Senior Software Engineer, Zero Trust Client

Cloudflare•San Francisco, CA

1d•Onsite

About The Position

We’re looking for a Software Engineer to join our Zero Trust team. You will be working on the Zero Trust desktop client, which protects corporate devices by securely and privately sending traffic from those devices to Cloudflare’s global network, which can apply advanced web filtering and advanced Zero Trust policies. In your role, you will predominantly be using Rust alongside platform-native languages & APIs to implement high-performance networking code that runs on multiple desktop platforms. You’ll be expected to improve the code quality and to build solid, testable, and well-documented foundations. You will be most successful in this role if you have a good understanding of operating system concepts (virtual memory, multi-threading, process lifecycle, etc.) and networking concepts & protocols (VPNs, firewalls, TCP/IP, UDP, DNS, QUIC, H/3, proxying, etc.). You will also have to interact with other languages, such as Dart, Typescript, and Python. As a Senior Software Engineer, you will be expected to lead the design and implementation of major development projects, working closely with our product managers and other teams to deliver customer-impacting features. You will mentor other engineers, raise the bar on testability and documentation, and represent the team in cross-org technical discussions. You will use AI-powered tools and systems as part of your daily workflow to analyze and extend our codebase, introspect production behavior, and accelerate problem-solving. You will work on stimulating problems born out of the scale of our deployment, and the stringent quality, performance, and security requirements of our product.

Requirements

Demonstrated history of shipping and supporting client software on real end-user devices — including installer and auto-update flows, crash and telemetry reporting, and debugging issues against the long tail of real-world OS and hardware configurations
Excellent programming skills, with experience writing very high-quality and low-complexity code with thorough documentation.
Strong experience writing easily-testable and thoroughly-tested code (e.g. using dependency injection with the right abstractions)
Great experience using lower-level languages, such as Rust, C, C++
Very comfortable writing multithreaded, asynchronous code
Strong experience with debugging network-related problems
An understanding of how VPN technologies work, and the trade-offs between privacy, security, and anonymity
Good understanding of, and experience with, security protocols and standards
Willingness to adopt and integrate AI tools and systems into your engineering workflow
Empathetic, proactive, and constructive communication skills, verbal and written
Good understanding of operating system concepts (virtual memory, multi-threading, process lifecycle, etc.)
Good understanding of networking concepts & protocols (VPNs, firewalls, TCP/IP, UDP, DNS, QUIC, H/3, proxying, etc.)

Nice To Haves

Experience interacting with other languages, such as Dart, Typescript, and Python.

Responsibilities

Lead the design and implementation of major development projects.
Work closely with product managers and other teams to deliver customer-impacting features.
Mentor other engineers.
Raise the bar on testability and documentation.
Represent the team in cross-org technical discussions.
Use AI-powered tools and systems as part of your daily workflow to analyze and extend our codebase, introspect production behavior, and accelerate problem-solving.
Work on stimulating problems born out of the scale of our deployment, and the stringent quality, performance, and security requirements of our product.