Demystifying Diversity & Inclusion

Current decade in the press is notable for diversity related scandals. Let’s ask ourselves what is Diversity and Inclusion. Why is it important in a professional environment? Is our company ready to accept different ideas? In this talk I will look at the most common misconceptions related to D&I and how lack of diversity shapes our way of working.

Comprehensible Code

The concept of clean code is well known by many developers. But if you ask them what it is, many of them mostly talk about software design. While naming and abstractions are very important in code comprehension, this talk is focuses on fundamentally important comprehension factor—code structure.

The talk covers three main factors that burden reading the code: unoptimized reading experience, visual noise, and obfuscated relations between code parts. The talk emphasizes on feedback loop, which easily breaks if we ignore details in our code. In the end every defect is a missed detail in a software system. Let’s not ignore what they are trying to communicate us!

Understanding Git

Do you want to be effective in how you use Git? So this talk is what every Git user needs to know and understand about the tool. We will briefly look into how git tracks changes internally, how its architecture allows to add number of history related workflows which are based on merging, rebasing, history rewrite and what implications do they bring.

Can You Trust Your Tests (An Introduction to Mutation Testing)

Nobody argues these days that unit tests are useful and provide valuable feedback about your code. But who watches the watchmen? Or, in other words, who is testing tests themselves? Let’s talk about test code quality, code coverage and introduce mutation based testing techniques. Ideas behind mutation testing are nothing new in academic world, but only now become recognized by software developers while programming their production systems. This talk will look into how mutation testing can be used to improve your test-driven development cycle and will try to answer if existing tooling is mature enough to be used while coding your daily tasks.

Understanding Mocks

Mocking plays important role in unit testing, and is a great way to isolate your dependencies that your system under test depends on. Many of us do not question libraries we use, what problems they solve. And some of us have strong opinion on what mocking is, and what it is not. Let’s retrospect on current state of popular mocking frameworks like Mockito and JMock. How are they different from each other and where their weaknesses are. The second part of the talk is an analysis of what it takes to write a mocking framework from scratch in Java 8. This talk is aimed at a curious developer who wants to understand how mocking tools work and hopefully it will hint on things where such tools can be improved. Source code for the example mocking library can be found here:

TDD: Discover Implementation by Stepping Small

Enough with the theory! Let’s look into how classical TDD techniques are applied to discover algorithm implementations by moving forward with baby steps and triangulating into more generic implementation. This talk is fully based on live coding in Scala, but does not require any prior experience with the language. It covers the following techniques: baby steps, transformation priority premise, mutable vs. immutable code, functional programming habits that may get in the way. It will end with introduction to tail call optimization by leaving audience with an open question which code was more readable. I’ve given versions of this talk in Scala, JavaScript, Ruby & Python

Developer Tests - Things to Know

There are many great talks that discuss challenges developers face when writing software tests. In this talk let’s look at test design problems that may seem to be simple but yet fundamentally important and often misunderstood even by experienced programmers.

Java 8 Time API

Overview of Java 8 Time API. Trying to answer why time are API are complex and hard to get right.


Web Security: Authentication

Level: Beginner/Advanced. Workshop covers cookie hashing, secure password storage and many more.

I can run it in JavaScript, Java