Benjamin Bartels
Software Engineer at G-Research
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolBenjamin Bartels is a software engineer based in London with nine years of experience building high-performance backend systems and tooling. Currently at G-Research, he brings production-grade skills in .NET and low-level runtime optimizations informed by his open-source contributions to the high-profile dotnet/runtime repository. His work there includes performance wins such as vectorizing String.Split paths, enhancing SpanSplitEnumerator, and adding fast paths in BinaryWriter.Write(string), reflecting a focus on efficient memory and CPU usage. Benjamin holds a First-class BSc from the University of Essex and an MSc with Distinction from the University of St Andrews, and spent time in Google's Cloud Technical Residency sharpening cloud-native and systems expertise. He is a .NET Foundation member and combines rigorous academic training with practical, measurable optimizations that matter in latency-sensitive environments. Outside core work, his contributions show an eye for both correctness (fixing Dispose bugs) and cross-cutting primitives (BinaryPrimitives across CoreLib).
9 years of coding experience
Bachelor of Science - BS, Computer Science, 1st, Bachelor of Science - BS, Computer Science, 1st at University of EssexComputer Science Msc, Distinction, Computer Science Msc, Distinction at University of St Andrews
English, German
Github Skills (14)
text-manipulation10
net10
asp-net10
dotnet-new10
dotnet10
strings10
csharp10
dotnet-core10
performance-optimization9
algorithms8
data-structures8
algorithm8
data-structure8
unit-testing7
Programming languages (7)
Github contributions (5)
dotnet/runtime
Apr 2017 - Jan 2022
.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:45 reviews, 12 commits, 9 PRs in 4 years 9 months
Contributions summary:Benjamin made several contributions to the .NET runtime repository, including fixing a missing `Dispose` call in the `System.Linq` tests. They implemented and refined the `SpanSplitEnumerator`, enhancing the library's ability to split `ReadOnlySpan<char>` with various separators. Furthermore, the user made performance improvements by vectorizing common `String.Split()` paths and adding a fast path to `BinaryWriter.Write(string)`. They also applied `BinaryPrimitives` throughout CoreLib.
dotnetruntimelinuxcsharpxamarin
bbartels/roslyn
Jun 2019 - Jul 2023
The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.
Contributions:5 pushes, 2 branches in 4 years 1 month
roslyndotnetcompilervisual-basiccsharp
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