William Tetlow
Staff Software Engineer at Functionize
Glasgow, Scotland, United Kingdom
Summary
👤
Senior🎓
Top SchoolWilliam Tetlow is a Staff Software Engineer in Glasgow with a decade of experience building full‑stack products and leading engineering teams in startup settings. He specializes in TypeScript/JavaScript front- and back-end development (React, Node.js) and has a strong interest in tooling for developers, including compilers and build systems. At Shogun he drove architecturally significant projects—like LLM‑backed content generation and a complete Shopify page import overhaul—and now continues that work at Functionize. He is also an active contributor to the Rust-based SWC compiler, improving parser/codegen and minifier behavior for real-world JavaScript features. Equally comfortable mentoring distributed teams and shipping greenfield systems, he brings practical product sensibility to complex engineering problems.
10 years of coding experience
9 years of employment as a software developer
Bachelor’s Degree Computer Science, Bachelor’s Degree Computer Science at University of Strathclyde
Github Skills (16)
minification10
parserator10
compiler-design10
parser10
rust10
code-generation10
swc10
typescript-types10
ecmascript9
typescript-compiler-api9
typescript9
typescripts9
compiler-optimization9
typescript-compiler9
babeljs8
Programming languages (8)
Github contributions (5)
swc-project/swc
Feb 2022 - May 2022
Rust-based platform for the Web
Role in this project:
Compiler Engineer
Compiler EngineerContributions:16 reviews, 13 commits, 13 PRs in 2 months
Contributions summary:William's contributions primarily involve bug fixes and enhancements related to the SWC (Speedy Web Compiler) project, which is a Rust-based compiler for web technologies. Their work centers on the core aspects of the compiler, including the parser, code generator, and minifier. The commits directly address issues in the handling of specific JavaScript features, like decorators, arrow functions, and Unicode escaping, aiming to improve the accuracy and compatibility of the compilation process. Additionally, the user has worked on feature additions, such as implementing reserved name mangling options within the minifier.
babelrustjavascripttypescript-parsercompiler
williamtetlow/visualfsharp
Feb 2018 - Jan 2019
The Visual F# compiler and tools
Contributions:6 PRs, 49 pushes, 5 branches in 11 months
compilerfsharpcsharp
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