Principal Software Engineer - Billing

About Us At Cloudflare, we are on a mission to help build a better Internet. Today the company runs one of the world’s largest networks that powers millions of websites and other Internet properties for customers ranging from individual bloggers to SMBs to Fortune 500 companies. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code. Internet properties powered by Cloudflare all have web traffic routed through its intelligent global network, which gets smarter with every request. As a result, they see significant improvement in performance and a decrease in spam and other attacks. Cloudflare was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company. At Cloudflare, we’re not looking for people who wait for a polished roadmap; we’re looking for the builders who see the cracks in the Internet that everyone else has simply learned to live with. We value candidates who have the instinct to spot a "normalized" problem and the AI-native curiosity to create a solution using the latest tools. Our culture is built on iteration, leveraging AI to ship faster today to make it better tomorrow, while ensuring that every improvement, no matter how small, is shared across the team to lift everyone up. If you’re the type of person who values curiosity over bureaucracy, and that AI is a partner in solving tough problems to keep the Internet moving forward, you’ll fit right in. Available Locations: Lisbon, Portugal or London, UK About the department Cloudflare’s Billing Engineering Team is at the heart of every product launch, campaign, and initiative that Cloudflare undertakes. We build and maintain critical systems for billing, payments, usage metering, aggregation, invoicing and revenue recognition — powering billions in revenue and serving millions of customers. Currently we're rebuilding our entire billing platform, designing a metering and aggregation layer that scales effortlessly while ensuring financial accuracy. This is high-impact, high-stakes work that touches all Cloudflare’s cutting-edge products like AI, Zero Trust, Edge Compute, Bot Management, DDoS Protection, etc. As a Principal Systems Engineer, you’ll lead a team of talented, collaborative engineers working across Cloudflare’s ecosystem. You’ll navigate multiple high-profile projects, foster a culture of proactive communication and continuous learning, and drive technical excellence. If you thrive on solving hard challenges at the intersection of financial infrastructure and distributed systems, this is your opportunity to make a massive impact while growing with us. What you'll do We are looking for an energetic team-focused engineer who is growth mindset oriented, able to drive their work from inception, requirements definition, technical specification phase, development, testing and go live. You will work on a range of transactional microservices written in Go. You will be involved in helping to maintain our operational excellence by triaging, solving various inbound tickets related to issues across services billing maintains. As you grow within the team you will be given opportunities to own bigger initiatives and lead projects from start to finish solo or as part of a smaller team. Our tech stack is a modern container-based microservice architecture. Technologies we use include Docker, Go (golang), PostgreSQL, Redis, Kafka, Kubernetes, Temporal and the usual Unix/Linux tools and workflows. We strive to build reliable, fault tolerant systems that can operate at Cloudflare’s scale. Desirable skills and knowledge BS+ in Computer Science or equivalent experience 7+ years professional experience as a developer/engineer Knowledge of Golang or desire to learn it Solid understanding of RESTful APIs and service security Working knowledge of SQL and relational databases such as PostgreSQL or MySQL Experi ... (truncated, view full listing at source)