Tyler Mcmullen
Fellow at Fastly
San Francisco, California, United States
Summary
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RockstarTyler Mcmullen is a seasoned software engineer and technology leader with 18 years of experience, currently serving as a Fellow at Fastly after a long tenure as CTO. He combines executive leadership with deep systems-level expertise, particularly in compiler and runtime engineering, evident from substantial contributions to Bytecode Alliance projects like wasmtime, cranelift, and lucet. His open-source work focuses on low-level code generation, x86 instruction encodings, register allocation, and optimization strategies—skills that translate into performance and security improvements for production runtimes. Based in San Francisco, he has a track record of shipping complex infrastructure and sandboxing technologies and bringing compiler internals into real-world delivery. A less obvious strength is his ability to move between strategic company leadership and hands-on, instruction-level engineering, making him equally comfortable in boardrooms and backend codebases.
18 years of coding experience
16 years of employment as a software developer
Github Skills (25)
assembly10
x8610
code-generation10
compiler-design10
assemble10
encoding10
assembler10
compiler-optimization10
encode10
blazor-webassembly10
webassembly10
rust10
cran10
system-programming9
allocation9
Programming languages (9)
Github contributions (5)
bytecodealliance/lucet
Feb 2019 - May 2020
Lucet, the Sandboxing WebAssembly Compiler.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 review, 85 commits, 7 PRs in 1 year 3 months
Contributions summary:Tyler contributed to the Lucet project by implementing optimization level flags and integrating them into the compiler and build process. They modified core compiler files to incorporate an `OptLevel` enum and utilize it within the `isa` function and `Compiler` struct, enabling different optimization strategies. Furthermore, the user updated test suites, the C runtime, and spectest to utilize the new `opt_level` settings. They also made several adjustments related to the borrow checker and memory management, including a new Uffd Strategy.
sandboxingrustwasmerwebassemblycompiler
bytecodealliance/cranelift
Nov 2017 - Apr 2019
Cranelift code generator
Role in this project:Back-end Developer
Back-end DeveloperContributions:61 commits, 13 PRs, 96 comments in 1 year 5 months
Contributions summary:Tyler contributed significantly to the Cranelift code generator, focusing on low-level system code and compiler infrastructure. They implemented features such as stack pointer adjustment, x86 instruction encodings, and the addition of new instructions like `x86_push` and `x86_pop`, and the `adjust_sp_imm` and `copy_special` instructions, along with their encodings. Their work also involved refactoring the code for prologue/epilogue generation and adjusting the code for both 32 and 64 bit architectures.
craneliftpythoncode-generator
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