Callosum, the Intelligent Systems Company, is building an agent runtime for long-running workflows and distributed infrastructures in London. You will own the runtime and programming model for durable, scalable agent systems, focusing on execution, checkpointing, and observability across the stack.
We expect strong expertise in distributed systems, Python, and a systems language like Rust/C++/Go, plus experience with modern ML tooling and open‑source projects.
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