About

I’m Peter Ullrich, a Senior Elixir developer and bicycle activist living in The Netherlands. I studied Psychology and Computing Science at the University of Groningen, a Top 100 University in The Netherlands.

Since 2024, I work as an Elixir consultant, focusing on small-to-medium companies and project development. Before that, I worked as a senior software engineer for Remote where I built internal payroll software focused on process efficiency and process automation. Before that, I worked for Studitemps where I also built payroll software focused on student temping. I (try to) work according to Domain-driven Design and Test-driven Development principles, write 99% of my code in Elixir, build frontends preferably with Phoenix LiveView, and attempt to apply my Psychology knowledge in the IT context.

My personal projects and side jobs include the video course Build an MVP with Elixir, a time-capsule/mailing service Letter to Yourself, a software solution for efficient decision making DecisionMaker, a YouTube channel focussed on sharing my learnings on software architecture and Elixir development PeterAndCode, diverse projects for the ADFC Köln, a pro-bicycle club, including an overview of all traffic accidents in Cologne Verkehrsunfälle Köln and diverse data crawling scripts like Dauerzählstellen Köln and Parkhausauslastung Köln.

In the past, I hosted the Explain Blockchain podcast, became a ConsenSys certified Solidity Developer, won the Blockchain Hackathon Groningen in 2017 with the team from Forus, came in second in 2018, and wrote my master thesis about Blockchain in Education. I worked in South Africa as a high school teacher, traveled the east coast of Africa on a motorcycle, and spoke at international conferences about topics like Design Patterns in Python and Event Storming in Elixir.