Software Engineer, Application Performance

Software Engineer, All Levels
(Hybrid)
Hiring Process & Cloudflare's Application Performance Engineering Teams
If you are obsessed with making the Internet faster, safer and more reliable for everyone, but are unsure about which team to apply for, this role will give you the best opportunity to match with a Software Engineering team that is most aligned to your experience, skill, and ambition. We've created a hiring process designed to find top tier candidates passionate about improving web and software application performance and help them find the best team fit for them at Cloudflare. At the end of the hiring process you will have the opportunity to meet with one or more teams to find out if they are the best team match, but if you discover during the interview process that a particular team is the most interesting to you let us know.
About Engineering at Cloudflare
Cloudflare's Engineers build and operate the software that helps power 25+ million Internet properties and millions of businesses around the world. Across our engineering organizations, we have opportunities for high caliber, curious and empathetic technology enthusiasts to take on big challenges and build some of the best skills in the industry. We're looking for talented team members to help build and quickly iterate on high-growth products, scale our expanding network, build tools to improve availability, performance, uptime, and response times, and make systems fault-tolerant and elastic.
Cloudflare's network is a massively distributed system spanning more than 300 cities in over 125 countries, including 35 cities in Mainland China and interconnects with approximately 13,000 networks globally with a mission to make the Internet better, safer, and more powerful every day. As a Software Engineer at Cloudflare, you'll work on the code that runs close to the end user at Internet scale.
Examples of software systems at Cloudflare:

• A TLS/HTTP proxy to make the connection from eyeball to edge as fast and secure as possible
• Content optimization that takes content served from customer sites and makes it more performant
• A reverse-proxy system that caches customer website content according to customer configuration
• Optimization of connections from Cloudflare to our customers' origin servers to reduce their load and increase performance
• Data Science diving deep into HTTP request data, identifying malicious and fraudulent traffic patterns, and building novel solutions for mitigating such attacks.
• One of the biggest data pipelines in the world, operating at well over 250M events per second
• Open source projects including Pingora, Trie-hard and more to come..

Requirements for this role

• First and foremost curiosity and critical thinking
• Experience (and love for) debugging complex distributed systems
• Experience with a continuous integration workflow and using source control (we use git)
• Experience with build and maintain distributed systems
• Understanding of what it takes to build secure systems
• Ability to work in multiple systems level programming languages - bonus points for Go and/or Rust
• Experience with monitoring, alerting and debugging high volume production systems

Examples of desirable skills, knowledge and experience

• Minimum 4 years professional experience as a developer/engineer
• Solid grasp of how TCP/QUIC and HTTP work
• Experience with Linux networking
• Understanding systems at the network protocol level, including the differences between what the specs say, and what actually happens on the Internet
• Strong systems level programming skills
• Experience with databases similar to PostgreSQL and Clickhouse
• Good Unix knowledge, having submitted patches to Operating Systems a huge plus for some roles
• Fluent in analyses of large data sets
• BA/BS or higher in Computer Science/Engineering or equivalent professional experience