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.
What this role actually needs.
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. 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. Requirements: - 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). Company context: Cloudflare is the global edge network, security, and developer platform serving a meaningful share of internet traffic.
Day-to-day expectations
Cloudflare lists these responsibilities for the Principal VM Engineer – Workers Runtime Team role.
- 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 a strong candidate brings
These requirements are extracted from the source listing and normalized for UpJobz readers.
- 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).
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Principal VM Engineer – Workers Runtime Team is framed against UpJobz source checks, country scope, compensation visibility, and work-authorization signals so candidates can make a faster go/no-go decision.
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Current extracted signal: Open to TN, H-1B, and OPT candidates already in the United States. UpJobz treats this as a search signal, not legal advice, and links visa-sensitive roles back to the relevant visa hub where possible.
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- Use open to tn, h-1b, and opt candidates already in the united states as part of your positioning so the recruiter does not have to infer it.
- Lead with distributed collaboration, async delivery, and timezone discipline.
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Source: boards.greenhouse.io · Source ID: 6718312 · Confidence: 93/100 · Last checked: May 7, 2026
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