Thomas Karstens
Chief Product & Technology Officer at horizoom GmbH
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolThomas Karstens is a seasoned technology and product leader with 13 years of experience shaping product strategy, architecture, and engineering teams across frontend, backend, data and infrastructure. As CPTO and former CTO/co-CEO at horizoom, he blends hands-on engineering with executive leadership to scale teams, recruit key talent, and drive company growth from Berlin. His background spans full-stack engineering in Ruby/Rails and Vue.js to distributed systems, event-driven architectures and FaaS, and he has practical open-source experience improving tooling like JSHint’s reporting for CI integration. Known for fostering inclusive, distributed teams, he previously led engineering at Cint supporting millions of users and mentored engineers through hiring, coaching and process design. He holds an MSc in Computer Science and brings a rare combination of product intuition, operational rigor, and low-level code craftsmanship.
13 years of coding experience
16 years of employment as a software developer
Bachelor of Science (B.Sc.) Computer Science, Bachelor of Science (B.Sc.) Computer Science at Hochschule FlensburgMaster of Science (M.Sc.) Computer Science, Master of Science (M.Sc.) Computer Science at Technische Universität BerlinPolitical Science / English Studies, Political Science / English Studies at Kiel University
German, English
Github Skills (4)
jshint10
xml10
javascript10
code-formatting8
Programming languages (17)
Github contributions (5)
jshint/jshint
Aug 2014 - Aug 2014
JSHint is a tool that helps to detect errors and potential problems in your JavaScript code
Role in this project:
Back-end Developer
Back-end DeveloperContributions:14 commits in 8 days
Contributions summary:Thomas primarily contributed to the `checkstyle.js` reporter within the JSHint project. Their work focused on modifying the output format for better compatibility with Jenkins, adjusting the severity levels and the XML structure. These changes included correcting how the severity of the reported issues was classified and fixing indentation issues to improve code readability.
problemsjavascriptstatic-code-analysisdetectjshint
opahk/banking_data
Jul 2016 - Jan 2022
Contributions:3 reviews, 14 commits, 6 PRs in 5 years 6 months
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