Callosum Jobs (12 Open Roles) and Hiring Activity

No roles opened or closed at Callosum in the last two weeks, or the board is new to our tracking. Its activity will show here as it changes.

Newest Callosum jobs

Role	Location	Posted
Expression of Interest - Internships London · 2026-09-23	London	2026-09-23
Security Lead - Member of Technical Staff London · 2026-08-20	London	2026-08-20
Research Engineer, Evals - Member of Technical Staff London · 2026-08-20	London	2026-08-20
Agent Runtime & Systems - Member of Technical Staff London · 2026-08-20	London	2026-08-20
ML Research Engineer - Member of Technical Staff London · 2026-08-20	London	2026-08-20
Evolutionary Optimisation - Member of Technical Staff London · 2026-08-20	London	2026-08-20
Research Engineer, Benchmarking - Member of Technical Staff London · 2026-08-20	London	2026-08-20
Networking & Interconnect Systems - Member of Technical Staff London · 2026-08-20	London	2026-08-20
Inference Performance & Deployment - Member of Technical Staff London · 2026-05-20	London	2026-05-20
Inference Engine Development - Member of Technical Staff London · 2026-05-20	London	2026-05-20
████████ ██████ ████	██████, ██	2026-██-██
████████ ██████ ████	██████, ██	2026-██-██
🔒 2 more roles at Callosum, with full descriptions, salaries and seniority, are in the API. Get the full list free →

Each role links to the posting on Callosum's own career site.

Questions the API answers about Callosum

Each count is one API parameter away from the full list.

10senior, lead and management rolesseniority=senior,lead,manager,director,executive🔒roles that state a salary in the descriptionhas_salary=true🔒roles that say they sponsor visasvisa_sponsorship=true

Where Callosum is hiring

Location	Jobs
London	12 (100%)

Teams

Team	Jobs
Compute & Infrastructure	5 (42%)
General Capabilities	3 (25%)
Expression of Interest	2 (17%)
Applied AI	1 (8%)
Office of the CTO	1 (8%)

Seniority

Seniority (from the job title)	Jobs
Lead	10

Pay

Callosum's job list doesn't include salaries. The API reads each full description and pulls out the salary when the posting states one, so you can filter Callosum's roles by minimum pay.

Get Callosum's full job feed

One call returns every open Callosum role as JSON. Add filters such as remote=true or posted_after= to fetch only what's new since your last call.

curl --get "https://job-search-api-career-site-jobs.p.rapidapi.com/company" \
  --data-urlencode "company=https://jobs.ashbyhq.com/callosum" \
  -H "X-RapidAPI-Key: YOUR_KEY" \
  -H "X-RapidAPI-Host: job-search-api-career-site-jobs.p.rapidapi.com"

Example response

{
  "company": "Callosum",
  "title": "Expression of Interest - Internships",
  "location": "London",
  "isRemote": false,
  "employmentType": "internship",
  "postedAt": "2026-09-23",
  "ats": "ashby",
  "seniority": null,
  "salaryMin": "…",
  "salaryMax": "…",
  "salaryCurrency": "…",
  "yearsExperienceMin": "…",
  "visaSponsorship": "…",
  "descriptionText": "… the full job description …",
  "applyUrl": "https://jobs.ashbyhq.com/callosum/4ac29d00-3b3c-4c53-8a1f-1798198f5b30"
}

Get the full feed through the Job Search API
Every role, full descriptions, salaries, seniority, a minimum-salary filter and a live check that drops closed jobs. Free plan, no card needed.

Try it free →

More companies hiring on Ashby

All companies using Ashby →

Data from Callosum's public Ashby job board, refreshed 2026-10-30. Clean Feeds is not affiliated with Callosum. Questions or removal requests: hello@getcleanfeeds.com.

Callosum jobs and hiring activity