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Salary: EUR 66,000 - 91,000 / annual
Cloudflare is seeking a Senior Systems Engineer to join the Browser Isolation team. Browser Isolation runs web content in remote browsers to protect users from threats while maintaining a responsive browsing experience. The team builds the Chromium-based browsing engine, remote rendering and streaming technology, and distributed services managing browser sessions across Cloudflare's global network.
You will work at the intersection of systems programming, distributed systems, and security. This is an individual-contributor role where you will be accountable for outcomes across problem areas spanning multiple components. You will establish technical direction, make trade-offs explicit, and help other engineers succeed while remaining hands-on.
Key responsibilities include:
- Lead complex, multi-component initiatives from problem definition through implementation, staged rollout, and measurable production outcomes
- Design and implement changes in the Chromium-based C++ browser and distributed services 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 and validate success metrics
- 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 production on-call rotation after onboarding and lead technical incident investigations
The tech stack includes Chromium and C++ for the browser engine, Rust for systems programming, Go/TypeScript/Cloudflare Workers/Nomad/Consul for distributed services, WebRTC and Skia for remote rendering and streaming, and TypeScript/WebAssembly/WebGL for the browser client.
Requirements:
- Strong production C++ proficiency, including memory and resource ownership, concurrency, and debugging in substantial codebases
- Track record of independently leading complex systems or distributed-service improvements across multiple components, from unclear problem to 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
- Willingness to work across C++, Rust, Go, and TypeScript and learn unfamiliar parts of the stack
Bonus qualifications (preferred, 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 (Nomad or Kubernetes) and service discovery
- Rust for systems programming or distributed services
- Go, TypeScript, WebRTC, Skia, WebAssembly, or WebGL
- Production observability, capacity planning, incident response, or build and release infrastructure
