Backend Development

What would be the internet without cyber security? To secure my application and to give the possibility  to sign-up and log-in, I'm studying this week Spring Security and the fundamentals of cyber security. 
Therefor I developed and implemented this security-architecture. In the future I'll try to follow a security-by-design approach. 

From now on I am working 100% full stack and have built a quiz app. 
This has a Spring Boot backend with Rest:API interface and a React.js frontend. 
In doing so, I tried to consistently follow through with Clean Code and TDD. Also a charming design with styled components may not be missing of course. 
The current status covers only the first two user stories, a verification tool and also a multiplayer with Sockets.io is planned and will be added soon. 

To end up this intensiv backend training, I designed the backend for a existing frontend react todo App. 

To do so, I analyzed the frontend HTTP Requests, created the Backend response and deployed the backend system. 

https://github.com/Haferkorn/rem-21-4-todo-app

What would be the web without API's? Today I collected Data from the public Covid API and created a backend API comparing the French an German CovidCases by Day. 

https://github.com/Haferkorn/API_Request_Covid

After some basics and the design of a student controlling system, I experimented today with dependency injection and added integration tests. 

100% Test coverage in coming

After two weeks of intensiv training in Java Development, I started to design backend systems using the Spring Framework. 

To go into more depth this week, as a Friday project I designed and implemented an online store backend system in Java. 

Polymorphism, abstraction, inheritance - everything that belongs to object orientation was of course included. In addition, exceptions and optional types and user interactions were added. 

Check out the repo and feel free to give me a review. 

https://github.com/Haferkorn/ProductOrderSystem

Part of being a good programmer is theory and understanding how algorithms and data structures work under the hood. Of course, everyone can use them. After a long time of figuring things out, I rebuilt the LinkedList data structure in Java today and got to grips with the other DSs: 

- Maps,
- Trees,
- arrays
- lists
- queue 
- deque