Senior Software Engineer, Durable Objects (DO)

At Cloudflare, we're on a mission to help build a better Internet.

The Senior Software Engineer, Durable Objects (DO) role is part of the Emerging Technologies & Incubation team, which builds and launches bold new products on Cloudflare's edge network. You'll work on the Durable Objects team, which powers stateful serverless applications for Cloudflare customers.

Responsibilities

• 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.

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

What Makes Cloudflare Special?

Cloudflare is committed to providing equal employment opportunity for all people and places great value in both diversity and inclusiveness.