Vulnerability Defense Software Engineer (Cloudforce One)

• Cloudforce One is Cloudflare’s threat operations and research team, responsible for identifying and disrupting cyber threats ranging from sophisticated cyber criminal activity to nation-state sponsored advanced persistent threats (APTs)
• Cloudforce One works in close partnership with external organizations and internal Cloudflare teams, continuously developing operational tradecraft and expanding ever-growing sources of threat intelligence to enable expedited threat hunting and remediation
• Members of Cloudforce One are at the helm of leveraging an incredibly vast and varied set of data points that only one of the world’s largest global networks can provide
• The team is able to analyze these unique data points, at massive scale and efficiency, synthesizing findings into actionable threat intelligence to better protect our customers
• As a Software Engineer on this team, you build and evolve systems that help security practitioners assess technical risk, investigate complex systems, prioritize issues, and deliver actionable guidance to engineering teams
• You will be responsible for translating complex security requirements and investigative methods into robust, scalable, and high-performance applications that have a direct impact on making the internet better, safer, and more powerful every day
• While the majority of our services are now written in Go and TypeScript, you will also work with technologies such as Rust, Kafka, Redis, Kubernetes, Terraform, and PostgreSQL
• We also pride ourselves in dogfooding our own products and services so you will be extensively working with Cloudflare’s developer platform as well
• We are looking for great engineers regardless of experience with any of these specific technologies
• Design, build, run, and scale distributed tools and services that translate security tradecraft into scalable, evidence-based systems and workflows
• Partner with security practitioners to understand workflows, bottlenecks, and opportunities for automation
• Improve system design and architecture to ensure stability, performance, and maintainability of both internal and customer-facing services
• Analyze, communicate, and help prioritize complex technical concepts across teams
• Mentor and guide other developers in the team, helping to build collective technical expertise and promote best practices for writing well-tested, modular, and reusable code
• This role may require flexibility to be on-call outside of standard working hours to address technical issues as needed

Benefits

• Competitive pay: We offer a competitive total rewards package, where every employee is an owner of our stock.
• Take-what-you-need vacation: We encourage employees to find a comfortable work-life balance by taking as many days off as they need while still being able to perform their jobs satisfactorily. (We really mean it!)
• Paid maternity & paternity leave: Our global parental leave policy allows up to sixteen paid weeks of bonding leave time for all qualifying new parents.
• Employee benefits: We offer a comprehensive benefits package including healthcare, life insurance, short- and long-term disability, pension plans in accordance with the market practice in our locations.
• Commuter program: We are flexible about where we work and value connecting at the office. Our commuter benefits program is in place to support team members’ commute to work via public transportation without the extra cost burden.
• Wellbeing: Global offerings that provide mental health, childcare and family forming support to our employees across our offices.

• At least 5 years of experience building large-scale software applications, preferably distributed systems
• Experience designing and integrating RESTful APIs and/or gRPC services
• Familiarity with incident response workflows, network containment, and remediation
• Practical experience in vulnerability research/exploit development and translating findings into actionable mitigations
• Interest in opportunities to be a technical mentor for teammates
• Ability to independently define and deliver solutions in ambiguous problem spaces
• Expertise in writing well-tested code
• Working knowledge of cybersecurity concepts such as threat modeling, attack techniques, trust boundaries, exploitability, and defensive controls
• Knowledge of SQL and common relational database systems such as PostgreSQL
• Prior experience writing production-ready code in Go and/or TypeScript
• Experience with AI-assisted development and designing agentic AI workflows
• Excellent debugging and optimization skills
• Application security, security research, or security automation experience
• Experience evaluating probabilistic systems
• Deep understanding of DNS, TLS/SSL and HTTP