Callosum careers
It operates at the level of systems, not models, to unlock orders-of-magnitude improvements in capabilities and cost.
Open roles
10
Founded
2025
Headcount
28
Remote roles
10%
10 open
Open roles at Callosum
Callosum
London
Security Lead - Member of Technical Staff
London
—
today
Callosum
London
Research Engineer, Evals - Member of Technical Staff
London
$136k–$259k
today
Callosum
London
Agent Runtime & Systems - Member of Technical Staff
London
$136k–$259k
today
Callosum
London
ML Research Engineer - Member of Technical Staff
London
$136k–$259k
today
Callosum
London
Evolutionary Optimisation - Member of Technical Staff
London
$136k–$259k
today
Callosum
London
Research Engineer, Benchmarking - Member of Technical Staff
London
$136k–$259k
today
Callosum
London
Networking & Interconnect Systems - Member of Technical Staff
London
$136k–$259k
today
Callosum
London
Inference Performance & Deployment - Member of Technical Staff
London
$136k–$259k
4w ago
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Frequently asked
Is Callosum hiring right now?
Yes. Callosum has 10 open roles live on its own careers page today, and the list above refreshes daily.
Does Callosum hire remote?
About 10% of Callosum’s open roles are remote. The rest are based in its offices, including London, GB.
What does Callosum pay?
Across the Callosum postings that list pay, the middle of the range runs $136k–$259k.
How do I apply to Callosum?
Every role above links to Callosum’s own application. Or let Enzo apply for you: it fills the company’s form with your profile and writes the answers for each role.
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