Daniel Bartholomae
Co-Founder at Fideus
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolDaniel Bartholomae is a Berlin-based founder and technology leader with 11 years of experience building startups, scaling engineering teams, and turning code into operational businesses. As Co-Founder and CTO of Fideus he leads product and engineering to automate tax processes with AI agents, having previously served as CTO and Managing Director at optilyz and founded multiple ventures including MieterEngel and Componently. He blends a strong technical foundation in TypeScript, Go, Python and cloud-native tooling with hands-on QA and test-automation contributions to notable open-source projects like mermaid. A former McKinsey innovation consultant, he combines corporate strategy experience with startup grit, mentoring early-stage founders and advising boards. He writes about the messy transition from technical founder to leader and is open to board, advisory and fractional CTO roles. An often-overlooked strength is his practical focus on organizational practices—introducing ADRs, cross-functional teams and customer-driven development to improve delivery.
11 years of coding experience
12 years of employment as a software developer
Diplom, Mathematics, Diplom, Mathematics at The Julius Maximilians University of Würzburg
Stackoverflow
1reputation
0reached
1answer
0questions
Github Skills (19)
unit-testing10
javascript10
parser10
diagramming10
testing10
typescript10
parsing10
jestjs10
parse10
typescript-types10
typescripts10
test-automation10
diagram9
code-kata9
uml7
Programming languages (13)
Github contributions (5)
swkBerlin/kata-bootstraps
Mar 2019 - Dec 2020
Empty projects for different languages with a failing test
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:8 reviews, 25 commits, 16 PRs in 1 year 8 months
Contributions summary:Daniel's contributions primarily revolve around testing and ensuring the project's functionality. They added and simplified property-based testing examples using TypeScript and the `fast-check` library. Furthermore, the user implemented automated checks to confirm the presence of failing tests, demonstrating a focus on test-driven development and quality assurance. These changes were applied across TypeScript-based test examples, including adding new tests and modifying existing ones to ensure that tests fail as expected.
emptycpppythonrusthaskell
mermaid-js/mermaid
Feb 2022 - Sep 2022
Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:1 review, 26 commits, 4 PRs in 6 months
Contributions summary:Daniel primarily contributed to the repository by adding and modifying tests for the C4 diagram parser. Their work focused on creating tests for various scenarios, including handling whitespace, keywords, and the "default" parameter within the C4 language. They also added tests for features like $tags, $sprite, and $link, as well as tests for Person_Ext and System. This indicates a strong focus on ensuring the parser's correctness and robustness through comprehensive testing.
diagramsflowchartssequencesequence-diagramssimilar
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