TestCon Europe 2026
October 20-23
Vilnius & Online
Daniel Horn
About
Testing is not just about finding bugs - it’s about much more. Daniel Horn is committed to raising the overall quality of software systems. His motto: “Prevention instead of band-aids and ointments.”
He has worked as a consultant for test automation and infrastructure in various DAX-listed companies for over 12 years. Throughout his professional career, Daniel has focused on enhancing existing test automation solutions and introducing new capabilities into the development process.
In his consulting services, Daniel strives not only to improve testing practices, but also to strengthen the overall quality processes of projects and products.
Daniel Horn | Let’s make a pact – A testers perspective on API-Contracts
APIs have long been the lifeline of modern software products. But how can teams ensure that producers and consumers really speak the same language? Contract testing offers an exciting approach that actively involves testers while at the same time improving collaboration between development teams.
In this talk, Daniel highlights the difference between consumer-driven contracts and producer-driven contracts and explains why this topic is highly relevant for testers. It’s not just about theory: using practical scenarios, he demonstrates how Pact can be used to secure API interactions early, simplify integration tests, and shorten feedback cycles.
In addition to advantages such as higher test stability and less “integration hell,” Daniel also openly addresses challenges — from tooling integration to team communication and organizational pitfalls. The goal is to provide a realistic insight into how contract testing can be successfully introduced and applied as a quality assurance measure.
This talk is aimed at everyone who works with APIs or needs to ensure their quality: testers, developers, QA engineers, product owners, and architects.