Thomas Pierrain

Software gardener & eXtreme Programmer obsessed by use cases (Vs. solution-driven approaches), I like using DDD & TDD to boost my efficiency at work.

NewCrafts Paris 2019

EventStorming and Example Mapping From Problem Space to Solution Space

  • Pre-conference-workshop

Creating multiple models for the same problem is one of the more important lessons that Domain Driven Design teaches us. It is a lot cheaper to quickly iterate over them and throw away less useful prototypes before we even start coding. However, creating multiple models can be hard. When we begin gaining insight from our domain, we suffer a lot from cognitive biases that get in our way to gain new insights. We need these insights before we even start thinking about modelling. Tools like event storming and example mapping can help us to deliberate discover, and battle these biases. They help you quickly gain insight into the problem space. But the fallacy here is that we can get locked into the tool, and get stuck again.

What you will learn
In this workshop, you will learn the essentials of event storming and how it can help you gain the necessary insights you need to deliver quality software. With our newly acquired domain knowledge, we can then start exploring the solution space. During the exploration, we begin to design and model multiple models for the same problem with Domain Driven Design patterns. This way of visualising gives us the power to quickly iterate over the different models and figure out which model will be the best to use for now. Eventually, we start our coding journey TDD style, iterating over the model to refactor towards deeper insights while discovering how hexagonal architecture may help us to protect our domain code from the technical concerns, in the long run.

Target Audience
This workshop is for you if you are a software architect or software developer.

Room: Room #2 - Time: 5/15/2019 9:00:00 AM

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NewCrafts 2018

As time goes by... (technical challenges of bi-temporal Event Sourcing)

  • Talk
  • Design
  • Architecture

When building an Event Sourcing system, can we change the past? Can we also forecast “events” in the future?

If we want to provide various projections/visions of things that hapenned over the time, what are the consequences and trade-offs on our code?

All these questions will be answered during this talk. But moreover, I'll tell you our learning story about Bi-temporal Event Sourcing. Yet another illustration of the power of modeling, sketches and concrete examples when we need to understand each others.

Room: Dijkstra - Time: 5/18/2018 3:45:00 PM

Discover Example Mapping: the real essence of BDD

  • Hands-on
  • Practices

Whereas Example Mapping is the less known approach of BDD, it is probably the most powerful technique from that field. No Gherkin here, no automation yet. Pure and simple structured conversations that will foster a crystal-clear vision in every developer’s head.

If you were thinking so far that BDD was equal to 3 amigos meetings or given/when/then, you should come to our workshop in order to discover the real “essence” of BDD.

Room: Engelbart - Time: 5/17/2018 2:45:00 PM


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NewCrafts 2016

Let's reboot DDD!

  • Talk
  • Design
  • Architecture
  • Craftsmanship

Introduced by Eric Evans in 2004 via his Blue Book, Domain Driven Design (DDD) has received tremendous positive feedbacks from many developers & communities over the years. On the other hand, we have to admit that DDD has since not been widely used in the trenches or within most of our development projects... How can we explain such failure in its diffusion? Is DDD in itself difficult or is it just the way people used to present it which makes it hard to grasp and inaccessible? Through our various (more or less successful ;-) experiences, we will try to highlight what DDD is using a simple and more accessible approach. The opportunity for us is to show you how helpful it can be for your day-to-day projects. Wouldn't be the perfect time for all of us to ease the DDD onboarding for beginners and to reboot DDD for experts?

Room: Sagres - Time: 5/12/2016 9:45:00 AM


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Code of conduct

Our conference is dedicated to providing a harassment-free conference experience for everyone, regardless of gender, gender identity and expression, age, sexual orientation, disability, physical appearance, body size, race, or religion (or lack thereof). We do not tolerate harassment of conference participants in any form. Sexual language and imagery is not appropriate for any conference venue, including talks, workshops, parties, Twitter and other online media. Conference participants violating these rules may be sanctioned or expelled from the conference without a refund at the discretion of the conference organisers.