John Donnellan
Software Engineer
England, United Kingdom
Summary
👤
Senior🎓
Top SchoolJohn Donnellan is a seasoned software engineer with 11 years focused on building resilient, high-performance C# services and a long career at AT&T spanning technical support to labs engineering. He pairs solid systems engineering with a polyglot curiosity—regularly exploring F#, C and Scheme—to solve tricky correctness and performance challenges. His background includes operations and network roles, giving him a practical appreciation for operational reliability and maintainability in production systems. An Oxford mathematics graduate, he brings analytical rigor to algorithmic and design problems. Colleagues value his steady, learning-oriented approach and his ability to translate legacy telecom experience into modern service architectures. Outside typical engineering work he maintains a broad technical palette, often applying ideas from functional and low-level languages to improve robustness.
11 years of coding experience
21 years of employment as a software developer
Bachelor's degree, Mathematics, Bachelor's degree, Mathematics at University of Oxford
Stackoverflow
7,443reputation
812kreached
73answers
4questions
Github Skills (72)
dotnet10
csharp10
get-started9
octave9
asp-net-core9
fsharp9
asp-net9
unit-testing9
xunit9
dotnet-core9
linux8
javascript8
roslyn-analyzer8
scheme-interpreter8
ruby8
Programming languages (11)
Github contributions (5)
codybartfast/aoc19
Nov 2019 - Nov 2020
Contributions:160 commits, 89 pushes, 11 branches in 11 months
codybartfast/sicp-ex5.51
Jul 2020 - Oct 2020
Perhaps, Eventually, a SICP Scheme Interpreter
Contributions:1 release, 366 commits, 2 PRs in 2 months
schemesicpcompilerscheme-interpreterprogramming-language
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