Senior Software Engineer, Durable Objects (DO)

Available Locations: Austin, Texas | Lisbon, Portugal | London, UK About the Department Emerging Technologies & Incubation (ETI) is where new and bold products are built and released within Cloudflare. Rather than being constrained by the structures which make Cloudflare a massively successful business, we are able to leverage them to deliver entirely new tools and products to our customers. Cloudflare’s edge and network make it possible to solve problems at massive scale and efficiency which would be impossible for almost any other organization. What you’ll do The Durable Objects (DO) team is responsible for DO, Cloudflare’s distributed coordination API with strong consistent storage. In this role, you will work with a top‑notch engineering team to expand Cloudflare’s capabilities by ensuring continual reliability, maintaining best‑in‑class performance, and implementing new features and functionality. You will own your code from inception to release, delivering solutions at all layers of the software stack to empower Cloudflare customers. On any given day, you might write a design document that outlines how you plan to solve a specific problem, modify how R2 Storage processes requests, or fix a bug in how our user experience renders. You can expect to interact with a variety of languages and technologies including, but not limited to JavaScript, Typescript, Rust, and C++. Examples of desirable skills, knowledge and experience 10+ years experience working with distributed systems or developing on cloud platforms. An operational mindset – we don’t just write code, we also own it in production. Solid understanding of computer science fundamentals including data structures, algorithms, and object‑oriented or functional design. Deep knowledge of at least one systems programming language such as C/C++ or Rust. Experience in designing and architecting large‑scale distributed systems. Experience working with cloud platforms, especially serverless platforms. Experience being in a technical leader or operating in a team lead role. Bonus Points Previous experience working on database internals such as a SQL query planner. Deep understanding of the web and technologies such as web browsers, HTTP, JavaScript and WebAssembly. Experience working in low‑latency real time environments such as game streaming, game engine architecture, high frequency trading, payment systems. Experience debugging, optimizing and identifying failure modes in a large‑scale Linux‑based distributed system. This position may require access to information protected under U.S. export control laws, including the U.S. Export Administration Regulations. Please note that 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. 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 their, or any other person’s, perceived or actual race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, national origin, ancestry, citizenship, age, physical or mental disability, medical condition, family care status, or any other basis protected by law. We are an AA/Veterans/Disabled Employer. Cloudflare provides reasonable accommodations to qualified individuals with disabilities. Please tell us if you require a reasonable accommodation to apply for a job. Examples of reasonable accommodations include, but are not limited to, changing the application process, providing documents in an alternate format, using a sign language interpreter, or using specialized equipment. If you require a reasonable accommodation to apply for a job, please contact us via e-mail at or via mail at 101 Townsend St. San Francisco, CA 94107. #J-18808-Ljbffr