Johannes Scharlach
Co-Founder & CTO at Herzgebraut
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolJohannes Scharlach is a Berlin-based technology leader and founder with 12 years of experience building products, teams and platform-level engineering practices. As Co-Founder & CTO of ROSE Framework and previous co-founder roles (TeamHub, Herzgebraut), he blends hands-on engineering with product-led entrepreneurship—bootstrapping a consumer subscription business while driving technical strategy for startups and scaleups. He led platform engineering at Frontier Car Group / OLX Autos, establishing continuous deployment, inclusive hiring and QA-as-product-expert practices, and has coached engineers and new managers to take ownership in production. A mathematician by training, Johannes contributes to open-source (notably refactoring elasticsearch query builder internals in bodybuilder to enable nested filters and aggregations) and favors pragmatic, test-driven improvements that increase system flexibility and stability.
12 years of coding experience
8 years of employment as a software developer
Mathematik, Mathematik at Durham UniversityBachelor of Science (B.Sc.) Mathematik, Bachelor of Science (B.Sc.) Mathematik at Humboldt-Universität zu Berlin
German, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (11)
elasticsearch10
elasticsearchquery10
javascript10
aws-elasticsearch10
builders10
builder-io10
builder-pattern10
elasticsearch-api10
amazon-elasticsearch10
unit-testing9
nodejs8
Programming languages (4)
Github contributions (5)
danpaz/bodybuilder
Oct 2016 - Sep 2017
An elasticsearch query body builder :muscle:
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:6 reviews, 30 commits, 13 PRs in 11 months
Contributions summary:Johannes's primary contribution involved refactoring the `filterBuilder` and integrating filter aggregation functionality within the `bodybuilder` library. They extracted the `filterBuilder` out of the core `Bodybuilder` class and created separate builders. This enabled the creation of nested filters and the use of aggregations, like the `filterAggregation`, making the library more flexible. The user's work also encompassed writing integration tests, demonstrating a commitment to the overall stability of the project.
elasticsearchquerydslbuilderjavascript
johannes-scharlach/housing
Jan 2015 - Mar 2015
Contributions:21 commits, 13 PRs, 15 pushes in 2 months
strlife
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