Engineering Manager - Workers Runtime, Edge Team

Cloudflare•San Francisco, CA

43d•Hybrid

About The Position

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. We realize people do not fit into neat boxes. We are looking for curious and empathetic individuals who are committed to developing themselves and learning new skills, and we are ready to help you do that. We cannot complete our mission without building a diverse and inclusive team. We hire the best people based on an evaluation of their potential and support them throughout their time at Cloudflare. Come join us! Available Locations: Austin | Lisbon | London (Hybrid) About the Department Emerging Technologies & Incubation (ETI) is where new and bold products are built and released within Cloudflare. Rather than being constrained by the structures which make Cloudflare a massively successful business, we are able to leverage them to deliver entirely new tools and products to our customers. Cloudflare’s edge and network make it possible to solve problems at massive scale and efficiency which would be impossible for almost any other organization. About the Team The Workers Runtime team delivers features and improvements to our Runtime which actually executes customer code at the edge. We care deeply about increasing performance, improving JS API surface area and compiled language support through WebAssembly, and optimizing to meet the next 10x increase in scale. The Runtime is a hostile environment - System resources such as memory, cpu, I/O, etc need to be managed extremely carefully and security must be foundational in everything we do. Our work is deeply systems-oriented. We build and maintain the C++ and Rust codebase that embeds the JavaScript engine, manages isolate lifecycles, enforces resource limits (CPU, memory, I/O), and orchestrates how customer scripts are loaded, cached, and executed. We operate in a hostile multi-tenant environment where security must be foundational — from side-channel attack mitigations to isolate sandboxing — and performance is measured in microseconds. What you'll do We are looking for an Engineering Manager to lead the Workers Runtime - Edge team. You will own the team that keeps our runtime service running in production across Cloudflare's entire fleet and drives the architectural evolution of the platform.

Requirements

You bring a track record of leading teams that operate large-scale, low-latency distributed systems.
You understand how to balance the urgency of production with the patience required for foundational improvement.
You are technically credible enough to evaluate architectural proposals, weigh tradeoffs in C++/Rust systems, and earn the respect of a deeply technical team — while being a strong enough manager to build a healthy, high-performing engineering culture.
Experience leading a team
Comfortable leading and hiring a team that builds low level distributed systems.
Excel at planning, creating teams and overseeing execution to meet commitments and deliver with predictability
Comfortable building developer-loved APIs that scale
Demonstrate a track record of leading a team including hiring, on-boarding, and professional development.
You inspire your team to reach higher.
You’re as good as explaining “why” as you are “how”
Experience implementing tools, process, internal instrumentation, methodologies and resolving blockages
At least 4 years of recent professional experience with C++ or Rust.
Solid understanding of computer science fundamentals including data structures, algorithms, and object-oriented or functional design.
Deep understanding of the web and technologies such as web browsers, HTTP, JavaScript and WebAssembly
Strong understanding of Linux systems programming, process models, and networking.

Nice To Haves

Experience building high performance distributed systems.
Experience working with cloud platforms, especially server-less platforms.
Experience with the internals of JS engines such as V8, SpiderMonkey, or JavaScriptCore
Experience with standalone WebAssembly runtimes such as Wasmtime, Wasmer, Lucet, etc
Deep Linux/UNIX systems, kernel, or networking knowledge
Contributions to large open source projects
Experience working in low-latency real time environments such as game streaming, game engine architecture, high frequency trading, payment systems.
Experience debugging, optimizing and identifying failure modes in a large-scale Linux-based distributed system.

Responsibilities

Lead a team of senior systems engineers working in C++ and Rust on one of the most performance-critical and security-sensitive services at Cloudflare.
Drive major infrastructure initiatives — migrating legacy systems, redesigning core abstractions, and laying the groundwork for next-generation runtime architecture that will define the platform for years to come.
Own reliability and release safety for a service handling tens of millions of requests per second. You will improve release processes, invest in health monitoring and automated rollback, and ensure the team can ship changes confidently at scale.
Make hard prioritisation calls between new feature work that unblocks customers and the ongoing investment in foundations, security, and developer velocity that the team needs to stay healthy long-term.
Partner closely with adjacent teams across the Developer Platform to ensure the runtime supports the broader product roadmap — including compute, storage, networking, and observability teams.
Grow and develop the team Hire strong systems engineers, set clear expectations, provide technical mentorship, and create an environment where people do their best work.

Benefits

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.
Health & Welfare Benefits
Medical/Rx Insurance
Dental Insurance
Vision Insurance
Flexible Spending Accounts
Commuter Spending Accounts
Fertility & Family Forming Benefits
On-demand mental health support and Employee Assistance Program
Global Travel Medical Insurance
Financial Benefits
Short and Long Term Disability Insurance
Life & Accident Insurance
401(k) Retirement Savings Plan
Employee Stock Participation Plan
Time Off
Flexible paid time off covering vacation and sick leave
Leave programs, including parental, pregnancy health, medical, and bereavement leave