Sebastian Kreutzberger
Co-founder & CTO at YGO GmbH
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolSebastian Kreutzberger is a serial founder and engineering leader with 14 years of experience building and scaling product-driven startups across Europe and the US, currently co-founder & CTO of YGO in Berlin. He founded SwiftyBeaver, the first end-to-end encrypted logging platform for Swift, and has a deep hands-on affinity for Golang, SvelteKit and Swift while balancing strategic CTO roles across AI, AR and cloud-native products. His career includes early leadership at Wunderlist and launching enterprise source-code management with RhodeCode, demonstrating fluency in both consumer and developer-focused platforms. An active open-source contributor, he has improved core framework reliability and observability in projects like Vapor and strengthened testing in SwiftyBeaver, showing an eye for debugging and maintainability. Sebastian combines product intuition with low-level engineering discipline and a pattern of turning researchy ideas—AI-personalized travel, multi-cloud PaaS, and encrypted analytics—into production-ready businesses.
14 years of coding experience
20 years of employment as a software developer
Computational Visualistics Economics, Computational Visualistics Economics at Otto-von-Guericke University Magdeburg
German, English
Stackoverflow
9,023reputation
2.4mreached
19answers
8questions
cocoa-touch
top-5%
double
top-1%
objective-c
top-5%
swift
top-1%
ios
top-5%
uitableview
top-5%
Github Skills (19)
unit-testing10
testing10
http10
server-side-swift10
double10
web-framework10
swift10
logging10
ios9
application-framework9
objective-c9
app-framework9
uitableview9
cocoa-touch9
pasteboard6
Programming languages (11)
Github contributions (5)
SwiftyBeaver/SwiftyBeaver
Nov 2015 - Apr 2022
Convenient & secure logging during development & release in Swift 4 & 5
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:1 review, 456 commits, 252 PRs in 6 years 5 months
Contributions summary:Sebastian's commits primarily focus on testing the SwiftyBeaver logging framework. They modified the existing test suite to include testing of formatted dates, quick integration of console and file destinations and their output. They also expanded the tests to include destination integration (adding, removing, and testing different destination types). Further tests for logging messages using different message types and color schemes were also added.
secureswift5swift4secure-logginglogging
vapor/vapor
Sep 2016 - Nov 2016
💧 A server-side Swift HTTP web framework.
Role in this project:Back-end Developer
Back-end DeveloperContributions:9 commits, 3 PRs, 1 branch in 2 months
Contributions summary:Sebastian primarily focused on improving the logging functionality within the Vapor framework. They implemented features to detect the file, function, and line number where log calls originate, enhancing debugging capabilities. Additionally, they removed inconsistent code patterns and addressed a deprecation warning related to TLS certificates. The user's work centered on core framework improvements and maintenance.
http2frameworkswift-nioswiftserver-side
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