Michael Fellinger
Chief Technology Officer at grodaus GmbH
Kufstein, Tyrol, Austria
Summary
🤩
Rockstar🎓
Top SchoolMichael Fellinger is a seasoned technology leader and CTO with 19 years of hands-on experience building backend systems, developer tooling, and deployment infrastructure from his base in Kufstein, Tyrol. He blends executive leadership at grodaus GmbH and prior CTO roles with deep engineering contributions across notable open-source projects like Rack and Rubinius, where he improved core web and language primitives. His work spans full-stack language development (Mint), binary parsing and protobuf-driven tooling for game replay analysis, and robust DevOps for a privacy-focused blockchain node at IOHK. Comfortable switching between writing compiler checks, parsing binary game data in Go, and streamlining Nix/Hydra build pipelines, he brings rare cross-domain fluency. Colleagues rely on him for pragmatic problem solving that moves projects from prototype to production while preserving developer ergonomics. An implicit strength: he frequently operates at the intersection of language/runtime internals and production deployment, making him valuable for teams that need both low-level correctness and scalable operations.
19 years of coding experience
10 years of employment as a software developer
Tiroler Fachberufsschule für Glastechnik
English, German, Japanese
Stackoverflow
1reputation
44reached
0answers
1question
Github Skills (47)
programming-language10
docker10
nix10
hydra10
protocol-buffers10
compiler-development10
testing10
command-line-interface10
http10
virtual-machine10
webpages10
data-parsing10
nomad10
dockers10
web-content10
Programming languages (32)
Github contributions (5)
dotabuff/manta
Jan 2015 - Sep 2015
Dotabuff's Dota 2 Source 2 Replay Parser in Go
Role in this project:
Back-end Developer
Back-end DeveloperContributions:43 commits, 13 PRs, 35 pushes in 7 months
Contributions summary:Michael's commits focused on updating and extending the Dota 2 replay parser. The changes involve refactoring the codebase to use the protobuf libraries and implementing the parsing logic for various demo and network messages. The primary area of development appears to be the handling and processing of game data from replay files, with emphasis on different messages and events in the game, to facilitate further analysis. The commits showcase the user's ability to work with binary data and protobuf definitions to build a functioning replay parser.
golangreplayreplay-parserdota-2dota
rack/rack
Apr 2013 - May 2016
A modular Ruby web server interface.
Role in this project:Back-end Developer
Back-end DeveloperContributions:3 commits, 4 PRs, 2 pushes in 3 years 1 month
Contributions summary:Michael contributed significantly to the Rack project by adding new features to the `Request` and `Response` objects, including methods for IP retrieval, request method identification, and cookie management. They also addressed bug fixes related to the WEBrick handler for Ruby 1.9.1, the FastCGI handler, and the Reloader to ensure it handled various edge cases. Additionally, the user modified the Rack::Mime class and its related tests to correctly handle content encoding and MIME types.
sinatraweb-serverrackrubymodular
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