Fabian Fett
Software Engineer at Apple
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolFabian Fett is a Berlin-based software engineer with 11 years of experience specializing in Swift on server and high-performance backend systems. Currently at Apple, he combines systems-level improvements with pragmatic testing and automation—evidenced by substantial contributions to flagship open-source projects like swift-corelibs-foundation and swift-nio where he improved JSONSerialization, performance-critical encoding, and test resilience. He has led small teams and end-to-end products—architecting microservices on AWS, iOS apps, and CI/CD pipelines—and has hands-on experience as both an engineering manager and freelancer. Fabian’s work often sits at the intersection of robustness and performance: from validating RFC-compliant HTTP headers to optimizing memory and event-loop usage in async runtimes. Notably, his open-source contributions include fixing multipart S3 uploads and making subtle protocol-level improvements that ease migration and future-proof SDKs.
11 years of coding experience
8 years of employment as a software developer
Abitur, 1.1, Abitur, 1.1 at Kurfürst-Joachim-Friedrich Gymnasium WolmirstedtBachelor’s Degree, Business Information Systems, Bachelor’s Degree, Business Information Systems at Otto-von-Guericke University MagdeburgUniversity of Wisconsin-Stevens Point
German, English
Stackoverflow
719reputation
61kreached
11answers
5questions
Github Skills (40)
asynchronous10
unit-testing10
json-deserialization10
javascript10
non-blocking10
async10
foundation10
testing10
swift-nio10
aws-lambda10
http10
httpc10
network-programming10
networking10
bytebuffer10
Programming languages (13)
Github contributions (5)
swift-server/async-http-client
Jan 2020 - Oct 2022
HTTP client library built on SwiftNIO
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 releases, 368 reviews, 86 commits in 2 years 9 months
Contributions summary:Fabian primarily contributed to the internal workings of an HTTP client library. Their work involved making the `ResponseAccumulator` public, validating header field names to ensure RFC7230 compliance and also improving error handling, such as catching and reporting remote connection closures. The user also fixed typos and improved code quality by adopting best practices.
swiftnioswift5client-libraryhttp-clientswift-nio
swift-server/swift-aws-lambda-runtime
Mar 2020 - Apr 2022
Swift implementation of AWS Lambda Runtime
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 releases, 243 reviews, 71 commits in 2 years 1 month
Contributions summary:Fabian primarily focused on improving the Swift AWS Lambda runtime. Their contributions involved optimizing the code by refactoring EventLoopFuture chains and improving memory management. They also refactored core components, such as the LambdaRuntimeClient and LambdaRunner, to better handle invocations and context, including adding features like deadlines. Furthermore, the user added support for features like S3 and Cloudwatch events and made performance improvements by removing dependencies.
aws-dynamodblambda-functionsserverlessaws-lambdaruntime
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