Hello, world

Update — August 2026: I revised this introduction because my current work is much more focused on compilers, runtimes, and WebAssembly.

Hi, I’m Joshua Tenner.

I build compilers, WebAssembly runtimes, programming languages, testing tools, and other developer tools.

A large part of my work is about WebAssembly, usually called Wasm. I care about the parts that become important when a tool must be correct, fast, and maintainable.

That includes:

• WebAssembly validation and optimization;
• compiler intermediate representations;
• native code generation;
• WebAssembly GC;
• SIMD;
• fuzzing and conformance testing;
• runtime and host interfaces;
• allocation and garbage-collection pressure;
• reproducible builds and release workflows;
• AI-assisted software development.

Several projects on this site work at different layers of the same system.

Dewdrop compiles the Dew programming language to WebAssembly GC. Starshine validates and optimizes WebAssembly modules. Wago compiles and runs WebAssembly as native code. Facet defines a system interface for modern Core WebAssembly. stage_left explores isolated actor-style processes. as-harness provides WebAssembly-based testing infrastructure for AssemblyScript.

I use this blog as an engineering record. Some articles explain a design. Some document a problem and its solution. Others teach a technical idea that I needed to understand clearly myself.

I try to keep the writing simple. Technical subjects already have enough complexity without adding unnecessary prose.

console.log("Hello world!");

If you are interested in compilers, WebAssembly, runtimes, testing, or developer tools, you should find something useful here.

Thanks for reading.

JT