Software Engineer, Cloudflare
DDoS
Web performance and security platform
Job no longer available
Web performance and security platform
1001+ employees
Job no longer available
1001+ employees
Company mission
To help build a better Internet that is bold and ambitious.
Role
Who you are
- Knowledge of core Internet protocols (IP, TCP, UDP, DNS, TLS, HTTP, HTTP/2, HTTP/3, QUIC)
- Knowledge of common types of network and application-layer DDoS attacks
- Knowledge of common web application architectures
- Experience with Rust, C, Go, or other systems languages
- Experience building large-scale distributed systems
- Experience analyzing large time-series datasets, preferably including SQL
- Experience with the Linux network stack, and specifically eBPF
- Experience with Prometheus, Grafana, and Kibana
- Experience with SaltStack and Kubernetes
- A higher-education degree is not required for this role
What the job involves
- The mission of the DDoS engineering team at Cloudflare is to make DDoS attacks a thing of the past
- We create Internet-scale systems that analyze and mitigate the largest DDoS attacks in the world
- Our team is responsible for a large number of different systems. Our tooling and mitigation systems are primarily written in Rust, but we also use Lua, C, and eBPF
- Our analytics systems are primarily written in Go, and they leverage Kafka and ClickHouse
- Your most important responsibility as a member of the DDoS engineering team is to ensure that Cloudflare and our customers remain available in the face of DDoS attacks
- Toward that end, your job will be to help us enhance the automation that detects and blocks attack traffic
- Some examples of potential future project work include building continuous profiling systems to understand customer traffic patterns, monitoring the health of customer origins, building new ways to customize detection and mitigation behavior, and enriching analytics to provide customers with more actionable data
- Build and enhance the software that automates DDoS detection and mitigation
- Analyze data and identify patterns to strengthen our attack detection and mitigation
- Build and enhance the internal tooling that supports our systems
- Monitor telemetry to improve performance and ensure system health
- Communicate your knowledge and expertise of DDoS within the broader organization
- Provide last-line support for SOC and Escalation Engineers, which can require off-hours availability in extraordinary cases
Our take
Cloudflare is a multi-service global network that provides web security and infrastructure, DDoS mitigation services, and a content delivery network. Founded in 2009, Cloudflare has risen to become an industry giant, with over 25 million global internet properties on its network.
Cloudflare has been responsible for a number of admirable initiatives, offering free web protection to human rights groups, journalists, artists, and US election websites. This goes some way to counteracting the flak Cloudflare has received in some circles for the controversial groups and users who use its services. This chequered history, however, has not affected its over 80% market share in the content delivery network field.
This is perhaps in part because it has proven sharp at staying abreast of the rapidly morphing tech and digital space and customer demands. For example, Cloudflare is shifting to 100% renewable energy usage to create a zero-emissions internet, and in 2020 released a feature that would help users navigate data privacy regulations by selecting where their data is stored.
And impressive third-quarter 2025 results show strong momentum, with revenue rising to $562 million from $430 million a year earlier. The company also raised its full-year guidance, underscoring confidence in continued growth. As demand for secure, cloud-based infrastructure keeps growing, Cloudflare's expanding platform and improving efficiency leave it well positioned to capture further gains in a rapidly growing market.
Steph
Company Specialist at Welcome to the Jungle
Insights
16% employee growth in 12 months
Company
Company benefits
- 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.
Company HQ
China Basin, San Francisco, CA
Leadership
Lee Holloway
(Co-Founder & Lead Engineer)Lee began their career as an Engineer at Homewarehouse for a year before working at Unspam Technologies for 4 years. They co-created Project Honey Pot in 2004 and Cloudflare in March 2009, serving as Lead Engineer of both to present.
Michelle Zatlyn
(Co-Founder, President & Co-Chair)Having worked for Investor Economics and I Love Rewards for a combined 4 years, Michelle worked at Toshiba for 3 years as a Product Manager. She then co-founded Cloudflare in 2009 as COO, and has served as President since 2020. She is also a Board Member at Atlassian.
Matthew Prince
(Co-Founder & CEO)Matthew studied for an MBA at Harvard Business School before co-founding Unspam Technologies in December 2001, and Cloudflare in 2009, where he has served as CEO ever since.
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