• Quickly build new software features while maintaining high coding standards • Develop new software features from loosely-defined tasks into well-defined requirements and implement them into finished solutions • Maintain and enhance existing codebase • Work independently to drive work packages forward, while collaborating effectively with the existing team • Communicate effectively with team members to ensure smooth project execution

• The role of the Tech Lead is to design a set of best practices for software development using agile methods. Within the development team (Dev Team), Tech Leads are responsible for participating in agile ceremonies, backlog refinement, impact analysis, and designing the product backlog items that will be implemented by Developers. • Actively participates in Discovery sessions, contributing business hypotheses from the perspective of development practices and application construction; • Helps define the technical direction for the product; • Ensures clear communication between architectural definitions and software components; • Ensures the evolution and quality of the Product's development; • Responsible for ensuring compliance with Porto's software development standards, secure development practices, and other development standards and regulations applicable to the technologies used by the Squad; • Propose processes and tools to facilitate the Squad's day-to-day work; • Promote technical processes and rituals among Developers such as estimating, technical definitions, gitflow, and identifying/mappping technical debt.

• Design, build, and maintain full-stack web applications using React and .NET • Develop and optimize SQL Server queries, stored procedures, and data models • Build and consume RESTful APIs and backend services • Contribute to cloud-based deployments and architecture in Azure • Troubleshoot and resolve performance and production issues • Collaborate with product, QA, and business stakeholders • Participate in code reviews and contribute to engineering best practices • Support CI/CD and DevOps processes

Available Locations: Remote in US and Europe 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 - 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). Bonus Points - 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!