Senior Software Engineer, Workers Runtime

<div class="content-intro"><h3>About Us</h3> <p>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. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code. Internet properties powered by Cloudflare all have web traffic routed through its intelligent global network, which gets smarter with every request. As a result, they see significant improvement in performance and a decrease in spam and other attacks. Cloudflare was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company.</p> <p>At Cloudflare, we’re not looking for people who wait for a polished roadmap; we’re looking for the builders who see the cracks in the Internet that everyone else has simply learned to live with. We value candidates who have the instinct to spot a "normalized" problem and the AI-native curiosity to create a solution using the latest tools. Our culture is built on iteration, leveraging AI to ship faster today to make it better tomorrow, while ensuring that every improvement, no matter how small, is shared across the team to lift everyone up. If you’re the type of person who values curiosity over bureaucracy, and that AI is a partner in solving tough problems to keep the Internet moving forward, you’ll fit right in.</p></div><h3><strong>Available Locations: Austin, TX | New York, NY | San Francisco, CA | London, UK</strong></h3> <h3>About the Role</h3> <p>Cloudflare’s Emerging Technologies & Incubation team builds new products at the edge by combining Cloudflare’s network scale with rapid product incubation. This role is on the Workers Runtime team, which ships the runtime that executes customer code at the edge. You’ll improve performance, expand JavaScript and WebAssembly support, and help the runtime scale safely and efficiently.</p> <h3>Responsibilities</h3> <ul> <li>Build features and improvements for the Workers Runtime.</li> <li>Improve runtime performance, reliability, and scale.</li> <li>Expand JavaScript API and WebAssembly support.</li> <li>Help shape features based on what is technically possible.</li> <li>Own code in production and debug issues in a large-scale distributed system.</li> <li>Work in a fast-paced, iterative environment that balances product goals with technical execution.</li> </ul> <h3>Desirable Skills, Knowledge & Experience</h3> <ul> <li>2+ years of recent professional experience with C++ or Rust.</li> <li>Strong computer science fundamentals, including data structures, algorithms, and software design.</li> <li>Operational mindset and experience owning production systems.</li> <li>Deep understanding of the web, including HTTP, JavaScript, and WebAssembly.</li> <li>Experience debugging and optimizing large-scale Linux-based distributed systems.</li> </ul> <h3>Bonus Points</h3> <ul> <li>Experience building high-performance distributed systems in Rust.</li> <li>Experience with cloud or serverless platforms.</li> <li>Familiarity with JS engine internals such as V8, SpiderMonkey, or JavaScriptCore.</li> <li>Experience with standalone WebAssembly runtimes such as Wasmtime, Wasmer, or Lucet.</li> <li>Deep Linux, UNIX, kernel, or networking knowledge.</li> <li>Contributions to large open source projects.</li> </ul> <h3><strong>Compensation</strong></h3> <p>Compensation may be adjusted depending on work location.</p> <ul> <li><span data-sheets-root="1">For Bay Area based hires: Estimated annual salary of $194,000 - $266,000</span></li> <li><span data-sheets-root="1">For New York City, New Jersey, Washington, Washington DC, and California (excluding Bay Area) based hires: Estimated annual salary of $185,000 - $254,000</span></li> </ul> <h3><strong>Equity</strong></h3> <p>This role is eligible to participate in Cloudflare’s equity plan.</p> <h3><strong>Benefits</strong></h3> <p>Cloudflare offers a complete package of benefits and programs to support you and your family.  Our benefits programs can help you pay health care expenses, support caregiving, build capital for the future and make life a little easier and fun!  The below is a description of our benefits for employees in the United States, and benefits may vary for employees based outside the U.S.</p> <h3><strong>Health & Welfare Benefits</strong></h3> <ul> <li>Medical/Rx Insurance</li> <li>Dental Insurance</li> <li>Vision Insurance</li> <li>Flexible Spending Accounts</li> <li>Commuter Spending Accounts</li> <li>Fertility & Family Forming Benefits</li> <li>On-demand mental health support and Employee Assistance Program</li> <li>Global Travel Medical Insurance</li> </ul> <h3><strong>Financial Benefits</strong></h3> <ul> <li>Short and Long Term Disability Insurance</li> <li>Life & Accident Insurance</li> <li>401(k) Retirement Savings Plan</li> <li>Employee Stock Participation Plan</li> </ul> <h4><strong>Time Off</strong></h4> <ul> <li>Flexible paid time off cover