Daniel Hahler
Software-Entwickler at Selbstständig
Berlin, Germany
Summary
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Rockstar🎓
Top School
Top expert inNeovim and Vim Ecosystem Development
Daniel Hahler is a seasoned software engineer based in Berlin with 22 years of experience building and maintaining production-grade Python systems, particularly in publishing and web backends. He blends hands-on backend development with DevOps fluency—comfortable in terminals, CI/CD scripting and improving developer workflows—and currently contributes at INFARM while freelancing. Daniel is an active open-source contributor with numerous quality-focused fixes and tests across high-profile projects like Django, pytest, Neovim, Starlette and the Python stdlib, often improving robustness, error handling and test coverage. His work shows a strong attention to tooling and developer experience, from terminal apps and Vim/Neovim plugins to package managers and test runners. Not obvious at first glance: he regularly tackles subtle edge cases (segfaults, plugin version conflicts, tricky parser bugs) that boost long-term maintainability across ecosystems.
22 years of coding experience
12 years of employment as a software developer
Westfälische Wilhelms-Universität MünsterBioinformatik, Bioinformatik at Martin-Luther-Universität Halle-WittenbergAbitur, Englisch, Mathe, Informatik, Sozialwissenschaft, Abitur, Englisch, Mathe, Informatik, Sozialwissenschaft at Söderblom Gymnasium Espelkamp
English, German
Stackoverflow
27,518reputation
9.8mreached
79answers
11questions
authentication
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git
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Github Skills (200)
dependency-management10
difference10
sentry10
restructuredtext10
postgresql10
package-management10
python10
testing10
plugin-development10
vimscript10
command-line-interface10
autocomplete10
bash10
foundation-sites10
coverage10
Programming languages (28)
Github contributions (5)
pdbpp/pdbpp
Sep 2017 - Jul 2022
pdb++, a drop-in replacement for pdb (the Python debugger)
Role in this project:
Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:2 releases, 11 reviews, 557 commits in 4 years 10 months
Contributions summary:Daniel primarily contributed to the `pdbpp/pdbpp` project by fixing bugs within the Python debugger, including resolving issues where the debugger was not properly handling specific states, particularly related to the `curframe` variable. The user also addressed testing issues and edge cases, such as fixing tests for Python 3.7, and handling completion within the debugger. Their commits demonstrate a focus on improving the reliability and functionality of the debugging tool through targeted code changes and improvements to test coverage.
pdbpythondebuggercompletionsyntax-highlighting
neovim/pynvim
Mar 2015 - Jan 2020
Python client and plugin host for Nvim
Role in this project:Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:3 reviews, 40 commits, 43 PRs in 4 years 10 months
Contributions summary:Daniel primarily focused on improving the robustness and maintainability of the `pynvim` project by addressing error handling and implementing various testing improvements. Their contributions include providing exception tracebacks in error responses, fixing test cases, and adding comprehensive tests for features like variable and option manipulation. They also refactored code for better structure and addressed deprecation warnings. This demonstrates a focus on improving the reliability and stability of the library.
nvimpython
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