AST Auto Service Teltow
Website for the master car workshop just outside Berlin: every service from inspection to tuning, appointment requests in two clicks and 5-star reviews as the eye-catcher – built for customers who book from their phone.
IT services for businesses in Berlin & Brandenburg
The IT department for Berlin businesses that don't have one.
Your dedicated IT contact, on site and remote.
Projects for
- AST
- Korff
- Haus Phönix
- BSU-Holding
Services
Six areas, one contact.
You don't need to know which area solves your problem. We'll work that out in the consultation, and then you get a fixed price.
01Keeping day-to-day running
- IT supportOne dedicated contact for workstations, printers, software and everything else that gets stuck at the office.
- Network & serversSecure networks, Wi-Fi, VPN and Windows Server that grow with your business.
- IT securityBackups, updates, access rights and training, so one wrong click doesn't bring your whole business to a halt.
02When you need something new
- WebsitesFast, secure websites that represent your business well and bring in enquiries from mobile.
- Web appsWeb apps, portals and integrations that replace Excel lists and email chains. You own the source code.
- Local AIAI that works on your own documents and stays in-house: GDPR-compliant and with sources cited.
Not sure what you need?
Briefly describe what's not working. I'll tell you honestly what makes sense, and what doesn't.
Free · no sign-up
Two free checks for your business
About 2 minutes, no account, instant results. Get the detailed report by email if you like.
IT security check
How secure is your IT?
10 questions on backups, updates, passwords and incident planning
How is your company's data backed up?
Website check
How healthy is your website?
Load time · SSL · Security · Accessibility
Room for improvement
- Load time
- Security settings
- Accessibility
- SSL & encryption
References
Projects that speak for themselves.
Websites for a car workshop and a law firm, eight workstations in one Entra ID domain and a local AI that searches company documents.
Anwaltskanzlei Korff
A trustworthy presence for criminal law and defence in Berlin: clear structure, a prominent emergency contact and confidence from the very first click.
Entra ID & domain for Haus Phönix
Set up a new domain and eight computers across all office rooms: one login for everything, centrally managed.
GDPR-compliant RAG system for BSU-Holding
The company's own AI searches contracts and past quotes and turns them into draft quotes. Every answer cites its source.
About me
IT with a face and a name
One person, not a hotline
I'm Markus Lindner, founder of Lindner Tech. As a freelancer I look after small and medium-sized businesses in Berlin & Brandenburg with everything IT, and you always deal with me directly.
From 2019 to 2024 I worked at Siemens AG in Berlin on IT infrastructure, monitoring with the ELK stack and automation with PowerShell and Python. In 2026 I passed the final exam as an IT specialist for application development at IHK Berlin.
I combine system administration with software development: Windows Server, networks and Microsoft 365 on one side, websites, web apps and local AI on the other. I grew up speaking German and Polish, I also advise in English, and I come to your office when something has to be done on site.
Qualifications & certificates
CV and certificates (PDF)IT specialist for application development
IHK Berlin, final exam passed in 2026
5 years at Siemens AG
IT infrastructure, ELK stack monitoring and automation, 2019–2024
Siemens Cybersecurity
Data Privacy, Network Hardening, IT Regulation
Microsoft Azure & 365
Hands-on: VNets, Active Directory, daily administration
Python 3 – Top 1%
CodinGame certification, worldwide
C++ – Top 2%
CodinGame certification, worldwide
Why Lindner Tech
What you can count on
One dedicated contact
You always reach me, not a call centre or a ticket system. I know your devices, your logins and the way you work.
Fixed price after the consultation
Before I start, you know what I'll do and what it costs. No timesheets, no surprises.
On site in Berlin & Brandenburg
When something has to be done on site, I come to your office. A lot can be handled remotely, so you don't have to wait for a visit.
Deutsch, Polski, English
I grew up speaking German and Polish, and I also advise in English. On request, I write guides for your team in the language they speak.
Enterprise experience, properly documented
Five years at Siemens AG showed me how IT runs properly in large environments. That's why I document every setup and hand it over to you.
How it works
Five steps to IT that just works.
We talk first, then you get a fixed price. I only start once you say yes.
Step 1 of 5
15-minute call
You tell me on the phone what's not working or what you're planning. I listen and tell you honestly what makes sense.
- Free, no obligation
- In German, Polish or English
- Callback within 24 hours on weekdays
Step 2 of 5
Assessment
I look at your IT on site or remotely: devices, network, accounts, backups or website, depending on what it's about.
