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Artwork for WebAssembly Unleashed

WebAssembly Unleashed

F5
Webassembly
Garbage Collection
WASI
Javascript
Formal Verification
Microsoft
Server-Side Programming
Wassette
Rust
Component Model
Shopify
Performance Optimization
Spectec
AI Workloads
AI Agents
Fermion
Bytecode Alliance
Minio
Artificial Intelligence
Whamm

Welcome to WebAssembly Unleashed, your monthly dive into the dynamic world of WebAssembly (Wasm). Join F5’s Joel Moses, Oscar Spencer, and Wasm enthusiast Matthew Yacobucci as they unpack the potential, challenges, and innovations within the Wasm ecosystem. Designed for architects, practitioners, technologists, and Wasm enthusiasts, episodes offer: Insightful discussions on Wasm advancements. Prac... more

PublishesMonthlyEpisodes34Foundeda year ago
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Technology

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Artwork for WebAssembly Unleashed

Latest Episodes

WebAssembly Unleashed is back with a conversation that goes beyond hype and into what’s actually holding Wasm back from broader adoption. Hosts Joel Moses and Oscar Spencer are joined by Ryan Hunt, Senior Software Engineer at Mozilla and lead of the ... more

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WebAssembly keeps expanding beyond its original “run C/Rust in the browser” story, and this episode is a tour through the ideas and tooling that are shaping what comes next. Joel Moses and Oscar Spencer are joined by Conrad Watt, PhD., co-chair of th... more

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WASI Preview 3 is a turning point for WebAssembly outside the browser, and this episode explains why. F5's Joel Moses and Oscar Spencer are joined by Bailey Hayes, CTO of Cosmonic, to break down what “native async” really means for the component mode... more

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GPU acceleration is no longer “just for graphics,” and WebAssembly is stepping into a pivotal moment where portable compute means portable capabilities, not just portable code. In this episode of WebAssembly Unleashed, Joel Moses and Matt Yacobucci s... more

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Debugging is where real engineering happens, and WebAssembly is reaching the point where “you can instrument it” isn’t good enough. In this episode of WebAssembly Unleashed, Joel Moses and Oscar Spencer sit down with Elizabeth Gilbert, a PhD candidat... more

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AI is making code generation feel effortless, but it’s also flooding systems with more untrusted, machine-written logic than most teams are prepared to safely run. In this episode of WebAssembly Unleashed, Joel Moses and Oscar Spencer zoom out on wha... more

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WebAssembly Unleashed goes hands-on with a topic that shows up every time polished architectures collide with real production: programmability. Coming to you from F5's AppWorld 2026, hosts Joel Moses and Oscar Spencer are joined by WorldTech IT's Aus... more

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WebAssembly is usually framed as an application runtime story, but at AppWorld 2026 in Las Vegas, WebAssembly Unleashed shifts the spotlight to a more urgent frontier: data. As AI architectures get hungrier and more distributed, performance and secur... more

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Recent Guests

Ryan Hunt
Senior software engineer at Mozilla and lead of the WebAssembly team in Firefox's SpiderMonkey engine
Mozilla
Episode: Wasm Components in Firefox: Faster Web APIs, Better DX | WebAssembly Unleashed
Conrad Watt
Assistant professor at NTU Singapore; co-chair of the W3C WebAssembly Community Group; researcher in formal semantics of Wasm
Nanyang Technological University
Episode: Wasm research & the future: Threads, SpecTec, and Proofs | WebAssembly Unleashed
Bailey Hayes
CTO of Cosmonic
Cosmonic
Episode: WASI Preview 3: Native async for WebAssembly components | WebAssembly Unleashed
Mendy Berger
Software engineer and open source contributor at Cosmonic, working at the intersection of WebAssembly, graphics and GPU computing
Cosmonic
Episode: WASI WebGPU vs GFX: Portable GPU for Wasm Components | WebAssembly Unleashed
Elizabeth Gilbert
Doctoral candidate at Carnegie Mellon; frequent Open Source contributor; internship colleague
Carnegie Mellon University
Episode: Composable instrumentation in the Component Model | WebAssembly Unleashed
Ben Titzer
Director of WebAssembly Research Institute at Carnegie Mellon University; principal creator of the WebAssembly standard
Carnegie Mellon University / WebAssembly Research Institute
Episode: AI + Wasm: Sandboxing codegen, fixing Wasmtime fast, & new research | WebAssembly Unleashed
Austin Geraci
WorldTech IT engineer
WorldTech IT
Episode: Why Programmability Still Wins: iRules, APIs, and Wasm (WorldTech IT) | WebAssembly Unleashed
Josh Brooks
WorldTech IT engineer
WorldTech IT
Episode: Why Programmability Still Wins: iRules, APIs, and Wasm (WorldTech IT) | WebAssembly Unleashed
Ugur Tigli
CTO of MinIO
MinIO
Episode: Why WebAssembly Belongs in AI Data Infrastructure | WebAssembly Unleashed

