Systems Engineer, Application Services / Threat Detection

Available locations: Lisbon or London
About The Team
We are a group of around 140 Engineers responsible for Cloudflare's fast-growing security product portfolio (currently WAF, Page Shield, Bot detection, API Shield and DDoS protection). Being part of Cloudflare means working at internet scale and we are uniquely positioned to tackle challenging problems related to being connected to more networks, websites and customers than any other provider worldwide. Working at great scale by default (to an extent not offered by most other employers in big tech) means pushing boundaries well beyond what commodity solutions like Nginx and Kafka provide out of the box. You'll be working with custom components that have been created in an engineering-driven and pragmatic way - our code is well-tested and documented and uses modern ecosystems like Go and Rust. This gives you confidence that you will spend your time having an impact and not firefighting!
Application Services is the single biggest contributor to Cloudflare's annual revenue and has ambitious goals for growth. This means you'd be joining a high-profile part of the business that can really accelerate and support your career. Cloudflare has a strong track record of growing in a thoughtful way and hires carefully so we're confident that you will enjoy working with your colleagues here!
About You
You're a high-performing Engineer in cyber security with at least 3 years of professional experience working hands-on as a software developer. You have experience working with threat detection.
Cloudflare's culture is busy and multifaceted, and people who succeed here are persistent, have a can-do attitude and a genuine willingness to assume good faith in others. This last quality in particular requires them to be empathetic and emotionally intelligent, so you're someone willing to take responsibility for the culture and environment that you create around you.
What You'll Do

• Design systems and write code following bleeding edge industry best practices and help others on the team do the same. Review RFCs, technical specifications and code.
• Deploy and maintain live software-based services at scale (up to 100m requests / second, 1m customers). Take regular shifts as part of the team's On Call rota.
• Support and grow other Engineers through knowledge sharing.
• Keep up to date with trends in detecting current and emerging security risks to web applications and provide input on how these impact Cloudflare's products.
• Work with Engineers and Product Managers outside your immediate team in communicating our roadmap and getting things done.

Required Skills and Experience

• Skilled hands-on writing lean and effective code according to modern best practices. The specific languages and tech stack you're used to aren't important as long as you're open to learning Go, Rust and Clickhouse, plus devops tooling like Kubernetes, Salt, Kafka and Systemd. Strong Linux / Unix fundamentals will be very helpful.
• Experience of cyber security and in particular detecting emerging threats (e.g. OWASP Top Ten).
• Experience with threat detection based on Machine Learning is a bonus.

This role may require flexibility to be on-call outside of standard working hours to address technical issues as needed.