Security Architect, Hacker, Trainer

A great seminar. Please keep the content and methodology unchanged!

Very strong expertise — responded very well to follow-up questions.

Thank you very much for your training! It was very interesting and packed with knowledge. People on the team learned a lot and speak about it positively.

From my side, thanks again for running the training. Participant feedback was positive across the board, always with the note that the training fits our company well.

Thank you so much for such an interactive session — really enjoyed it and learned a lot.

Very strong on content — excellent presentation.

Thank you so much for the valuable input. Especially the insights about agentic AI security were very helpful.

Just wanted to share feedback on the past three days: the training matched my expectations exactly. The topics covered and the mix of practical and theoretical parts were perfect. Your years of experience really show.

Time well spent! Thanks a lot, I thoroughly enjoyed the training and depth of content.

Your passion for security is contagious :)

Thank you for the great training — it was exactly what I had in mind for my team! I expect we’ll repeat it with other employees soon.

Super exciting and varied! Thank you!

Thanks for the training! It was varied and the different interactive elements kept it engaging. We took away a lot! Looking forward to possible future collaboration.

This was my second time with you, Christian. Very interesting again and a lot of fun!

Thanks again for today’s session! I have to say, every time I’m impressed by how quickly you dive into complex topics, ask critical questions, and provide valuable input. Truly fascinating!

Thanks a lot for sharing such great insights with us!

I found the training overall very informative and helpful. The explanations were clear and well structured. Important security concepts were covered with plenty of examples to illustrate them. I took away a lot. Thank you for the training :)

Thanks a lot, I liked the format and the workshop as a whole very much, very engaging, great job, learned quite a bit.

Thanks a lot! Also for the brilliant explanations and well-presented practical examples!

Very intensive seminar, presented very clearly and well!

Insider knowledge from pentesting came through clearly. Broad coverage, strong expertise, and you tailored the content to the technologies we actually use. Technically, pedagogically, and personally excellent — you handled questions well and the structure worked really well.

Excellent example applications — you explain things very clearly.

Very high level of expertise! Pedagogically excellent. Interesting with lots of practical exercises. A seemingly “dry” but very important topic was conveyed and communicated really well.

Very interesting, very practical, engaging — and an answer to everything ;)

I really enjoyed the training thank you so much! 🙏 It was an interactive and insightful session. I became more aware of security tools and how to use them effectively. Thanks again for sharing such valuable insights with us. I really appreciate it!

Thank you Christian! Superb content and explanations, I learned a lot.

Participants were thrilled with the training — hardly any survey scores this well! We’re glad feedback was so positive and that participants got so excited about the topic! We really hope we’ll have the chance to work together again (and hopefully often) in the future!

Very practical, instructive, and pedagogically excellent! Had a blast!

Many topics were covered that were new to me and important for my work.

Thank you so much Christian, very informative, substantial and useful.

The training was absolutely excellent. I now have over 10 years of professional experience, and over all those years this is one of the best trainings I’ve ever attended.

Thanks again for the very, very good workshop today. I wanted to give big praise for your talks and your workshop — really well done! You just want to get started and try it yourself. Simply excellent!

Every developer should take this training at least once.

Many thanks! Really detailed and exciting!

I took part in the web security training last week. It was great again. You make it so vivid, and combined with your real-world stories it’s genuinely gripping. The training was really fun and made me want to learn more about the topic.

An exciting and inspiring event with a speaker who fully masters his subject area.

Thanks a lot, it was a very interesting and entertaining training!!! 🙌

Really amazing and brilliant course. Happy to have chosen your training. Thanks for all the preparations and for accommodating lots of questions after the time ;).

As the organizer, I received consistently positive feedback from participants. The real-world examples landed especially well, and defense in depth felt well placed.

I’d like to thank you again for the exciting training last week. The content was very well prepared and the training formed a cohesive package.

Your workshop at our company had real impact: many participants tried to find vulnerabilities in their projects — with success.

This was a mind-boggling workshop and I’d like to recommend you to colleagues from other companies.

Very helpful training. Very clear description of the attacks and things we need to take care of. Now we have a list of tasks to check/improve in our codebase.

Thank you again for the excellent intensive training this week.

Thank you Christian! Even though I’m not a developer, I could follow almost everything and learned a lot. Absolutely recommended!

