The Principal Compiler Engineer will enhance the V8 compiler for Cloudflare's Workers Runtime, focusing on performance and scalability improvements in a distributed environment.
Available Locations: Aarhus, Denmark | Austin, TX | Lisbon, Portugal | London, UK | Munich, Germany Principal VM Engineer - Workers Runtime Team About the Department
The Emerging Technologies & Incubation (ETI) team at Cloudflare builds and launches bold, new products that push the boundaries of what's possible on the internet. By leveraging Cloudflare's massive network and edge computing capabilities, we solve complex problems at a scale few others can achieve.
About the Team
The Workers Runtime team is responsible for the execution environment that runs customer code at the edge. We focus on performance, security, and scalability, enhancing JavaScript APIs, WebAssembly support, and system optimizations to prepare for the next 10x scale increase. Our runtime operates in a resource-constrained, highly secure environment, requiring careful management of memory, CPU, and I/O.
What You'll Do
We are looking for a VM Engineer to help improve and embed the V8 virtual machine in our runtime. You'll work on low-level optimizations, performance enhancements, garbage collection, and language support to ensure our platform remains cutting-edge. This role is ideal for engineers who love tackling high-performance, low-latency challenges in distributed environments.
Key Responsibilities
This is an exciting opportunity to work on cutting-edge compiler and runtime technologies at an unmatched scale. If you're passionate about high-performance computing, distributed systems, and compilers, we'd love to hear from you!
The Emerging Technologies & Incubation (ETI) team at Cloudflare builds and launches bold, new products that push the boundaries of what's possible on the internet. By leveraging Cloudflare's massive network and edge computing capabilities, we solve complex problems at a scale few others can achieve.
About the Team
The Workers Runtime team is responsible for the execution environment that runs customer code at the edge. We focus on performance, security, and scalability, enhancing JavaScript APIs, WebAssembly support, and system optimizations to prepare for the next 10x scale increase. Our runtime operates in a resource-constrained, highly secure environment, requiring careful management of memory, CPU, and I/O.
What You'll Do
We are looking for a VM Engineer to help improve and embed the V8 virtual machine in our runtime. You'll work on low-level optimizations, performance enhancements, garbage collection, and language support to ensure our platform remains cutting-edge. This role is ideal for engineers who love tackling high-performance, low-latency challenges in distributed environments.
Key Responsibilities
- Optimize and embed the V8 VM within Cloudflare's Workers Runtime.
- Improve JavaScript execution performance and WebAssembly integration.
- Debug, optimize, and enhance low-latency, real-time environments.
- Ensure the reliability and efficiency of large-scale, Linux-based distributed systems.
- Collaborate with engineers across runtime, security, and networking teams to push the boundaries of edge computing.
- 6+ years of professional experience with C++.
- 4+ years of hands-on VM/compiler experience, ideally with V8.
- Strong knowledge of computer science fundamentals, including data structures, algorithms, and system architecture.
- Experience with low-latency environments (e.g., game streaming, trading systems, high-performance computing).
- Operational mindset - you build scalable, production-ready solutions.
- Deep understanding of web technologies (HTTP, JavaScript, WASM).
- Experience working with Rust in high-performance distributed systems.
- Familiarity with serverless platforms and cloud computing.
- Deep knowledge of JS engine internals (V8, SpiderMonkey, JavaScriptCore).
- Experience with standalone WebAssembly runtimes (Wasmtime, Wasmer, Lucet).
- Strong expertise in Linux/UNIX systems, kernels, and networking.
- Contributions to large open-source projects.
This is an exciting opportunity to work on cutting-edge compiler and runtime technologies at an unmatched scale. If you're passionate about high-performance computing, distributed systems, and compilers, we'd love to hear from you!
Top Skills
C++
JavaScript
Linux
Rust
V8
Webassembly
Cloudflare Los Angeles, California, USA Office
Los Angeles, CA, United States
Similar Jobs at Cloudflare
Cloud • Information Technology • Security • Software • Cybersecurity
As a Senior Solutions Engineer, you'll collaborate with clients on technology solutions, providing expert guidance, managing validation projects, and leveraging diverse skills to solve complex problems. A focus on public sector clients and an understanding of internet technologies is essential.
Top Skills:
BashCdnCloudflareDdosDnsJavaScriptPython
Cloud • Information Technology • Security • Software • Cybersecurity
Drive new business by qualifying accounts for Cloudflare's Enterprise service. Manage sales pipeline, relationships, and negotiations while achieving targets.
Top Skills:
CloudflareComputer NetworksTechnical Concepts
Cloud • Information Technology • Security • Software • Cybersecurity
The Senior Named Account Executive will drive B2B sales, managing accounts and relationships while meeting revenue targets in the Nordics.
Top Skills:
Computer NetworksInternet Infrastructure
What you need to know about the Los Angeles Tech Scene
Los Angeles is a global leader in entertainment, so it’s no surprise that many of the biggest players in streaming, digital media and game development call the city home. But the city boasts plenty of non-entertainment innovation as well, with tech companies spanning verticals like AI, fintech, e-commerce and biotech. With major universities like Caltech, UCLA, USC and the nearby UC Irvine, the city has a steady supply of top-flight tech and engineering talent — not counting the graduates flocking to Los Angeles from across the world to enjoy its beaches, culture and year-round temperate climate.
Key Facts About Los Angeles Tech
- Number of Tech Workers: 375,800; 5.5% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: Snap, Netflix, SpaceX, Disney, Google
- Key Industries: Artificial intelligence, adtech, media, software, game development
- Funding Landscape: $11.6 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Strong Ventures, Fifth Wall, Upfront Ventures, Mucker Capital, Kittyhawk Ventures
- Research Centers and Universities: California Institute of Technology, UCLA, University of Southern California, UC Irvine, Pepperdine, California Institute for Immunology and Immunotherapy, Center for Quantum Science and Engineering
