Agent Runtime & Systems - Member of Technical Staff
Callosum is hiring for Agent Runtime & Systems - Member of Technical Staff in London. Staff level. First seen August 21, 2026; open as of November 12, 2026. Jobs taken straight from company career pages — no aggregator in between.
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- Company
- Callosum
- Where
- London
- Level
- Staff
- First seen
- August 21, 2026
- Listed via
- Ashby
What the posting says
Sitting at the heart of our technical mission, this position owns the runtime and programming model for long-running agent systems. Your focus will span durable execution, checkpointing and replay, distributed scheduling, secure tool execution, and end-to-end observability. You will develop the core software that makes agent workflows reliable, debuggable, reproducible, and efficient as we expand our model and tool footprint. This is a high-leverage role tackling complex systems challenges across the entire stack. Runtime, observability tooling, and framework design are three separate…
Read more and apply on Callosum's site
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