I enjoyed and can highly recommend this training. Christian is an awesome educator and teacher.

First of all, heartfelt thanks for the three very inspiring days. I found your talk excellent both pedagogically and in terms of content. The many workshop exercises also contributed a lot to a better basic understanding of the theory.

Thank you for the great training! Had a lot of fun and I’ve already recommended it. The mix of theory, practice, and vivid case studies was perfect. You definitely leave the training with a sharper security mindset.

Mega great workshop! THANK YOU

Many heartfelt thanks. Excellently delivered and so many important pieces of information! I learned a lot of new things…

just one word: AWESOME! thank you!

Yes!! This should be mandatory for all software developers!

I would buy it again 5/5 stars :D

Great session Christian!!! Thanks a million!!!

It was great! Concrete examples, explained clearly — definitely left a lasting impression. Keep it up!!

The training made it tangible how hackers work in practice and which tools they have at their disposal. The concrete examples helped a lot.

I found the training comprehensive, VERY educational, highly interesting and exciting — and it really drives the point home. Remote participation was especially important for our team, and you mastered that format really well. The training had a clear narrative arc and clear business value. I’ll definitely recommend it. Thank you!

Really, really well done pentesting lecture. It was very informative and fun to learn about this stuff again. Since becoming a developer I stopped coding in my free time, but seeing how to break systems — and how and why they work — was part of why I became a programmer in the first place. So the child in me was so happy to learn about XML bombs and all the other crazy things!

Much was new to me (even after years in corporate IT). With the flood of attack possibilities, the framework with “code/data” and “source-taint-sink” is helpful, as is the calm delivery and “let them discover” approach. I recommend the training!

First of all: thank you for an excellent workshop. Feedback on the second part of the workshop was consistently positive. I’ve already heard from several teams that they want to use threat modeling in practice going forward. From my perspective, a complete success.

Very entertaining, interesting and inspiring two days of security training. Enjoyed it a lot and got curious about analyzing our code for weaknesses. Long live the Swiss cheese model! :-)

Thanks for the training. It was an eye-opener, especially the live hacking demonstrations.

Yes, it was really fun, especially the vivid way knowledge was conveyed, the practical examples, addressing every question, the detailed handout, and not least the pleasant atmosphere. Thank you!

We would like to thank you once again for enriching our summit as a speaker with your excellent talks. We collected initial participant feedback right after the event, and it was consistently positive.

I took part in your web security training over the past two days — it was awesome. I like the practical approach with the marathon app to try out different cases. Your slides and presentation style are really good and I learned a lot. You definitely know what you’re talking about and convey that knowledge well.

Great training — I had to file a bug for an app right away :D.

Very interesting training. Pedagogically well structured. Especially the step-by-step escalation of the attack, followed by a demonstration of automated off-the-shelf attack tools.

Thank you for the exciting time at the Web Security Bootcamp. With a high level of competence and “escape-the-room” flair, it was fascinating to look at vulnerable doors and gates from the attacker’s point of view, and to learn the many ways to keep those paths closed and secure. A training I can recommend 100% to every developer.

Thank you. I was a complete security beginner and now definitely have a different view of my source code. For many things I used to think mainly about clean code and good style, but it clearly also makes sense from a security perspective to separate data and code.

I loved that you encouraged people to ask questions. Unusual at first how often you did it, but that’s how questions actually get asked :)

I also loved that you had everything prepared so you could always work hands-on if you wanted. You could tell you have routine. At the same time it never got boring.

Great training! Not just technically strong, but also excellently delivered. There genuinely weren’t any dull moments. And with the handout you feel equipped for upcoming challenges.

It was great to always see how far you can take exploiting vulnerabilities!

The training was amazing. I’m quite new to security, and I was speechless at how many everyday systems can be broken when you know what to look for. WOW. Also amazing job, Christian — talking for so many hours with this ease and answering every question. What I appreciated very much was that every question was treated seriously. You motivated people to ask questions! Thank you very much for the great training, but also for the great atmosphere!

Thank you again for the seminar. You could follow along well, and each topic still went quite deep. Injection and XSS in particular reminded me how important those fundamentals are — and how valuable it is to see them explained this clearly.

The training was extremely informative and so much fun! 10/10