Daniel Naber
Angel Investor at The Delta
Potsdam, Brandenburg, Germany
Summary
🤩
RockstarDaniel Naber is a seasoned entrepreneur and investor with 23 years in software and startup building, best known as the founder of LanguageTool (founded 2017, exited 2023) and the long-time maintainer of openthesaurus.de. Based in Potsdam, he blends hands-on backend engineering—demonstrated by German-language improvements to the widely used LanguageTool open-source grammar checker—with strategic angel investments across health, education and climate in the DACH region. Daniel currently leads dotch GmbH and supports a diverse portfolio of early-stage ventures as an active angel and limited partner. His experience spans founding, scaling, product-market fit and successful exit, giving him a pragmatic view of technical debt, language technology and go-to-market execution. Less obvious: he continues to contribute technical fixes to open-source language models, signaling a persistent developer mindset despite executive milestones.
23 years of coding experience
Github Skills (8)
javas10
spellchecking10
spelling10
java10
spell10
code-cleanup9
maintenance9
quality-assurance9
Programming languages (13)
Github contributions (5)
languagetool-org/languagetool
May 2003 - Jan 2023
Style and Grammar Checker for 25+ Languages
Role in this project:
Back-end Developer
Back-end DeveloperContributions:180 reviews, 13802 commits, 1000 PRs in 19 years 11 months
Contributions summary:Daniel's contributions focus on improvements and bug fixes within the German language module. Their work primarily involved addressing grammatical and spelling issues in the existing code base. They addressed issues by adjusting and correcting existing classes, which likely impacted the overall quality of the language model. The changes reflect a focus on enhancing the accuracy and reliability of the language processing within the specified context.
style-checkergrammar-checkercheckergrammarlanguagetool
danielnaber/oxygen-languagetool-plugin
May 2014 - Jan 2023
Contributions:4 releases, 138 commits, 52 pushes in 8 years 9 months
oxygen-xmloxygenxmllanguagetoolxml-editor
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.