This interview was recorded for GOTO Unscripted. https://gotopia.tech
Marcin Grzejszczak - Software Engineer at HeroDevs & Java Champion Jakub Pilimon - Software Architect at jPilo & Software Consultant at Bottega IT Minds
ORIGINAL TALK TITLE The Typo That Broke Production — And Accidentally Created Spring Cloud Contract
Check out more here: https://gotopia.tech/articles/435
RESOURCES Marcin https://bsky.app/profile/toomuchcoding.com https://mastodon.social/@toomuchcoding@fosstodon.org https://twitter.com/MGrzejszczak https://github.com/marcingrzejszczak https://www.linkedin.com/in/marcin-grzejszczak-15565119 https://toomuchcoding.com
Jakub https://twitter.com/JakubPilimon https://github.com/pilloPl https://www.linkedin.com/in/jakub-pilimon-449b7984 http://pillopl.github.io
DESCRIPTION In this GOTO Unscripted episode, Jakub Pilimon sits down with Marcin Grzejszczak — Java Champion, Spring Cloud Contract contributor, author, mentor, and founder of a rural housewives' circle (yes, really) — to trace a 15+ year career that went from C++ on the Côte d'Azur to becoming one of the key architects of Spring Cloud Contract and the Micrometer Observation API. Marcin shares how real production pain — a junior dev fixing a typo in an API that silently broke every client — gave birth to what would become Spring Cloud Contract, and how he's never shy about calling out his own embarrassing code (complete with a Javadoc that opens with "I'm sorry").
The conversation pivots sharply into 2025 territory, with Marcin sketching out an AI-powered future for contract testing: instead of manually writing contracts (which developers routinely abandon), capture live production traffic, let AI generate the contracts, and let humans do what they're actually good at — reviewing and approving. Wrapping up with observability, Marcin argues the most underrated pillar isn't logs, metrics, or traces — it's context. Without knowing why something happened (a deployment, a business event), raw telemetry data is just noise. Practical, honest, and occasionally self-deprecating: a thoroughly human conversation in the age of AI.
RECOMMENDED BOOKS Marcin Grzejszczak • Mockito Cookbook • https://amzn.to/4rXOrtf Marcin Grzejszczak • Instant Mockito • https://amzn.to/4lV2ePQ Sam Newman • Building Microservices • https://amzn.to/3dMPbOs Sam Newman • Monolith to Microservices • https://amzn.to/2Nml96E Roy Osherove • The Art of Unit Testing • https://bit.ly/3obiKNB Charity Majors, Liz Fong-Jones & George Miranda • Observability Engineering • https://amzn.to/38scbma
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