Senior Software Engineer, Cloudflare
Addressing Team
Web performance and security platform
Be an early applicant
Web performance and security platform
1001+ employees
Be an early applicant
1001+ employees
Company mission
To help build a better Internet that is bold and ambitious.
Role
Who you are
- You are naturally curious and willing to take a step to learn something you don’t have experience in
- You lead. We are a growing team and you will have a huge role shaping our products, tools and system designs from the ground up
- You have experience writing high-quality code in one or more system programming languages (Go, Python, C/C++)
- You have experience with modern Unix/Linux development and runtime environments
- You have a solid understanding of TCP/IP and basic networking in general
- You have a basic understanding of the HTTP/S/TLS stack
- You have a working knowledge of SQL and relational databases such as PostgreSQL or MySQL
- You have experience building and operating distributed systems
- You have excellent debugging skills and attention to detail when breaking down problems
Desirable
- Experience working with Go
- Experience working with Rust
- Familiarity with UI design, workflows and implementation
- Familiarity with anycast or multi-site unicast networks
- Knowledge of DNS and DNS based traffic management techniques (e.g geo DNS)
What the job involves
- On the Addressing team, you will architect, program, and maintain core software services that enable large corporate networks to be protected by Cloudflare
- Recent projects range from IP conservation efforts, supporting use cases for Policy driven IP address assignment, designing traffic engineering tools that improve the quality of service for billions of users around the world, and building customer APIs to control BGP dynamically
- The Addressing team works closely with our system reliability engineers, network engineers and product engineering teams to build automated systems that span the entire Cloudflare stack
- We are looking for talented Software Engineers to join our small but growing team
- You will work on a range of microservices written mainly in Go
- You’ll be designing and developing new APIs and data models to manage our rapidly expanding addressing needs
- The ever growing suite of Cloudflare products and services means our addressing tools are always evolving
- You will have the opportunity to take on very impactful projects critical for Cloudflare
- You will spend time learning the inner workings of our edge routers, servers, DNS and IP provisioning pipelines
- You will work closely with other engineers to understand their needs and create scalable platforms to be used across the company
- Some of the technologies we use include Go, PostgreSQL, Docker, Kafka, Lua, Clickhouse, SaltStack, Prometheus and the usual Unix/Linux tools and workflows
- We strive to build reliable, fault-tolerant systems that can operate at Cloudflare’s scale
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
- 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.
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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