Franz Busch
Senior Software Engineer at Zählerfreunde
Munich, Bavaria, Germany
Summary
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Rockstar🎓
Top SchoolFranz Busch is a Senior Software Engineer based in Munich with 11 years of experience building high-performance backend systems, currently working at Apple and co-founding Zählerfreunde. He specializes in Swift on the server, contributing to prominent open-source projects like Swift Async Algorithms, SwiftNIO, grpc-swift and Swift Package Manager—optimizing async algorithms, improving event-loop scheduling, and adding build-time configurability. Franz has a strong track record of making libraries more usable and efficient (e.g., removing Sendable constraints to reduce task overhead and unifying zip implementations) and of improving test automation and documentation readiness for production-grade projects. His background spans enterprise roles at SIXT and freelance consulting, giving him both product-focused and systems-level perspectives. A Wirtschaftsinformatik graduate from TUM, he combines pragmatic engineering with an emphasis on developer experience and scalable async architectures.
11 years of coding experience
9 years of employment as a software developer
Bachelor of Science (B.S.), Wirtschaftsinformatik, Bachelor of Science (B.S.), Wirtschaftsinformatik at Technische Universität München
German, English, French
Stackoverflow
95reputation
3kreached
2answers
5questions
Github Skills (46)
asynchronous10
unit-testing10
algorithms10
json10
package-management10
async10
build-system10
decoding10
event-driven10
encoding10
nio10
eventing10
swift10
json-encode10
json-encoder10
Programming languages (18)
Github contributions (5)
apple/swift-async-algorithms
Aug 2022 - Nov 2022
Async Algorithms for Swift
Role in this project:
Back-end Developer
Back-end DeveloperContributions:130 reviews, 9 commits, 60 PRs in 3 months
Contributions summary:Franz primarily focused on optimizing and refactoring asynchronous algorithms within the Swift Async Algorithms project. They removed `Sendable` constraints from various iterators, including `debounce`, `merge`, `AsyncAdjacentPairsSequence`, `AsyncChain2Sequence`, `AsyncBufferedByteIterator`, and `combineLatest`, improving the library's usability and efficiency by reducing task creation overhead. Furthermore, the user merged the `zip2` and `zip3` implementations into a single one, simplifying the codebase and paving the way for improvements to `combineLatest`.
swiftasync
apple/swift-nio
Jul 2018 - Jan 2023
Event-driven network application framework for high performance protocol servers & clients, non-blocking.
Role in this project:Back-end Developer
Back-end DeveloperContributions:11 releases, 523 reviews, 26 commits in 4 years 7 months
Contributions summary:Franz implemented and improved features related to event loop task scheduling and management within the swift-nio framework. Their contributions include adding mechanisms for repeated task scheduling, allowing tasks to be repeatedly executed with configurable delays and cancellation options. They also enhanced the `NIOAsyncSequenceProducer` and `NIOAsyncWriter` with performance improvements for scheduling and overall performance, as well as adding enhancements like automatic resource cleanup.
swift5event-drivennon-blockingswift-servertcp
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