Software Engineer, Bots + Fraud Detection

Sorry, this job was removed at 10:20 p.m. (CST) on Friday, Sep 12, 2025
4 Locations
Hybrid
Cloud • Information Technology • Security • Software • Cybersecurity
Helping Build a Better Internet
The Role
Available Locations: Austin or NYC (NAMER), Lisbon or London (EMEA)
About the department
Cloudflare's Engineering Team is home to some of the industry's top engineers, dedicated to building and scaling innovative software that handles a huge proportion of the Internet. Our team responsible for Bots and Fraud Detection develops cutting-edge solutions to identify and mitigate malicious bot activities, ensuring the security and integrity of online applications. The team collaborates with product and other engineering teams to implement advanced fraud detection mechanisms and employ machine learning techniques to safeguard digital assets from evolving threats in the cybersecurity landscape.
What you'll do
Join Cloudflare's Bot and Fraud Detection team to tackle real-world security challenges, leveraging massive threat intelligence data through data science and machine learning. Design, build, and scale high-performance distributed software for one of Cloudflare's fastest-growing security products. Work with global data exceeding 50 million HTTP requests per second, utilizing a tech stack that includes Go, Python, JavaScript, Rust, Lua, Kafka, Kubernetes, ClickHouse, PostgreSQL, and Jupyter notebook. Make a meaningful impact in detecting and mitigating abusive HTTP L7 layer traffic worldwide.
What are we looking for?
  • Proficiency in designing, integrating, and optimizing distributed data processing pipelines
  • Strong coding skills in Go, Java, Python, or other high-performance languages
  • Experience in constructing and managing alerting and monitoring systems for data processing pipelines
  • Exceptional abilities in systems-level debugging
  • Preferred background or interest in Web Security, HTTP protocols, and JavaScript
  • Familiarity with advanced analytics encompassing machine learning, statistical inference, and AI.
  • Curiosity and empathy
  • Comfortable with tackling ambiguous problems and unblocking yourself

Bonus Points
  • Knowledge and experience with columnar database like Clickhouse.
  • Experience productionalizing ML models
  • Experience with cluster and configuration management systems such as Docker, Salt
  • Strong web security fundamentals
  • Previous experience in bot and fraud detection
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The Company
HQ: San Francisco, CA
4,400 Employees
Year Founded: 2010

What We Do

Cloudflare, Inc. (NYSE: NET) is the leading connectivity cloud company on a mission to help build a better Internet. It empowers organizations to make their employees, applications and networks faster and more secure everywhere, while reducing complexity and cost. Cloudflare’s connectivity cloud delivers the most full-featured, unified platform of cloud-native products and developer tools, so any organization can gain the control they need to work, develop, and accelerate their business.

Powered by one of the world’s largest and most interconnected networks, Cloudflare blocks billions of threats online for its customers every day. It is trusted by millions of organizations – from the largest brands to entrepreneurs and small businesses to nonprofits, humanitarian groups, and governments across the globe.

Why Work With Us

Cloudflare employees come from all walks of life. We are mission-driven, and our team is energized by a collaborative, creative environment that celebrates our differences and fosters new ways to grow together.

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Cloudflare Offices

Hybrid Workspace

Employees engage in a combination of remote and on-site work.

We are committed to developing a global team that is distributed with a flexible working approach. Doing this equitably and inclusively is essential to our success. Visit our careers site for more on 'How & Where We Work.'

Typical time on-site: Flexible
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