EN · PROFILE
Service overview
Capabilities, areas of work and technical focus in a structured overview. A starting point for assessing which experience is relevant to your requirements.
Open service overviewQUALIFICATIONS · EXPERIENCE · EVIDENCE
Expertise you can verify.
A solid foundation in IT. Years of hands-on experience. Evidence you can review yourself. Explore my certifications, original PDFs and professional documents – clearly organised and directly accessible.
Lukas Günther TeisslIT-Consulting & Software Development
65+documented certificate records
15+years of practical IT experience
17linked original PDFs
67images in the evidence gallery
01 / THE PROFESSIONAL PICTURE
More than individual certificates.
A sound decision starts with a fuller picture. The service overview, résumé and external evidence reveal different aspects of my professional experience and provide a useful basis for discussing your project.
EN · PROFILE
Résumé
Professional roles, qualifications and practical experience in context. For decision-makers and project leads who want to understand the career behind the expertise.
View résuméCREDLY
Digital badges
Supplementary evidence through Credly. Review the issuer, qualification and any validity details directly in the relevant badge.
Open Credly profileThe documents open externally in a new tab. PDFs can be downloaded using your browser’s save function.
02 / TECHNOLOGY BREADTH
An interconnected view of IT.
Software, infrastructure and operations do not work in isolation. The documented qualifications cover several technology areas – a useful background for understanding requirements across individual products and system boundaries.
01
Microsoft & enterprise platforms
Databases, server infrastructure, web development and productivity solutions are a focus of the documented qualifications. The records show the technology building blocks represented in this profile across different product generations.
02
Software, web & e-commerce
From web applications to storefront interfaces, the collection spans different development environments and platforms. It provides context for the breadth of the technical background, alongside the custom developments presented separately.
03
Linux, systems & identities
Linux administration and identity management are further documented topics. In a project, these areas can matter where applications, user administration, permissions and system operations meet.
04
Networks & technical security
Vendor evidence in networking, video and security-related areas complements the software perspective. The source page includes further vendor sections, including Cisco, for a more targeted review.
05
Virtualisation & platform operations
Virtual infrastructure, application delivery and database platforms form another group of topics. The documents identify the relevant technology and product generation, allowing a more nuanced assessment.
06
Business systems & IT service
IBM and Apple records add further vendor perspectives to the collection. The areas represented include enterprise systems, IT service, support and interaction between different platforms.
From credentials to your actual requirements.
The introductory conversation is not about collecting as many certificates as possible. It is about your project: which systems are in place, where the technical dependencies lie, and which experience is relevant to delivery. The result is a considered assessment rather than a blanket promise.
03 / ORIGINAL DOCUMENTS
The PDF & evidence centre.
17 selected original PDFs from the existing collection, grouped by vendor with complete certificate titles and additional context. Open a category and choose the document you wish to review.
Microsoft3 PDFs
Microsoft Certified Professional
Vendor certificate as a Microsoft Certified Professional. A foundational credential within the documented Microsoft qualifications.
Open original PDFPDF · Original source: teissl.info
MCSE: Data Platform
Evidence relating to the Microsoft data platform and SQL Server solutions. The original document records the qualification at the time and its stated validity information.
Open original PDFPDF · Original source: teissl.info
Microsoft Certified IT Professional: Office 365
Qualification for the Office 365 generation specified in the certificate. Part of the documented profile in Microsoft platforms and administration.
Open original PDFPDF · Original source: teissl.info
Magento3 PDFs
Magento Certified Developer
Certificate in Magento development. Accessible evidence relating to technical work with the e-commerce platform specified in the document.
Open original PDFPDF · Original source: teissl.info
Magento Certified Developer Plus
Advanced Magento development credential. Complements the Developer certificate with the specialisation defined by the original certification programme.
Open original PDFPDF · Original source: teissl.info
Magento Certified Front End Developer
Front-end certificate for Magento. Documents the corresponding qualification area for the design and implementation of storefront interfaces.
Open original PDFPDF · Original source: teissl.info
Linux1 PDF
LPIC-1 Linux Professional Institute
LPIC-1 credential from the Linux Professional Institute. The verification details published on the source page provide a further way to check the PDF evidence.
Open original PDFPDF · Original source: teissl.info
VMware1 PDF
VMware Certified Associate 6 – Network Virtualization
VMware evidence focused on network virtualisation. The product generation and verification details are specified in the original certificate.
Open original PDFPDF · Original source: teissl.info
Oracle1 PDF
Oracle Database 12c: SQL Fundamentals
Evidence of SQL fundamentals in Oracle Database 12c. Complements the documented Microsoft database qualifications with another technology platform.
Open original PDFPDF · Original source: teissl.info
Adobe1 PDF
Adobe Certified Expert – ColdFusion 9
Adobe Certified Expert evidence for ColdFusion 9. A historical qualification in server-side web and application development.
Open original PDFPDF · Original source: teissl.info
SUSE / Linux1 PDF
SUSE Linux Enterprise Server 11
SUSE evidence for the Enterprise Linux 11 generation. The PDF adds the vendor qualification documented in the original to the Linux records.
