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!
Skills Required
- 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
- Operational mindset with scalable, production-ready solutions
- Deep understanding of web technologies including HTTP, JavaScript, WASM
Cloudflare Compensation & Benefits Highlights
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Healthcare Strength — Employer-verified medical, dental, and vision coverage, mental-health/EAP support, FSAs/HSAs, disability and life insurance, and pet insurance for U.S. employees are explicitly included. The overall package is presented as comprehensive across core health protections.
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Leave & Time Off Breadth — Unlimited/flexible PTO, paid holidays and sick time, plus three paid volunteer days per year are highlighted. These policies indicate generous time-off flexibility beyond standard accrual models.
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Equity Value & Accessibility — Employees commonly receive equity alongside an Employee Stock Purchase Plan with a discounted purchase feature. Relocation support and home-office stipends further reinforce access to ownership and distributed-work enablers.
Cloudflare Insights
What We Do
Cloudflare, Inc. (NYSE: NET) is the leading connectivity cloud company on a mission to help build a better Internet. It empowers organizations to make their employees, applications and networks faster and more secure everywhere, while reducing complexity and cost. Cloudflare’s connectivity cloud delivers the most full-featured, unified platform of cloud-native products and developer tools, so any organization can gain the control they need to work, develop, and accelerate their business. Powered by one of the world’s largest and most interconnected networks, Cloudflare blocks billions of threats online for its customers every day. It is trusted by millions of organizations – from the largest brands to entrepreneurs and small businesses to nonprofits, humanitarian groups, and governments across the globe.
Why Work With Us
Cloudflare employees come from all walks of life. We are mission-driven, and our team is energized by a collaborative, creative environment that celebrates our differences and fosters new ways to grow together.
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Cloudflare Offices
Hybrid Workspace
Employees engage in a combination of remote and on-site work.
We are committed to developing a global team that is distributed with a flexible working approach. Doing this equitably and inclusively is essential to our success. Visit our careers site for more on 'How & Where We Work.'
