Software Engineer - Network Services

Position Title:

Software Engineer - Network Services

Available Locations:
Austin, Lisbon, London. The role is hybrid, requiring 2 days per week in the office.

At Cloudflare, we are on a mission to help build a better Internet. Today the company runs one of the world’s 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 Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company.

We realize people do not fit into neat boxes. We are looking for curious and empathetic individuals who are committed to developing themselves and learning new skills, and we are ready to help you do that. We cannot complete our mission without building a diverse and inclusive team. We hire the best people based on an evaluation of their potential and support them throughout their time e join us!

Cloudflare Engineers build and operate the software that helps power 25+ million Internet properties and millions of businesses worldwide. Across our engineering organizations, we have opportunities for high‑caliber, curious and empathetic people to take on big challenges and build some of the best skills in the industry.

Welcome to an environment where you will build high‑growth products, help scale our expanding network, build tools to improve availability, performance, uptime, and response times, and make systems failure‑resistant and ready‑to‑scale.

As a Software Engineer at Cloudflare, you’ll work on code that runs close to the end user, at massive scale, and is deployed to 330+ cities worldwide.

• A TLS/HTTP proxy to make the connection from eyeball to edge as fast and secure as possible
• Filtering malicious traffic and handling good traffic according to customer configuration
• Content optimization that makes content served from customer sites more performant
• A platform that runs serverless Workers and provides a key‑value store
• A reverse‑proxy system that caches customer website content according to configuration
• Optimization of connections from Cloudflare to our customers’ origin servers to reduce load and increase performance
• Our Authoritative DNS server and our public resolver 1.1.1.1
• Data Science diving deep into HTTP request data, identifying malicious and fraudulent traffic patterns, and building novel solutions for mitigating such attacks
• Full Machine Learning platform and model development, from feature engineering to model deployment to monitoring
• One of the biggest data pipelines in the world, operating at well over 250M events per second
• We operate some of the fastest and most widely distributed services on the Internet. Your work will focus on building robust, secure, and high‑performance distributed systems with a massive impact.

While not listed as a specific requirement, most roles need the flexibility to be on‑call outside of standard working hours to address technical issues as needed.

• First and foremost curiosity and critical thinking
• Experience (and love for) debugging to ensure the system works in all cases
• Experience with a continuous integration workflow and using source control (we use Git)
• Designing and building APIs
• Understanding of what it takes to build secure systems
• Confidence to work in multiple programming languages – bonus points for Go and/or Rust

• Understanding systems at the network protocol level, including differences between specifications and real‑world behavior
• Strong systems‑level programming skills
• Optimization of complex solutions
• Experience with databases (Postgre
  
  SQL and…