Open original PDFPDF · Original source: teissl.info
NetIQ1 PDF
Certified NetIQ Identity Manager Administrator
Evidence relating to NetIQ Identity Manager administration. Categorised under identities, user administration and technical access processes.
Open original PDFPDF · Original source: teissl.info
Apple1 PDF
Apple Certified Support Professional 10.10
Apple support evidence for version 10.10. Documents a vendor-specific qualification within the cross-platform IT profile.
Open original PDFPDF · Original source: teissl.info
Juniper1 PDF
JNCIA-E – Juniper Certified Associate
Juniper evidence for E-Series (JNCIA-E). The original includes a verification code, which is distinct from the separate CertManager ID.
Open original PDFPDF · Original source: teissl.info
Citrix1 PDF
Citrix Certified Administrator for Citrix XenApp 6
Administrator evidence for Citrix XenApp 6. A documented qualification area in centrally delivered applications and Citrix environments.
Open original PDFPDF · Original source: teissl.info
IBM1 PDF
IBM Certified Associate SmartCloud Control Desk V7.5
IBM Certified Associate evidence for SmartCloud Control Desk V7.5. Adds to the collection in enterprise IT and service-management platforms.
Open original PDFPDF · Original source: teissl.info
Axis1 PDF
Axis Certified Professional (German certificate)
German-language Axis diploma in network video. Refer to the original document for scope, issue date and validity.
Open original PDFPDF · Original source: teissl.info
04 / TRACEABLE SOURCES
Trust starts with evidence you can check.
A PDF, a digital badge and a vendor registry serve different purposes. Use the appropriate source to review the title, issuer and stated qualification status yourself.
Credly
Digital badges containing issuer and qualification information. An additional review path for the evidence published there.
Open Credly profileMicrosoft Transcript
Transcript details and further Microsoft evidence published on the source page. The linked vendor access may require additional steps.
Published verification details
Verification details on the source page
Transcript-ID: 1098353Access-Code: mcpteisslLinux Professional Institute
Published details relating to the LPIC credential. The source page combines the PDF and further verification access.
Published verification details
Verification details on the source page
LPI-ID: LPI000352132Code: m9xu42c3w7Apple
The source page lists registry access and the published authorisation code relating to the Apple records.
Published verification details
Verification details on the source page
Authorization Code: APPL21521Juniper Networks
The CertManager ID and verification code are different identifiers. The code is documented in the original PDF; further references are available on the source page.
Published verification details
Verification details on the source page
CertManager-ID: JPR00254288Verification code: E80FLKWSW1Q45CXMCisco, Citrix & more
Further vendor sections and attachments are available on the source page. Some authorisation codes are explicitly offered only on request.
Verification details on the source pageVerification pages may change or require additional information. Links to the source page are labelled accordingly; they do not replace a current confirmation by the vendor.
05 / VISUAL DOCUMENTATION
The certificate gallery.
67 existing images complement the linked PDF files. Documents are shown in full without cropping. Open a preview to enlarge it; expand additional groups when needed.
More evidence images 9–20
More evidence images 21–32
More evidence images 33–44
More evidence images 45–56
More evidence images 57–67
Image numbers are for navigation, not certificate numbers. This is an image collection; several images may relate to the same qualification. Original images open in a new tab. All document groups remain accessible without custom JavaScript.
06 / USEFUL CONTEXT
Questions about the evidence.
Key points for a well-informed assessment, from historical certificate validity to evidence for a specific project.
Request further evidenceAre all certificates currently valid?
This page documents qualifications earned across several phases of technology. Some evidence relates to older products or time-limited certification programmes. Assess current status using the information in the original document and, where available, the issuer’s own records.
How can I download a certificate?
Open the vendor category in the PDF centre and then the original PDF you need. Your browser’s PDF viewer lets you save or print the file. Original files remain hosted on teissl.info, so downloading depends on that source being available.
What is the difference between a PDF, badge and evidence image?
A PDF presents a document from the collection. A digital badge can provide further information from the issuing service or vendor. The gallery makes visual browsing easier and opens existing images in full. The number of PDFs or images is not the same as the number of distinct certifications.
Why do some documents say “Guenther Teissl”?
Some professional documents and certificates use the name Günther Teissl or Guenther Teissl. They belong to the profile of Lukas Günther Teissl presented here. When reviewing evidence, consider the issuer and qualification details alongside the name.
Are further documents and vendor verification paths available?
Yes. The PDF centre is a selected extract. The linked source page includes additional attachments and vendor sections. Published verification details are included in the verification section; please get in touch for further evidence relevant to a particular project.
How can I assess the experience relevant to my project?
Start with the service overview and résumé. The custom developments provide additional insight into implemented systems. During an introductory call, we can then clarify which tasks, technologies and evidence matter most for your project.
YOUR PROJECT COMES FIRST
Let’s discuss the right solution.
Looking for technical support and interested in the experience behind the documents? In a no-obligation introductory call, we can discuss your situation, the evidence you need and a sensible next step.