# Callosum

> Hiring pulse for Callosum: open postings over time. Source: https://alderhq.app/companies/callosum (read 2026-11-03).

## Hiring (observed)

- Open roles: 12
- New postings: 0 in 30 days, 0 in 90 days
- Taken down: 0 in 30 days
- Board last checked: 2026-11-03
- Open roles by family: Software engineering 7, ML / AI 3, Other 1, Security 1

## Pay and sponsorship

- Open roles with pay posted: 0 of 12
- Licensed UK sponsor (London): checked 2026-11-03 ([register](https://www.gov.uk/government/publications/register-of-licensed-sponsors-workers))

## Open roles (newest 12)

- [Expression of Interest - Intelligent Systems Engineer](https://alderhq.app/jobs/ashby%3Acallosum%3A49df3034-21c5-47da-b63f-22bf1ab7b893) · Onsite · United Kingdom
- [Inference Engine Development - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3A1dcfaab8-ec0e-4374-9880-a1b65465b458) · Onsite · United Kingdom
- [Accelerator Systems Software - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3A35a8cced-2c23-431a-8198-9dacdaaad9d3) · Onsite · United Kingdom
- [Inference Performance & Deployment - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3A2e9b3645-074e-48bf-9edb-c04efdfd95d7) · Onsite · United Kingdom
- [Agent Runtime & Systems - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3Ac342204a-6bb8-47ae-a926-049a50e950ae) · Onsite · United Kingdom
- [Expression of Interest - Internships](https://alderhq.app/jobs/ashby%3Acallosum%3A4ac29d00-3b3c-4c53-8a1f-1798198f5b30) · Onsite · United Kingdom
- [Networking & Interconnect Systems - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3A8262ffb3-fcc0-4b71-8446-61b4316a4561) · Onsite · United Kingdom
- [Research Engineer, Evals - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3A07abc888-1e91-4a04-ba37-f463ae7e864c) · Onsite · United Kingdom
- [Evolutionary Optimisation - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3A8c29b53f-f173-4192-b61d-952c577bd001) · Onsite · United Kingdom
- [Research Engineer, Benchmarking - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3A71c6dcb8-4dda-4511-ab88-61523b8832fa) · Onsite · United Kingdom
- [Security Lead - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3Aab687a5e-300e-419a-b1b5-449013680e81) · Onsite · United Kingdom
- [ML Research Engineer - Member of Technical Staff](https://alderhq.app/jobs/ashby%3Acallosum%3Ae386b6dd-5cb6-4f54-a690-87f136f9c8e7) · Onsite · United Kingdom

---
Data: alder (https://alderhq.app). Cite https://alderhq.app/companies/callosum and the date you read it. Hiring pulse counts postings, not headcount.