Chas Emerick
Managing Director at Auslegungsmaschinenhaus GmbH
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolChas Emerick is a seasoned software engineer and founder with 19 years of experience building developer tools, distributed systems, and commercial software products from Berlin. As co‑founder and long‑time partner at Snowtide, he led development and commercialization of PDFxStream, a production PDF extraction library used in Java and .NET ecosystems. He combines deep expertise in programming language theory and compiler construction with pragmatic backend and DevOps work—contributing to prominent Clojure projects like clojurescript, leiningen, nREPL and friend. Comfortable at the intersection of open source and product, he has repeatedly improved build tooling, REPLs, and cloud provisioning libraries while shipping robust enterprise software. His background in cognitive science and AI informs a methodical, language‑aware approach to engineering complex data extraction and distributed workflows. He is also committed to building more equitable organizations and brings a long track record of mentorship and community contribution in the Clojure ecosystem.
19 years of coding experience
3 years of employment as a software developer
Cognitive Science, Computer Science, Artificial Intelligence, Philosophy of Mind, Cognitive Science, Computer Science, Artificial Intelligence, Philosophy of Mind at Hampshire College
Github Skills (60)
dependency-management10
authorizations10
apidoc10
jclouds10
scripting10
clojure-cli10
testing10
apache-http-client10
user-authentication10
authentication10
leiningen10
httpc10
java10
clojure10
tomcat10
Programming languages (25)
Github contributions (5)
cemerick/friend
Mar 2012 - Mar 2021
An extensible authentication and authorization library for Clojure Ring web applications and services.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:179 commits, 9 PRs, 17 pushes in 9 years 1 month
Contributions summary:Chas primarily worked on the cemerick/friend library, an authentication and authorization library for Clojure Ring web applications. Their commits implemented an HTTP Basic authentication workflow, including handling authentication challenges. They also added interactive form authentication workflow and implemented authorization mechanisms within the library, alongside enhancements for session handling and user role management.
clojure-ringweb-applicationsauthorizationringauthentication
nrepl/nrepl
Sep 2010 - Nov 2017
A Clojure network REPL that provides a server and client, along with some common APIs of use to IDEs and other tools that may need to evaluate Clojure code in remote environments.
Role in this project:Back-end Developer
Back-end DeveloperContributions:275 commits, 23 pushes, 2 tags in 7 years 2 months
Contributions summary:Chas primarily contributed to the core functionality of the nREPL project, focusing on improving error handling and adding documentation to the Clojure code. They refactored helpers and tooling namespaces, along with adding test cases. The user also addressed a performance bottleneck by including a type hint for threadpool and added support for a number of internal project features.
evaluatenreplreplneedclojure
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