Willi Schönborn
Expert Software Engineer at GROPYUS
Falkensee, Brandenburg, Germany
Summary
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Rockstar🎓
Top SchoolWilli Schönborn is an expert software engineer with 14 years of experience building and improving Java-based backend systems, currently driving technical work at GROPYUS. Previously a Principal Engineer at Zalando, he has deep expertise in API design, HTTP logging, and problem-handling libraries, and has contributed meaningful improvements to well-known open-source projects like JavaPoet and Zalando's problem libraries. He combines hands-on implementation—adding features like configurable indentation, JSON HTTP logging, and robust problem deserialization—with pragmatic refactoring to improve maintainability and test coverage. Willi holds a Master's in Media Informatics and brings a blend of rigorous academic grounding and practical engineering leadership, often focusing on clean APIs and developer ergonomics. He signals aspirations toward distinguished-engineer–level impact, evidenced by thoughtful contributions across widely used Java tooling and libraries.
14 years of coding experience
12 years of employment as a software developer
Master’s Degree, Media Informatics, 1.41 - very good, Master’s Degree, Media Informatics, 1.41 - very good at Beuth University of Applied Sciences Berlin (formerly Technische Fachhochschule Berlin)
English, German, French, Spanish
Stackoverflow
5,060reputation
1.3mreached
86answers
11questions
hibernate
top-5%
guava
top-5%
abstract-class
top-5%
generics
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java
top-5%
reflection
top-5%
Github Skills (28)
json10
spring10
testing10
http10
java10
javas10
code-generation10
exception-handling10
spring-boot10
error-handling10
logging10
guava9
reflection9
unit-testing9
hibernate9
Programming languages (23)
Github contributions (5)
zalando/problem
Jul 2015 - Jan 2022
A Java library that implements application/problem+json
Role in this project:
Backend Developer
Backend DeveloperContributions:18 releases, 399 commits, 341 PRs in 6 years 6 months
Contributions summary:Willi appears to be involved in the initial setup and development of a Java library related to application/problem+json. Their contributions include setting up the initial project structure, defining the core API with interfaces and classes, and implementing features like custom properties and stack trace processing. The user also implemented support for deserializing registered and unregistered exceptional problems and added tests to verify and cover different problem scenarios.
rfc7807java-librarymicroservicesproblemerror
zalando/problem-spring-web
Sep 2015 - Nov 2021
A library for handling Problems in Spring Web MVC
Role in this project:Backend Developer
Backend DeveloperContributions:41 releases, 698 commits, 628 PRs in 6 years 3 months
Contributions summary:Willi restructured parts of the codebase, refactoring and reorganizing code within the `org.zalando.problem.springweb.advice` package and its associated test classes. They updated methods in `Responses.java`, and modified tests in `ResponsesTest.java` and `ProblemTraitIT.java`. The changes involved refactoring the `AdviceTrait` hierarchy and tests to improve maintainability and consistency. These updates demonstrate a focus on improving the core problem handling functionality and its testing.
spring-bootrfc7807problemsspring-mvcspring
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