Software Engineer - Data Security

Confirmed live in the last 24 hours

Cloudflare

Hybrid

Posted March 4, 2026

Job Description

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

What you’ll do

In this role, you’ll help build and maintain Data Security products as a Software Engineer. These products empower customers to gain deep visibility into Cloud/SaaS security opportunities and into trends in their network traffic and product use. As an engineer on the team, you will focus on building new functionality into our APIs and distributed code while ensuring the performance and reliability of our services which ingest millions of data points each day. You’ll be joining a team of bright, knowledge-seeking engineers who are truly missionaries in solving the security and network visibility challenges for our customers.

Technologies we use:

Products are written in Go, Python, and Typescript.
Code runs on Kubernetes, Cloudflare Workers, AWS, GCP, Azure.
We utilize Postgres as our data store, Redis as our cache, and Kafka as our message broker.
Our frontend is written in Typescript and React.
For service monitoring we use Prometheus and Grafana.
For service logging we use Elasticsearch and Kibana.
For product analytics we use Clickhouse and BigQuery.

Examples of desirable skills, knowledge, and experience:

3+ years of professional experience building and managing reliable and performant software systems at scale, preferably with technologies like: Go, Python, Postgres
Passion for making the digital world a more secure place
Excellent debugging and optimization skills
Willingness, curiosity, and enthusiasm to learn new programming languages, technologies and systems
Strong interpersonal and communication skills. Caring and empathy are coveted traits here!

Bonus

Frontend programming experience in Typescript/Javascript
Previous experience working with third-party API integrations
Previous experience working on security products

What Makes Cloudflare Special?

We’re not just a highly ambitious, large-scale technology company. We’re a highly ambitious, large-scale technology company with a soul. Fundamental to our mission to help build a better Internet is protecting the free and open Internet.

Project Galileo: Since 2014, we've equipped more than 2,400 journalism and civil society organizations in 111 countries with powerful tools to defen

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