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# Senior Software Engineer, Durable Objects (DO)

- **Company:** CloudFlare
- **Location:** New York, NY, United States
- **Experience:** Expert
- **Salary:** $194,000.0 - $266,000.0
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Artificial Intelligence, C++ (Programming Language), Cloud Computing, Databases, Data Structures, Software Debugging, Linux, Distributed Systems, Payment Systems, High-Frequency Trading, Hypertext Transfer Protocols (HTTP), Web Browsers, Software Engineering, SQLite, System Programming, TypeScript, Rust (Programming Language), Agentic-AI, Low Latency, Cloudflare, Web Technologies, Serverless Computing
- **Published:** October 23, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=cfe6d39a5fb66195

## About the Role

* 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.

## Description

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., 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., * Build and improve the Durable Objects runtime.

 * Design and develop the 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., * 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 such as game streaming, high-frequency trading, or payment systems.
 * Experience debugging, optimizing, and identifying failure modes in large-scale Linux-based distributed systems.