Senior Software Engineer (Zero Trust Client)

• We’re looking for a Senior Windows 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 along 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 also have to interact with other languages, such as Swift, C#, C, and python
• As a Senior Software Engineer, you will be expected to make significant contributions to the design and implementation of major development projects, working closely with our product managers and other teams to implement customer-impacting features. 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

Benefits

• Competitive pay: We offer a competitive total rewards package, where every employee is an owner of our stock.
• Take-what-you-need vacation: We encourage employees to find a comfortable work-life balance by taking as many days off as they need while still being able to perform their jobs satisfactorily. (We really mean it!)
• Paid maternity & paternity leave: Our global parental leave policy allows up to sixteen paid weeks of bonding leave time for all qualifying new parents.
• Employee benefits: We offer a comprehensive benefits package including healthcare, life insurance, short- and long-term disability, pension plans in accordance with the market practice in our locations.
• Commuter program: We are flexible about where we work and value connecting at the office. Our commuter benefits program is in place to support team members’ commute to work via public transportation without the extra cost burden.
• Wellbeing: Global offerings that provide mental health, childcare and family forming support to our employees across our offices.

• You will be most successful in this role if you have a good understanding of Windows internals (virtual memory, multi-threading, process lifecycle, kernel programing, system APIs, etc.) and networking protocols (TCP/IP, UDP, DNS, QUIC, H/3, proxying, etc.)
• Very comfortable writing multithreaded, asynchronous code
• Great experience using lower-level languages, such as Rust, C, C++
• Empathetic, proactive, and constructive communication skills, verbal and written
• Experience mentoring engineers and raising a team’s technical bar through code review and knowledge sharing
• Experience in low-level Windows driver development, ideally network drivers
• Strong experience with debugging network-related problems
• Experience owning technical designs end-to-end, writing specs and design docs that coordinate work across engineers and teams
• In-depth knowledge of Windows internals, kernel-mode programming, and network protocols
• An understanding of how VPN technologies work, and the trade-offs between privacy, security, and anonymity
• Excellent programming skills, with experience writing very high-quality and low-complexity code with thorough documentation
• Good understanding of, and experience with, security protocols and standards
• A track record of debugging and resolving complex issues that span team and system boundaries
• Strong experience writing easily-testable and thoroughly-tested code (e.g. using dependency injection with the right abstractions)

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