Maciej "MJ" Jedrzejewski – Your AI & Software Consultant in SwitzerlandHomeAbout meMastering Strategic Domain-Driven Design After all the previous steps, we are ready to continue our journey and try to prepare the first draft for splitting the Fitness Studio domain into several subdomains. But there is still a long way to go. First, let’s try to define what a subdomain is. Every business operates in some business domain – we all know that. To keep it efficient, it is usually divided into different a...

Oh boy, here we go again. Every time we build software, we operate in an area called a domain. It is something that describes our business. It can be:E-commerce – this domain can include online shopping, product catalogue, order processing, payments and many other smaller partsTaxes – in this domain we can find areas like income tax, corporate tax, tax compliance or tax policy...

One of the most common problems in software development is the unconscious creation of a treasury of knowledge and decision-maker in the form of one person. This can be a developer, architect, manager, or any other role without whom we cannot move on:PRs are blocked because this guy has to approve itNo one can work in the concrete area because only John knows itNew deployment cannot be released because only Mark can approve itThe decision o...

Recent years have been marked by microservices. Who among you hasn’t heard of them? They were everywhere – at conferences, groups, job listings, coffee talks, and blog posts. At some point it got to the point where if you weren’t working on a system composed of microservices, it was kind of a problem – you felt the world was getting away from you, and your colleagues were in another galaxy. Someone found a silver bullet for the design of IT systems. On the other...

Accurate estimates are a well-known problem in the world of IT. We always try to reach a level where all items that were estimated become equal to actual implementation. I know this is upsetting but there is no option to achieve it. Of course, sometimes you will perfectly fit it. Still, it is usually over – not bad for your business, but customers might spot that this project is a bit expensive – or under – bad for your business – estimated. Based on my experien...

I am a big fan of automating everything possible – do not confuse it with everything, some things should still be done manually. One step that can help with this is the hero of today’s article – continuous deployments. I assume that most of you have already heard about this at one of the conferences, meetups or read in one of the many articles that can be found on the Internet. For those who have not heard, I have prepared a short, theoretical introduction. Suppo...

It has been a long time since microservices were introduced to the world. They had their ups – yeah, let’s use it everywhere – and downs – whaaat, modular monolith only. But that is not what this story will be about.

~ MJWstęp Od jakiegoś czasu, dużą uwagę poświęcam rozwiązaniom NoSQL. Nie jest to łatwy temat, ponieważ wymaga od programisty kompletnego przestawienia się z myślenia relacyjnego na agregacyjne. Do tego dochodzi mnóstwo „kruczków”, typów do wyboru i wreszcie dostawców rozwiązań. Pojawia się w głowie wiele pytań, tj. Jakim cudem moja baza danych może nie posiadać schematów? Tym i innym zagadnieniom przyjrzę się w dzisiejszym wpisie.Co to jest NoSQL? (nie NOSQL!) Przede wszystkim jest to odpowiedź na cor...

~ MJIQueryable W przypadku IQueryable, wszystkie wyniki najpierw odfiltrowujemy po stronie bazy danych, a następnie przekazujemy do aplikacji.IEnumerable W przypadku IEnumerable, wszystkie wyniki z bazy danych najpierw ładujemy do pamięci, a następnie odfiltrowujemy po stronie aplikacji. W przypadku zapytań do bazy danych, dużo lepszym pomysłem będzie stosowanie IQueryable, ponieważ można skorzystać z dobrodziejstw SQL, co znacznie przyspieszy szybkość działania zapytania oraz zmniejszy ruch wewną...

.NET daje sporo możliwości porównywania tekstów. Co będzie szybsze: Contains czy StartsWith ? Jak to zmierzyć i do czegu służy BenchmarkDotNet ?