Principal VM Engineer – Workers Runtime Team

Job Title: Principal VM Engineer – Workers Runtime Team

About Us

At Cloudflare, we are on a mission to help build a better Internet. Today the company runs one of the world’s largest networks that powers millions of websites and other Internet properties for customers ranging from individual bloggers to SMBs to Fortune 500 companies.

Job Description

We are looking for a Principal 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.

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.

What We're Looking For

• 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).

Benefits

• Competitive salary and benefits package.
• Opportunity to work with a highly skilled and experienced team.
• Flexible working hours and remote work options.
• Access to the latest technology and tools.
• Professional development opportunities.

How to Apply

If you are a motivated and experienced engineer looking for a new challenge, please submit your resume and cover letter to [insert contact email]. We look forward to hearing from you!