My GraphQL Offerings

GraphQL is an alternative to well-known HTTP-based APIs such as REST. With the GraphQL language, a client can flexibly determine for itself which data it wants to read (or write) from the server.

Since GraphQL APIs also have a typed schema, GraphQL clients have type safety when using the API. Based on this schema, there is also excellent tool support for developing GraphQL-based clients.

However, there are some challenges when providing GraphQL APIs in the backend. The flexibility of the language brings correspondingly complex requirements for the server, for example with regard to performance and security.

More Information About GraphQL

"My Video Courses on GraphQL at heise Academy"
"Kurz-Vorstellung von Spring for GraphQL" (YouTube Video)
"GraphQL für Java-Anwendungen" (CyberJUG, YouTube Video)
"Gezielte Auswahl - Typsichere GraphQL-APIs mit Java und React", iX 6/2019

Development of GraphQL Applications

If you want to design and implement a GraphQL API, I will support you with API design, work with you to design architectures for your GraphQL API, make technology suggestions, and perform code reviews. I’m also happy to build a prototype, proof-of-concept, or MVP of your application.

Customized In-House Training

I offer training for you and your team around the topic of GraphQL. We can look into what GraphQL is, what the strengths and weaknesses of this technology are, and whether or how using GraphQL makes sense for your use case.

In addition to the theoretical and conceptual basics, I’ll also show you how to design a GraphQL API for your own application and how to develop, optimize, and operate the backend for it – using graphql-java with Spring Boot. If you want to build a frontend with GraphQL, we can look at how you can develop it end-to-end in a type-safe way using React and TypeScript with different client libraries.

Suggestions for Possible Workshops

The exact content and scope can always be discussed and defined individually.

Introduction to GraphQL: What is GraphQL? What are the advantages and disadvantages of using GraphQL? Is GraphQL the right technology for your project? Duration: about half a day to a full day.
Implementing and Operating GraphQL APIs in the Backend (with Spring GraphQL): In this workshop, we’ll look at how to define and implement a GraphQL API in the backend using Java, Spring Boot, and Spring GraphQL. We’ll also cover topics such as error handling, performance optimization strategies, integration of external services, and of course, security aspects. Duration: approx. two days.
GraphQL Clients with React: If you're building React clients that access GraphQL APIs, we can run a workshop on popular GraphQL libraries like the Apollo React Client. You’ll also learn how to build type-safe applications from backend to frontend using TypeScript and other tools. Duration: 1–2 days.

Workshop: GraphQL Applications with Spring Boot

Here’s a possible agenda for a workshop on developing GraphQL APIs with Spring Boot or Spring for GraphQL. Duration: approx. two days

The Basics: graphql-java, concepts and architecture
Describing the API schema
Implementing queries, mutations, and subscriptions with spring-graphql
Using GraphQL interfaces and unions
Providing custom scalar data types
Asynchronous handler functions
Optimizations with DataLoader and BatchLoader
Accessing REST APIs
Using Spring’s reactive APIs
Optimizing database access for GraphQL queries
Security
Validation and error handling
Testing the API

Contact me

kontakt@nilshartmann.net

Buch

React - Grundlagen, fortgeschrittene Techniken und Praxistipps – mit TypeScript und Redux
2., überarbeitete und erweiterte Auflage, dpunkt-Verlag, 2019