Jonne Haß
Senior Software Engineer at CONSUST
Berlin, Germany
Summary
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RockstarJonne Haß is a Senior Software Engineer based in Berlin with 15 years of hands-on experience building backend systems, full-stack Rails apps, and DevOps automation. He combines low-level systems work—non-blocking IO and language/runtime contributions to Crystal—with practical service engineering like AWS/VPS infrastructure and API development at sonnen and Offerista. As an active open-source contributor, he’s optimized hotspots in popular projects such as the restforce Salesforce client and implemented ACME protocol features for certificate automation, revealing a pragmatist who cares about both correctness and performance. He has led software, DevOps, and IT teams at Watergenics and now works as a freelance engineer while serving as a Senior Software Engineer at CONSUST. Beyond shipping features, Jonne favors clear, information-rich communication (he asks recruiters to be specific), which reflects his preference for efficiently solving real-world problems.
15 years of coding experience
7 years of employment as a software developer
English, German
Stackoverflow
4,827reputation
51kreached
97answers
0questions
Github Skills (48)
ruby-rails10
acme-protocol10
lib10
system-programming10
crystal-lang10
package-management10
operation10
rails10
travis-ci10
io10
data-structure10
cicd10
standard-library10
ruby10
optmization10
Programming languages (25)
Github contributions (5)
diaspora/diaspora
Sep 2010 - Apr 2022
A privacy-aware, distributed, open source social network.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 releases, 56 reviews, 3636 commits in 11 years 9 months
Contributions summary:Jonne primarily contributed to the back-end logic and database interactions within the Diaspora project. Their work involved modifying code in several files, including those related to comment, like and reshare creation, and also making changes to user authentication and authorization models. Furthermore, the user implemented SQL schema updates and adjusted the code to handle the updated values.
social-networkprivacyrailsp2pprivacy-aware
unixcharles/acme-client
Dec 2015 - Aug 2016
A Ruby client for the letsencrypt's ACME protocol.
Role in this project:Back-end Developer
Back-end DeveloperContributions:6 reviews, 19 commits, 16 PRs in 8 months
Contributions summary:Jonne primarily focused on developing and refining the Ruby client for the ACME protocol. Their work included implementing features like certificate retrieval with chain, CSR generation, and integrating the DNS-01 challenge verification. The user also refactored the code to remove a dependency on `json-jwt`, replacing it with a custom implementation of JWS signing. Furthermore, they improved the testing infrastructure by introducing a keystash for reusing cached keys and updated the DNS-01 record content to comply with the ACME specification.
letsencryptruby-clientrubyacme-protocolacme
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