David Roetzel - Owner at pbr systems

David Roetzel

Owner at pbr systems

Cologne Bonn Region Germany

Join Prog.AI to see contacts

Summary

🤩

Rockstar

🎓

Top School

David Roetzel is a seasoned software engineer and owner with 17 years of experience building full-stack web applications and services from the Cologne/Bonn region. He combines entrepreneurial leadership at pbr systems with hands-on development, contributing backend improvements to the widely used Mastodon project—particularly around robust link preview handling and data extraction. His work spans classic Rails full-stack features like conference management (frab) through frontend styling to backend indexing and encoding fixes, showing a pragmatic eye for both UX and performance. Trained as a Dipl.-Inform.(FH) in Computer Science, he brings deep practical knowledge of web architecture and data handling. Colleagues describe him as a reliable problem solver who prefers shipping incremental, well-tested improvements over flashy rewrites. He often surfaces subtle bugs (encoding, preview size limits, missing indexes) that quietly improve platform resilience at scale.

17 years of coding experience

Dipl.-Inform.(FH), Computer Science, Dipl.-Inform.(FH), Computer Science at Bonn-Rhein-Sieg University of Applied Sciences

Github Skills (20)

ruby-rails10

back-end-development10

css10

rails10

ruby10

encoding10

html10

nokogiri10

encode10

ruby-on-rails10

postgresql9

bootstrap9

bootstra9

javascript8

ransack7

Programming languages (7)

TypeScriptCSSSCSSJavaScriptHTMLRubyCrystal

Github contributions (5)

frab/frab

Jan 2011 - Aug 2014

conference management system

Role in this project:

Full-stack Developer

Contributions:358 commits, 1 comment in 3 years 7 months

Contributions summary:David contributed to both the frontend and backend of a conference management system. They began by adding a home controller stub and subsequently implemented features for conference management, including creating and editing conferences. The user also integrated a search functionality using the Ransack gem and added a framework to the events model to facilitate states. Additionally, they worked on the styling and appearance of both the frontend and the backend with Bootstrap and other CSS changes.

management-systemspeakerconference-managementedtech

mastodon/mastodon

Apr 2024 - Apr 2025

Your self-hosted, globally interconnected microblogging community

Role in this project:

Back-end Developer

Contributions:3 releases, 463 reviews, 195 PRs in 11 months

Contributions summary:David primarily focused on improving the handling of link previews within the Mastodon application. Their contributions included improving encoding detection for link cards, adding size limits for preview URLs, and addressing encoding errors during preview creation. Further improvements focused on correcting details extraction and handling issues with author names in linked data. Finally, the user made changes to the system check for missing indexes.

social-networkwebfingerpixelfedhosteddocker

Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.

Request Free Trial