Graham Helliwell
Software Engineer at Circlemind (YC F24)
Cambridge, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolGraham Helliwell is a software engineer with 13 years' experience building efficient, production-ready systems from startup MVPs to scaled products. He blends hands-on engineering and architecture—leading teams at Redgate and Savanta while spending significant time writing and pairing on core code, and briefly covering CTO responsibilities during a transition. Currently a founding engineer at Circlemind (YC F24), he’s building a serverless AI agent API that automates browser tasks with a focus on speed and reliability. A long-time open-source maintainer on ICSharpCode projects, he’s contributed substantial Roslyn-based C#/VB.NET conversion and refactoring work, including the well-known CodeConverter. Pragmatic about design, he pushes for iterative improvements and tool choices that raise team efficiency, and in his spare time explores semantic embeddings of text in knowledge graphs.
13 years of coding experience
14 years of employment as a software developer
Maths Further Maths Physics Computing Electronics (AS), Maths Further Maths Physics Computing Electronics (AS) at Priestley CollegeBA Computer Science, BA Computer Science at University of Cambridge
English, 日本語 (japanese), deutsch (german)
Stackoverflow
1,639reputation
507kreached
13answers
0questions
nuget
top-5%
teamcity
top-5%
Github Skills (19)
roslyn10
vbnet10
code-generation10
dotnet-core10
refactoring10
csharp10
vnet10
teamcity9
nuget9
code-analysis9
syntax-checking9
syntax9
testing8
powershell6
netsh6
Programming languages (14)
Github contributions (5)
icsharpcode/CodeConverter
Dec 2017 - Jan 2023
Convert code from C# to VB.NET and vice versa using Roslyn
Role in this project:
Back-end Developer
Back-end DeveloperContributions:38 releases, 90 reviews, 2630 commits in 5 years 2 months
Contributions summary:Graham has primarily contributed to the codebase by converting code from C# to VB.NET and vice versa, using Roslyn. The commits demonstrate work on converting code for various components of the code converter, including the core conversion logic, code generation, and testing. The user interacted with C# and VB.NET code using the Roslyn framework.
roslynvisual-studiodotnetconvert-codecode-converter
icsharpcode/RefactoringEssentials
Nov 2017 - Dec 2017
Refactoring Essentials for Visual Studio
Role in this project:Back-end Developer
Back-end DeveloperContributions:38 commits, 1 PR, 12 comments in 1 month
Contributions summary:Graham primarily contributed to the refactoring and enhancement of the C# code converter within the Refactoring Essentials project. Their work involved implementing new features such as string concatenation assignment conversion, `AddHandler` and `RemoveHandler` implementations, and object collection initializers. They also addressed existing issues by implementing `GetType` as `typeof`, synthesized property backing field accesses, and resolving bracket usage for invocation or indexing.
visual-studio-extensioncsprojrefactoringc-sharpnuget
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