Hi!

Does Event Sourcing tempt you but don’t know where to start? Is your business losing data? Would you like to improve your observability both business-wise and technical-wise?

I have something for you! I’ll be giving two workshops soon:

• For Polish-speaking audience - six 4-hour sessions starting from the 24th of February, see details: https://event-driven.io/pl/szkolenie-event-sourcing/

• For English-speaking audience - four 4-hour sessions starting from the 4th of April, https://www.avanscoperta.it/en/training/practical-introduction-to-event-sourcing-workshop

Event Sourcing allows us to keep track of all the business facts without losing a single piece of business information.

Tracing and observing our business workflow allows us to gather insights about the present system’s behaviour and answer tomorrow’s questions and challenges.

However, Event Sourcing also brings new questions and challenges to the development teams:

• What’s the right event granularity?

• Should we go for thin or fat events?

• How do we separate shared/public from private/local events?

Event Sourcing also requires a new set of practices and the development of a new type of confidence in the design, construction, and ownership of durable systems.

My hands-on Event Sourcing workshops are designed to build this confidence. I introduce participants gradually to Event Sourcing through hands-on activities.

I will share my practical experience working with Emmett, Marten and EventStoreDB to get you started!

You don’t need to learn from your own mistakes but benefit from mine.

Is it for you?

Have you thought that “it’d be much easier if we know the past data, or why this has happened”?

Are you integrating your systems with events and already see that keeping them longer could help you improve observability, build projections, and integrate efficiently?

Did you start modelling with EventStorming and want to see how to reflect your model in code?

If any of those are true for you, then learning Event Sourcing can boost your system design and be a valuable asset.

If you have already built some web applications in C#, Java or Node.js and would like to take them to the next level, this workshop may be for you.

You should have experience building web applications using C#, Java, or TypeScript, but you will be introduced to all topics related to Event Sourcing from the beginning.

Even if you know Event Sourcing, such a foundation summary should help you get alignment and ensure you didn’t miss anything.

Topics

• Event Sourcing,

• CQRS,

• Vertical Slices,

• Business Workflows (Saga, Process Manager etc.),

• How Event Stores are built,

• Guarantees that Event Sourcing gives,

• Versioning Events.

Agenda

• Introduction to Event Sourcing. Basic terminology (event, stream of events, command), differences from the classical approach,

• Various ways of handling business logic: Aggregates, Command Handlers, functional approach,

• Write model and data consistency guarantees,

• Good and bad practices in modelling events,

• Projections and best practices for building read models.

• Modelling Event Sourcing workflows: Saga, Choreography, Process Manager, handling distributed processes.

• Challenges in Event Sourcing and EDA: delivery guarantees, event processing order, idempotency, etc.

• Event Sourcing on production, evolution, event versioning, etc.

Learning objectives

In the workshop, you will build a simple but real and complete web application using Event Sourcing, and so you will have experienced:

• when and how to use Event Sourcing and CQRS and what benefits it brings,

• how to reflect your business logic in the code using events,

• how to model and implement business workflows with Event Sourcing,

• differences to the classical approach,

• different tools such as Emmett, Marten, and EventStoreDB and the differences between them,

• how to use Event Sourcing on your system,

• challenges related to Event Sourcing and recommended solutions.

How it works

Through hands-on coding exercises, you’ll gradually learn Event Sourcing theory through practice. Exercises should trigger discussions to deepen the understanding of the topics. You’ll also get model solutions. You can either do them on your own or pair them with others.

You’ll also be modelling group business workflows using EventStorming and implementing the outcome.

The workshop is focused on practice and hands-on experience to give you a quick start.

The workshop happens online and in live streaming.

Questions?

If you have any questions or concerns, please let me know, and I'll be happy to clarify them.

Beware that the number of seats is limited, so you better be quick!

If you've decided, sign up here:

• For Polish-speaking audience - https://event-driven.io/pl/szkolenie-event-sourcing/

• For English-speaking audience - https://www.avanscoperta.it/en/training/practical-introduction-to-event-sourcing-workshop

I also run private workshops and consultancy, not only about Event Sourcing but also EDA and other topics I’m covering in this newsletter. Please reach out if you’d like to get more fine-tuned experience for your project needs!

So cheers, and hopefully, see you soon!

Best regards.
Oskar