C

Cloudflare

Secures websites and runs apps on its network

Vulnerability Defense Software Engineer - Cloudforce One

Backend EngineeringConfirmed live in the last 24 hours
Full-time

About the Job

Requirements

  • Working knowledge of cybersecurity concepts, including threat modeling, attack techniques, trust boundaries, exploitability, and defensive controls.
  • Familiarity with incident response workflows, network containment, and remediation.
  • Practical experience in vulnerability research or exploit development and translating findings into actionable mitigations.
  • Experience with artificial intelligence-assisted development and designing agentic artificial intelligence workflows.
  • At least 5 years of experience building large-scale software applications, preferably distributed systems.
  • Experience designing and integrating RESTful application programming interfaces or gRPC services.
  • Knowledge of SQL and common relational database systems such as PostgreSQL.
  • Ability to independently define and deliver solutions in ambiguous problem spaces.
  • Prior experience writing production-ready code in Go or TypeScript.
  • Debugging, optimization, and writing well-tested code expertise.
  • Interest in serving as a technical mentor for teammates.
  • Flexibility to be on-call outside standard working hours as needed.
  • Authorization to receive software or technology controlled under U.S. export laws without sponsorship for an export license may be a condition of employment.

Responsibilities

  • 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 internal and customer-facing services.
  • Analyze, communicate, and help prioritize complex technical concepts across teams.
  • Mentor and guide other developers on the team, building collective technical expertise and promoting best practices for writing well-tested, modular, and reusable code.
  • Work with Go and TypeScript services and technologies such as Rust, Kafka, Redis, Kubernetes, Terraform, PostgreSQL, and Cloudflare’s developer platform.

Desired Qualifications

  • Experience in application security, security research, or security automation.
  • Deep understanding of DNS, TLS/SSL, and HTTP.
  • Experience evaluating probabilistic systems.

About the Company

Cloudflare

Secures websites and runs apps on its network

Cloudflare operates a network that protects websites, delivers online content and runs applications closer to their users. Businesses connect websites and internal systems to its services to filter malicious traffic, control access and improve performance, with security and computing running on shared infrastructure. Developers combine application code, object storage and databases with the network used for content delivery and traffic protection. Cloudflare earns revenue from subscriptions and usage charges, with free plans for basic features and negotiated contracts for larger organizations. Cloudflare was founded in 2009 and is headquartered in San Francisco, California.

Company size
1,001-5,000
Company stage
IPO
Headquarters
San Francisco, CA
Founded
2009

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