Hosts

Joel Moses
Host of WebAssembly Unleashed; affiliated with F5; appears across episodes as a primary moderator and tech strategist.
Oscar Spencer
Co-host; frequently discusses Wasm applications, programmability, and enterprise tech.

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Talking Points

Recent interactions between the hosts and their guests.

Wasm Components in Firefox: Faster Web APIs, Better DX | WebAssembly Unleashed
Q: What were the learnings from putting components in Firefox? Did it work, and was it fast?
Mozilla prototyped component support, identified gaps in the specification, and ran microbenchmarks. Native components were 10% to 20% faster than equivalent JavaScript in most cases, while existing Wasm approaches were 50% to four times slower.
Wasm Components in Firefox: Faster Web APIs, Better DX | WebAssembly Unleashed
Q: Why aren't more people using WebAssembly?
Hunt says feature gaps delayed adoption by some advanced users, while everyday developers face fragmented toolchains, limited library compatibility, and the difficulty of accessing web APIs efficiently from Wasm.
WASI Preview 3: Native async for WebAssembly components | WebAssembly Unleashed
Q: Bailey, what are the most impactful changes from P2 to P3 for developers today?
The changes are largely mechanical, with significant enhancements like maps and named imports/exports in WIT, plus a simpler, bi-directional stream interface. These allow multiple internal implementations of the same API and more declarative configuration, while preserving non-breaking evolution.
From F5 iRules to WebAssembly: Programmability for All | WebAssembly Unleashed
Q: Jason, can you tell us just how impactful is it, you know, customers having access to iRules? Is it something that they use a lot or is it critical to their business?
Jason shares multiple firsthand stories from government and enterprise contexts, illustrating that iRules can be mission-critical by solving highly specific, high-impact traffic problems on the wire, often delivering substantial cost savings and enabling rapid, localized fixes when back-end systems are slow to evolve.
AI + Wasm: Sandboxing codegen, fixing Wasmtime fast, & new research | WebAssembly Unleashed
Q: How are researchers approaching AI-generated code in Wasm sandboxing?
Researchers are exploring WebAssembly as a second level of sandboxing, using instrumentation languages and tooling to safely instrument or interpose on modules, while keeping the original program isolated.

Audience Metrics

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Frequently Asked Questions About WebAssembly Unleashed

What is WebAssembly Unleashed about and what kind of topics does it cover?

WebAssembly Unleashed focuses on the practical and strategic evolution of WebAssembly, often pairing industry practitioners with researchers and ecosystem leaders. Episodes regularly explore topics like concurrency, component models, portable GPU compute, instrumentation and observability, security and sandboxing, AI/ML integration, and enterprise adoption of Wasm across cloud, edge, and data-storage contexts. Notable throughlines include real-world deployment stories, open standards discussions, and the tension between browser-centric and server-side use cases. Guests typically come from major tech companies, academia, or prominent Wasm projects, bringing a mix of architectural insight, hands-on implementation experience, and forward-looki... more

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WebAssembly Unleashed launched a year ago and published 34 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

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What guests have appeared on WebAssembly Unleashed?

Recent guests on WebAssembly Unleashed include:

1. Ryan Hunt
2. Conrad Watt
3. Bailey Hayes
4. Mendy Berger
5. Elizabeth Gilbert
6. Ben Titzer
7. Austin Geraci
8. Josh Brooks

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