Senior Software Engineer - Addressing Team

About the Team

Cloudflare operates one of the largest and most interconnected anycast networks on the Internet. To make that happen, a complex orchestra of IP address configuration and distributed systems need to be in harmony to deliver packets from users, through our edge network and then onwards to our customers origin servers or networks.

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.

About the role

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.

Examples of desirable skills, knowledge, and experience

• 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

Bonus Points

• 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)