Senior Software Engineer, Durable Objects (DO)
Cloudflare · In-Office
About this role
**About Cloudflare** At Cloudflare, we’re on a mission to help build a better Internet. We protect and accelerate Internet applications online—without adding hardware, installing software, or changing a line of code. Our intelligent global network routes web traffic for customers ranging from individual bloggers to SMBs and Fortune 500 companies, improving performance while decreasing spam and other attacks. **About the Role** Cloudflare’s Emerging Technologies & Incubation team builds and launches bold new products on Cloudflare’s edge network. This role is on the **Durable Objects** team, which powers **stateful serverless applications** for Cloudflare customers. You’ll help evolve the runtime and the low-level routing and storage systems that support real-time chat, multiplayer games, AI agents, and other stateful workloads at scale. **Available Location** - Austin, TX **Responsibilities** - Build and improve the Durable Objects runtime. - Design and develop low-level routing and storage systems that power customer applications. - Improve reliability, scalability, performance, and feature depth. - Own code end-to-end from design through production. - Solve complex problems in production distributed systems. - Work across **JavaScript, TypeScript, Rust, and C++**. - Help drive the continued evolution of the system. **Desirable Skills, Knowledge & Experience** - 5+ years of experience writing systems software. - Operational mindset with experience owning code in production. - Strong foundation in data structures, algorithms, and system design. - Deep expertise in at least one systems programming language such as **C/C++ or Rust**. - Experience designing and architecting large-scale distributed systems. - Familiarity with cloud platforms, especially serverless architectures. - Experience as a technical leader or team lead, driving engineering decisions. **Bonus Points** - Experience working on database internals, especially **SQLite**. - Deep understanding of web technologies such as browsers, HTTP, JavaScript, and 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. **What Makes Cloudflare Special** - **Project Galileo**: Since 2014, tools to defend journalism and civil society organizations against attacks. - **Athenian Project**: Protection and reliability for election information and voter registration. - **1.1.1.1**: A faster, more secure, privacy-centric public DNS resolver—without storing client IP addresses. *Please note:* Applicants who progress to the offer stage may be asked to attend an in-person interview at a Cloudflare office or hub. This role may require access to information protected under U.S. export control laws. Cloudflare is an equal opportunity employer and provides reasonable accommodations for qualified individuals with disabilities.
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