Senior Systems Engineer, Browser Isolation

At Cloudflare we are on a mission to help build a better Internet. Today the company runs one of the worlds 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 Magazines Top Company Cultures list and ranked among the Worlds Most Innovative Companies by Fast Company.

At Cloudflare were not looking for people who wait for a polished roadmap; were 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 youre 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 youll fit right in.

Available Locations: Austin TX (US) Lisbon (Portugal) London (UK)

About the team

Cloudflare Browser Isolation runs web content in remote browsers helping protect users from threats while preserving a responsive browsing experience. Our team builds the Chromium-based browsing engine remote rendering and streaming technology and distributed services that manage browser sessions across Cloudflares global network.

You will work at the intersection of systems programming distributed systems and security. Engineers contribute across the product collaborating on browser changes service orchestration observability and build infrastructure.

Scope and growth

At this level you will be accountable for outcomes across a problem area that may span several components. You will establish technical direction make uncertainty and trade-offs explicit and help other engineers succeed while remaining hands-on. This is an individual-contributor role; people-management experience is not required.

Technologies we use

• Browser engine: Chromium and C.
• Systems programming: Rust.
• Distributed services and orchestration: Go TypeScript Cloudflare Workers Nomad and Consul.
• Remote rendering and streaming: WebRTC and Skia.
• Browser client: TypeScript WebAssembly and WebGL.

What you will do

• Lead complex multi-component initiatives from problem definition and design through implementation staged rollout and measurable production outcomes.
• Design and implement changes in our Chromium-based C browser and the distributed services and systems components supporting remote browsing working across Go Rust and TypeScript.
• Make and explain architectural trade-offs across latency availability resource efficiency security boundaries and operational complexity.
• Investigate difficult cross-layer failures and performance bottlenecks distinguishing browser host network and control-plane causes.
• Improve resilience capacity management observability and release safety; define success metrics and validate results.
• Coordinate work with partner teams surface dependencies and risks early and guide delivery through ambiguity.
• Mentor engineers and raise the quality of code reviews design reviews testing documentation and operational practices.
• Participate in the teams production on-call rotation after onboarding lead technical incident investigations as needed and drive durable corrective actions.

This role may require flexibility to be on-call outside of standard working hours to address technical issues as needed.

Desirable Skills Knowledge and Experience

• Strong production C proficiency including memory and resource ownership concurrency and debugging in substantial codebases.
• A track record of independently leading complex systems or distributed-service improvements across multiple components from an unclear problem to a reliable production outcome.
• Strong Linux/UNIX and networking fundamentals with experience diagnosing correctness latency and resource-consumption issues using profiling and operational evidence.
• Experience designing and operating distributed systems with sound judgment about service boundaries data partitioning consistency timeouts and retries backpressure capacity limits and recovery from partial failures.
• Experience designing safe rollout and recovery strategies and maintaining production software over its lifecycle.
• Ability to communicate trade-offs clearly align stakeholders mentor teammates and improve engineering practices through constructive feedback.
• A willingness to work across C Rust Go and TypeScript and learn unfamiliar parts of the stack.

Bonus Points

These are preferred qualifications not prerequisites. Prior Browser Isolation or Cloudflare experience is not required.

• Browser engines Chromium browser sandboxing or security-sensitive systems.
• Low-latency streaming graphics remote computing or other real-time systems.
• Container and workload orchestration including Nomad or Kubernetes and service discovery.
• Experience using Rust for systems programming or distributed services.
• Go or TypeScript; WebRTC Skia WebAssembly or WebGL.
• Production observability capacity planning incident response or build and release infrastructure.

For Portugal based hires: Estimated annual salary is between 66000 - 91000.

The final offer will be inclusive of time exemption in alignment with the applicable law and collective bargaining agreements.

This role is eligible to participate in Cloudflares equity plan.

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

Were not just a highly ambitious large-scale technology company. Were a highly ambitious large-scale technology company with a soul. Fundamental to our mission to help build a better Internet is protecting the free and open Internet.

Project Galileo: Since 2014 weve equipped more than 2400 journalism and civil society organizations in 111 countries with powerful tools to defend themselves against attacks that would otherwise censor their work technology already used by Cloudflares enterprise customers--at no cost.

Athenian Project: In 2017 we created the Athenian Project to ensure that state and local governments have the highest level of protection and reliability for free so that their constituents have access to election information and voter registration. Since the project weve provided services to more than 425 local government election websites in 33 states.

1.1.1.1: We released 1.1.1.1 to help fix the foundation of the Internet by building a faster more secure and privacy-centric public DNS resolver. This is available publicly for everyone to use - it is the first consumer-focused service Cloudflare has ever released. Heres the deal - we dont store client IP addresses never ever. We will continue to abide by our privacy commitment and ensure that no user data is sold to advertisers or used to target consumers.

Sound like something youd like to be a part of Wed love to hear from you!

Please note that applicants who progress to the offer stage of the interview process may be asked to attend an in-person interview within one of the Cloudflare Offices or Cloudflare Hubs. More details about this will be available at that stage of the interview process.

This position may require access to information protected under U.S. export control laws including the U.S. Export Administration Regulations. Please note that any offer of employment may be conditioned on your authorization to receive software or technology controlled under these U.S. export laws without sponsorship for an export license.

Cloudflare is proud to be an equal opportunity employer. We are committed to providing equal employment opportunity for all people and place great value in both diversity and inclusiveness. All qualified applicants will be considered for employment without regard to their or any other persons perceived or actual race color religion sex gender gender identity gender expression sexual orientation national origin ancestry citizenship age physical or mental disability medical condition family care status or any other basis protected by law. We are an AA/Veterans/Disabled Employer.

Cloudflare provides reasonable accommodations to qualified individuals with disabilities. Please tell us if you require a reasonable accommodation to apply for a job. Examples of reasonable accommodations include but are not limited to changing the application process providing documents in an alternate format using a sign language interpreter or using specialized equipment. If you require a reasonable accommodation to apply for a job please contact us via e-mail at or via mail at 101 Townsend St. San Francisco CA 94107.