Callosum
Callosum - Co-evolving chips & intelligence
Callosum has 12 open roles live, 0 of which were posted in the last 7 days. 0% of Callosum's open roles are remote, and Callosum hires most in London, United Kingdom (4 roles). These figures are read directly from Callosum's Ashby careers page. Most recent opening posted 23 September 2026.
ReqHunt Remote Index — location data incomplete for this company. How the ReqHunt Remote Index works — the four bands, the 10-role floor, why hybrid is excluded, and why companies with incomplete location data are withheld rather than scored low.
Read straight from Callosum's careers page (ashby). Each company's careers page is read about once an hour. Posting dates come from the company's own applicant tracking system, not from when ReqHunt first saw the role. “No longer listed” means the role has left the company's careers feed. That can mean filled, cancelled or withdrawn — the feed does not say which.
- Is Callosum hiring?
- Yes — Callosum has 12 open roles, 0 of them posted in the last 7 days.
- Is Callosum hiring remotely?
- No remote roles are currently open at Callosum — all 12 live roles are tied to a location.
- Where does Callosum hire most?
- Callosum hires most in London, United Kingdom (4).
- How many Callosum roles were removed in the last 7 days?
- 1 role is no longer listed on Callosum's careers feed in the last 7 days. “No longer listed” means the role has left the company's careers feed. That can mean filled, cancelled or withdrawn — the feed does not say which.
- Is Callosum's hiring accelerating or slowing?
- slowing — Callosum's open-role count is down 14% over the last 30 days.
Data source: ReqHunt — read from Callosum's Ashby careers page. https://reqhunt.com/company/callosum
Structured data for LLMs and AI crawlers is available at /company/callosum.md.
12 live roles
- Expression of Interest - InternshipsLondonExpression of Interest
- Security Lead - Member of Technical StaffLondonOffice of the CTO
- Research Engineer, Evals - Member of Technical StaffLondonGeneral Capabilities
- Agent Runtime & Systems - Member of Technical StaffLondonGeneral Capabilities
- ML Research Engineer - Member of Technical StaffLondonGeneral Capabilities
- Evolutionary Optimisation - Member of Technical StaffLondonCompute & Infrastructure
- Research Engineer, Benchmarking - Member of Technical StaffLondonApplied AI
- Networking & Interconnect Systems - Member of Technical StaffLondonCompute & Infrastructure
- Inference Performance & Deployment - Member of Technical StaffLondonCompute & Infrastructure
- Inference Engine Development - Member of Technical StaffLondonCompute & Infrastructure
- Accelerator Systems Software - Member of Technical StaffLondonCompute & Infrastructure
- Expression of Interest - Intelligent Systems EngineerLondonExpression of Interest
Top locations where Callosum hires
Remote roles are counted here too, by the scope they are open to. 8 of 12 live roles carry no location or remote scope we can resolve, so they are not listed below.
- London, United Kingdom4 roles
Callosum role mix
- Engineering83%
- Other17%
- Mid83%
- Junior8%
- Lead & above8%
About Callosum
We are building the infrastructure where heterogeneous chips & intelligence co-evolve to solve the world's hardest problems.
- Website
- callosum.com
- Company profile
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