Overview
Senior Software Engineer, Durable Objects (DO) at Cloudflare. Join to apply for the Senior Software Engineer, Durable Objects (DO) role at Cloudflare.
About Cloudflare
At Cloudflare, we are on a mission to help build a better Internet. 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 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. Cloudflare was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company.
What You’ll Do
* Build the Durable Objects runtime which enables Cloudflare customers to build real-time chat applications, multiplayer games, and AI agents.
* Improve reliability, scalability, and performance by developing new system capabilities.
* Own your code end-to-end from design to production.
* Solve complex technical challenges with production distributed systems.
* Develop software in JavaScript, TypeScript, Rust, and C++.
What We’re Looking For
* 5+ years of experience writing systems software.
* Operational mindset – we don’t just write code, we own it in production.
* Strong foundation in data structures, algorithms, and system design.
* Deep expertise in at least one systems programming language (e.g., C/C++ or Rust).
* Experience designing and architecting large-scale distributed systems.
* Familiarity with cloud platforms, particularly serverless architectures.
* Experience as a technical leader or team lead, driving engineering decisions.
Bonus Points
* Experience working on database internals (specifically SQLite).
* Deep understanding of web technologies (browsers, HTTP, JavaScript, WebAssembly).
* Background in low-latency, real-time environments (e.g., game streaming, high-frequency trading, payment systems).
* Experience debugging, optimizing, and identifying failure modes in large-scale Linux-based distributed systems.
This is a high-impact role for engineers who thrive in fast-paced, distributed environments and want to shape the future of cloud computing. If that sounds like you, we’d love to hear from you!
Locations
Available Locations: Austin, Texas | Lisbon, Portugal | London, UK
About Cloudflare and Our Mission
Cloudflare’s Emerging Technologies & Incubation (ETI) team builds bold, innovative products by leveraging Cloudflare’s global edge network to solve problems at an unparalleled scale and efficiency.
Safety and Compliance
This position may require access to information protected under U.S. export control laws, including the U.S. Export Administration Regulations. Any offer of employment may be conditioned on your authorization to receive software or technology controlled under these U.S. export laws without sponsorship for an export license.
Equal Opportunity
Cloudflare is proud to be an equal opportunity employer. We are committed to providing equal employment opportunity for all people and place great value in both diversity and inclusiveness. All qualified applicants will be considered for employment without regard to race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, national origin, ancestry, citizenship, age, disability, or any other basis protected by law. We are an AA/Veterans/Disabled Employer.
Cloudflare provides reasonable accommodations to qualified individuals with disabilities. If you require a reasonable accommodation to apply for a job, please contact us via e-mail at hr@cloudflare.com or via mail at 101 Townsend St. San Francisco, CA 94107.
Seniority level
* Mid-Senior level
Employment type
* Full-time
Job function
* Engineering and Information Technology
Industries
* IT Services and IT Consulting, Technology, Information and Internet, and Computer and Network Security
#J-18808-Ljbffr