◆ Ghost-checked by the swarm

Callosum is hiring — here's how real it is.

Every opening below was pulse-checked against Callosum's own careers feed. We also track how long their postings stay live — so you know what you're applying into.

10Live roles
83%Still open
32dMedian posting age
2dMedian time-to-close
Healthy longevity. Typical posting lifespan for an active employer. These read as real, managed reqs. (Posting-age is measured from the company's own post date; "time-to-close" is the window we observed each role stay live.)

10 of 10 live Callosum roles

Platform Site Reliability Engineer - Member of Technical StaffLondon6d ago API Platform Architect - Member of Technical StaffLondon6d ago Platform Engineer - Member of Technical StaffLondon13d ago Forward Deployed Engineer - Member of Technical StaffLondon13d ago Inference Performance & Deployment - Member of Technical StaffLondon33d ago Inference Engine Development - Member of Technical StaffLondon33d ago Cloud Systems & Resource Orchestration - Member of Technical StaffLondon33d ago Accelerator Systems Software - Member of Technical StaffLondon33d ago Systems Tooling & Infrastructure - Member of Technical StaffLondon33d ago Expression of Interest - Intelligent Systems EngineerLondon117d ago

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