Senior Software Engineer, Windows Networking

Cloudflare

full-time

Posted on: 9/29/2025

Location Type: Hybrid

Location: Seattle • California, Colorado, Illinois, Maryland, Minnesota, New York, Texas, Washington • 🇺🇸 United States

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💰 $137,000 - $198,000 per year

Senior

DNSPythonRustSwiftTCP/IP

About the role

Join Cloudflare’s Zero Trust team to work on the Zero Trust desktop client (Warp) protecting corporate devices
Predominantly use Rust along with platform-native languages and APIs to implement high-performance networking code across desktop platforms
Improve code quality and build solid, testable, and well-documented foundations
Interact with other languages (Swift, C#, C, Python) and platform-native APIs
Contribute to design and implementation of major development projects and customer-impacting features
Work closely with product managers and other teams to implement features
Address problems related to scale, performance, quality, and security
May require flexibility to be on-call outside standard working hours to address technical issues as needed

In-depth knowledge of Windows internals (virtual memory, multi-threading, process lifecycle, kernel programming, system APIs)
Experience in low-level Windows driver development, ideally network drivers
Knowledge of networking protocols (TCP/IP, UDP, DNS, QUIC, H/3, proxying)
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
Understanding of VPN technologies and trade-offs between privacy, security, and anonymity
Good understanding of, and experience with, security protocols and standards
Ability to interact with other languages such as Swift, C#, C, and python
Empathetic, proactive, and constructive communication skills, verbal and written

Benefits

Cloudflare offers a complete package of benefits and programs to support you and your family.
Eligible to participate in Cloudflare’s equity plan
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
Short and Long Term Disability Insurance
Life & Accident Insurance
401(k) Retirement Savings Plan
Employee Stock Participation Plan
Flexible paid time off covering vacation and sick leave
Leave programs, including parental, pregnancy health, medical, and bereavement leave

Tip: use these terms in your resume and cover letter to boost ATS matches.

RustCC++SwiftC#PythonWindows internalslow-level Windows driver developmentnetworking protocolsmultithreaded programming

communication skillsempatheticproactiveconstructive