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Cloudflare

Senior Systems Engineer - Application Security

Cloudflare
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hybrid senior full-time $66,000 - $91,000

First indexed 23 Sept 2026

Description

Job Description

We are looking for a Senior Systems Engineer to join our Application Security team at Cloudflare. As part of this team, you will be responsible for designing systems, writing code, and reviewing technical specifications and code. You will also deploy and maintain live software-based services at scale, support and grow other engineers through knowledge sharing, and keep up to date with trends in detecting current and emerging security risks to web applications.

Responsibilities

  • 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.

Benefits

Cloudflare offers a positive and stimulating place to work, where you can enjoy friendly relationships with your colleagues and the freedom to have real impact on our products and customers. While the work is demanding, the company is unusual in offering an unlimited leave policy. In addition to a competitive base salary, Cloudflare offers an equity program with stock grants on joining and regular refreshers linked to performance. We also offer medical and dental insurance, mental health support, a tax efficient defined contributions pension plan and life insurance.

Compensation

Compensation may be adjusted depending on work location. For Lisbon, the estimated base salary is $66,000 - $91,000.

What Makes Cloudflare Special?

We're not just a highly ambitious, large-scale technology company. We're a highly ambitious, large-scale technology company with a soul. Fundamental to our mission to help build a better Internet is protecting the free and open Internet. We have projects such as Project Galileo, Athenian Project, and 1.1.1.1 to help fix the foundation of the Internet by building a faster, more secure and privacy-centric public DNS resolver.

This listing is enriched and indexed by YubHub. To apply, use the employer's original posting: https://job-boards.greenhouse.io/cloudflare/jobs/8222091