I’m Marcin Grzejszczak, Java Champion and software engineer with 15+ years of experience, including over a decade in open source. I was a long-time maintainer and contributor to Spring Cloud, Spring Boot, and Micrometer, shaping how observability, tracing and cloud-native systems are built at scale. 

Profile

I’ve worked as a Staff / Principal Engineer at companies like Pivotal, VMware, Broadcom and now HeroDevs, and I’ve spoken at 150+ events across 16 countries. I also train and mentor engineers and teams on distributed systems, testing, platform engineering and developer experience.

I share this knowledge because I’ve seen - first-hand - how good platforms unlock teams, and how bad ones silently block business growth.

My goal is to help engineers and infra teams move from “keeping things running” to becoming trusted partners in delivering real business value.