "Linux"
    },
    {
      "name": "Windows Server"
    },
    {
      "name": "Exchange"
    },
    {
      "name": "Backup"
    },
    {
      "name": "Lotus Domino"
    },
    {
      "name": "WSUS"
    }
  ],
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    "lastModified": "2026-11-06T09:20:18.812Z"
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}