I build web applications and I'm into web application security. I like to speak about secure development. My mission is to teach web developers how to build secure and fast web applications and why. (more about me, contact)

My trainings

And this is what they say about them: Originally, I've arranged Michal's training primarily for my colleagues because "of course I already know these things"... Michal has changed my mind in the first hour of the first day and continued to do so for the whole two days. Thanks to this training I finally understood some of the attack/defense concepts in full depth, and especially in the right context. — Jan Pospíšil, Senior PHP developer, Czech Radio

Public trainings

Come to my public trainings, everybody's welcome:

Trainings in Prague (or remote) are held regularly in the middle of March, June, September, and December, in other cities irregularly.

In-house trainings

Any public training can also be turned into an in-house training. As an extra, I offer these in-house-only courses:

Looking for Introduction to PHP, Classes and objects in PHP? I've handed them over to Martin Hujer. I've discontinued Web application performance, Martin Michálek runs a similar training.

My articles

Inspecting HTTPS traffic in iOS, on Windows with Fiddler
December 1, 2020

Some time ago, I've change my Google password. That change logged me out of my Google account on my iPad so Photos, Chrome, and other apps were asking again for my password to log me back in. The only problem was that all I could see, was a blank page instead of the Google login form, or just -- (NSURLErrorDomain: -999) error.

(read more…)

Don't let security bugs catch you off guard
November 9, 2020

At the end of August, a critical security bug was discovered and immediately fixed in one of the popular PHP frameworks, Nette. Although the author of the framework, David Grudl, did everything possible, some did not learn about the bug in time and did not update their sites and web apps. Let me tell you a few tips not only for PHP, that will help you to know about similar problems as soon as possible.

(read more…)

My web security training, now available remotely
June 9, 2020

I'm organizing another round of my training, this time remotely. Afternoons, for half of the regular price.

(read more…)

All articles

My talks


Upcoming talks

…at your event or conference, let me know!


Hlava není na Heslo123!
December 3, 2020, ALEF Security Talk – vzdělávání (20 minutes)

Co si nezařídíš, to nemáš
December 1, 2020, TopMonks Caffè: Weby v roce 2020 (30 minutes)

Novinky v browserech z pohledu bezpečnosti
November 11, 2020, JavaDays 2020 (60 minutes)

Hacknul jsem vás, ale v pohodě
November 6, 2020, LAW FIT Kyberbezpečnost (25 minutes)

Co nového v browserech (z pohledu bezpečnosti)
October 3, 2020, LinuxDays 2020 (50 minutes)

All talks

Me answering questions

Bezpečnost na internetu
February 2, 2021, Jak na sítě

Grading How Companies (In)Securely Store Passwords
August 1, 2019, All Things Auth Podcast

Engage in Continual Learning to Advance your IT Career
May 3, 2019, IT Career Energizer

Michal Špaček z Report URI o smyslu práce, potenciálu i prokrastinaci
January 15, 2019, StartupJobs

Blokování webů a stránek
June 4, 2016, Český rozhlas Online Plus

All interviews