- On site or remote
- What works, what's missing, what's urgent
- Findings in plain language
Step 3 of 5
Fixed-price quote
You get a written quote with a clearly defined scope and a fixed price. Take your time to decide.
- Clearly defined scope
- Fixed price, no timesheets
- Larger projects in stages
Step 4 of 5
Implementation
Once you agree, I get to work, step by step and outside your core hours where possible, so your business keeps running.
- Outside your core hours where possible
- Step by step, not all at once
- Documented and handed over to you
Step 5 of 5
Ongoing support
Afterwards I stay your contact: for questions, updates and anything new that comes up.
- One dedicated contact, not a hotline
- Updates, backups and small changes on request
- We plan new projects together
No hotline, no ticket system. Just one person who knows your IT and calls you back.
5.0
Google rating
Average of 44 reviews on my Google Business Profile
5
Years at Siemens
IT infrastructure, monitoring and automation at Siemens AG in Berlin, 2019–2024
3
Languages
Advice in German, Polish and English
Top1%
Python worldwide
CodinGame certification, plus C++ in the top 2%
Client reviews
What clients say about working with me
Three of 44 reviews on my Google Business Profile, quoted word for word.
on Google
44 reviews
Contact
Let's talk about your IT.
Send me a short note about what you need, or give me a call. One sentence is enough, we'll sort out the rest on the phone.
Markus Lindner
Your contact at Lindner Tech
You talk to me directly. No call centre, no ticket system.
What happens next
You write or call
I get back to you within 24 hours on weekdays
A 15-minute call, no obligation, then a fixed-price quote if you want one
Prefer to call?
You'll speak to me directly. If I'm with a client, I'll call you back.
Free consultation
Three fields, one minute. I'll get back to you within 24 hours on weekdays.
Blog & insights
IT know-how without the jargon
Deadlines, security, websites and AI: articles for managing directors and office managers, in plain language and with concrete next steps.
Latest article
12/01/2027
End of extended support
Windows Server 2016: End of Support on 12 January 2027
Extended support for Windows Server 2016 ends on 12 January 2027. When ESU works as a bridge, three ways forward for your server and a checklist.
All articles
- Windows 10 ESU: What Small Firms Need to Do
- Getting a Website Built: What Determines the Price and What to Look For
- Microsoft Entra ID for Small Businesses: One Login for Everything Instead of Sticky Notes
- Local AI for Your Business: How a GDPR-Compliant RAG System Works
- AI in Small Businesses: Where It Really Saves Time – and Where It Just Adds Work
- Germany’s Accessibility Act: When Your Website Must Comply – and What That Means
- How to Spot Phishing: A Guide for Your Team
- The 3-2-1 Rule: Backups That Actually Work When It Matters
- IT Security for Law Firms: 5 Measures with Immediate Impact
Missing a topic? Tell me what you'd like to know more about. It may become the next article.
Suggest a topicFAQ
What businesses often ask me
Can't find your question? Call me or send a short message.
How does the free consultation work?
Send me a short message or give me a call, and I'll get back to you within 24 hours on weekdays. Then we talk on the phone for 15 minutes about what you need, free and with no obligation. If it's a fit, I take a closer look at your IT, and afterwards you get a fixed price.
Do you come to the office or work remotely?
Both. Updates, accounts and settings can often be handled remotely, which is quicker. For hardware, networks and new workstations I come to you in Berlin & Brandenburg.
Is it worth it for a small business with just a few PCs?
Yes, that's exactly what Lindner Tech is for. My clients are mostly small businesses without their own IT department, such as a law firm or a car workshop. You still get one dedicated contact who knows your devices and logins.
What does it cost?
That depends on the scope, so there's no price list. After the consultation and a short assessment, you get a fixed price for a clearly defined scope. I only start once you've agreed.
Which languages do you work in?
German, Polish and English. I grew up with German and Polish and speak English fluently. On request, I write guides for your team in the language that suits them.
How quickly do you get back to me?
I reply to enquiries within 24 hours on weekdays. For ongoing support, we agree together on how quickly I respond when something breaks.
What happens to our data, for example with AI?
I run local AI on your own hardware or on servers in the EU, so your company knowledge doesn't end up with an AI provider. If I process data on your behalf, we sign a data processing agreement under Art. 28 GDPR.
Which areas do you cover?
IT support for your office, networks and Windows Server, IT security, websites, custom software and web apps, and local AI. I work only for businesses, self-employed professionals and organisations. If your request doesn't fit, I'll tell you honestly.