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Senior Software Engineer, Security Rules

Cloudflare· Engineering
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Hybrid (London, UK / Lisbon, Portugal)€66k - €91kFull-timePosted 1mo ago

About the role

Senior engineer role on Cloudflare's Security Rules team, focusing on design, implementation, and operation of distributed security-related microservices (e.g., Rate Limiting, Web Application Firewall) at Cloudflare scale. Primarily Rust-based stack with Docker, Go, PostgreSQL, Redis, Memcached, gRPC, Kafka, Clickhouse. Hybrid work location in London or Lisbon.

Responsibilities

  • Design, implement, and maintain the software systems that comprise Cloudflare’s Application Security Product Offering such as Rate Limiting, Web Application Firewall and more
  • Lead technical design and execution for complex projects, helping define architecture, tradeoffs, milestones, and delivery plans
  • Collaborate with internal teams, including security, network engineering, SRE, and product management, to design scalable solutions to difficult technical problems
  • Help raise the technical bar for the team by identifying systemic improvements, reducing operational toil, and influencing long-term engineering direction
  • Review work from your peers throughout all stages of the development lifecycle to ensure high-quality, maintainable code
  • Mentor engineers across the team by sharing technical context, providing thoughtful code and design feedback, and helping others grow in scope and ownership
  • Work with a wide range of technologies and programming languages, including Rust, Go, as well as various databases (SQL and No-SQL), Docker, and Kubernetes

Qualifications

  • 6+ years of relevant professional experience with a technology company
  • Strong programming skills in Rust, Go, C++, or a similar systems-level language
  • Demonstrated ability to lead complex technical projects from ambiguity through delivery
  • Experience building and operating distributed systems
  • Strong interpersonal and communication skills, demonstrating empathy, teamwork and a sense of ownership
  • Experience mentoring engineers, reviewing technical designs and providing high-quality code review
  • Experience with monitoring, alerting and debugging high volume production systems
  • Experience with databases (we use PostgreSQL, Clickhouse and Memcached)

Skills

Required:Programming languagesDistributed systemsCode review / mentorshipMonitoring / debugging / observabilityDatabases

Benefits

  • Health & Welfare Benefits: 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
  • Financial Benefits: Short and Long Term Disability Insurance; Life & Accident Insurance; 401(k) Retirement Savings Plan; Employee Stock Participation Plan
  • Time Off: Flexible paid time off covering vacation and sick leave; Leave programs, including parental, pregnancy health, medical, and bereavement leave
Last updated Sep 9, 2026. Interested? Apply on the company site.

About Cloudflare

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