Callosum's tech stack
What does Callosum use?
Callosum (callosum.com) uses at least 18 tools we can see from public records, including Vercel for hosting, Google Workspace for email and documents, Google Analytics for analytics and Sanity for its website. Last checked .
- Company page
- Tools found
- 18
- Categories
- 11
- Layers
- 5 of 5
- Last checked
- Oct 2026
Callosum's stack, layer by layer
Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.
Edge & Hosting
3 tools, where the bytes are served from
Application
4 tools, what the product is built with
Media & UI
Data & Observability
3 tools, what they measure and store
Go-to-market
5 tools, how they find and keep customers
Website & CMS
Marketing
Company Ops
3 tools, what the team runs on day to day
People & HR
Hiring at Callosum
13 open roles on Callosum's public Ashby job board, 2 posted in the last 30 days.
Open roles by team
- Engineering9
- Data & AI2
- Other2
Latest openings
- Applied AI - Member of Technical StaffLondon · Oct 2026
- Expression of Interest - InternshipsLondon · Sep 2026
- Security Lead - Member of Technical StaffLondon · Aug 2026
- Research Engineer, Evals - Member of Technical StaffLondon · Aug 2026
- Agent Runtime & Systems - Member of Technical StaffLondon · Aug 2026
- ML Research Engineer - Member of Technical StaffLondon · Aug 2026
Checked October 16, 2026.
Companies like Callosum also use
Tools common among companies with a similar stack that we haven't found at Callosum.
Companies with a stack like Callosum's
Ranked by shared tools, with rare tools counting more.
BirgoReal Estate · 51–200 people8in common
L.A. Insurancelainsurance.com7in common
SweetspotEngineering, Product and Design · 1–10 people7in common
Palladyne AIRobotics7in common
Artisan Capital GroupReal Estate · 11–50 people1in common
MochiContent · 1–10 people5in common
Bookmans Entertainment ExchangeRetail · 201–1,000 people5in common
Your Site TitleFinancial Services · 51–200 people3in common
Callosum tech stack FAQ
What tools does Callosum use?
As of October 2026, runsonwhat has found 18 tools at Callosum (callosum.com) in public records. Edge & Hosting: Cloudflare, GoDaddy and Vercel. Application: React, Tailwind CSS and Next.js. Data & Observability: Google Analytics, Google Tag Manager and Vercel Analytics. Go-to-market: Google Ads, LinkedIn Insight Tag and X Ads. Company Ops: Google Workspace, Apple Business and Rippling. Last checked October 7, 2026.
What cloud does Callosum run on?
Callosum uses Vercel for hosting and cloud infrastructure, according to runsonwhat (October 2026). runsonwhat found Vercel through a subdomain that points at Vercel and DNS records. Vercel is used by 46,408 companies runsonwhat tracks.
What email provider does Callosum use?
Callosum uses Google Workspace for email and office software, alongside Apple Business, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace and code on callosum.com. Google Workspace is used by 397,526 companies runsonwhat tracks.
What analytics tools does Callosum use?
Callosum uses Google Analytics for analytics, alongside Google Tag Manager and Vercel Analytics, according to runsonwhat (October 2026). runsonwhat found Google Analytics through Google Analytics code on callosum.com. Google Analytics is used by 851,941 companies runsonwhat tracks.
What is Callosum's website built with?
Callosum uses Sanity for its website, according to runsonwhat (October 2026). runsonwhat found Sanity through Sanity code on callosum.com. Sanity is used by 4,697 companies runsonwhat tracks.
What marketing software does Callosum use?
Callosum uses LinkedIn for marketing, according to runsonwhat (October 2026). runsonwhat found LinkedIn through a DNS verification record for LinkedIn. LinkedIn is used by 14,667 companies runsonwhat tracks.
Does Callosum use Cloudflare?
Yes. runsonwhat found Cloudflare at Callosum through Cloudflare code on callosum.com. Cloudflare is a CDN & Edge tool used by 692,170 companies runsonwhat tracks.
Is Callosum hiring?
Yes. As of October 2026, Callosum has 13 open roles on its public Ashby job board, most in engineering (9) and data & AI (2). 2 were posted in the last 30 days.
Which companies have a tech stack similar to Callosum's?
The companies with the stacks most like Callosum's are Birgo, L.A. Insurance, Sweetspot and Palladyne AI, according to runsonwhat (October 2026). Each shares 7 to 8 tools with Callosum, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.
How does runsonwhat know what Callosum uses?
runsonwhat reads public records only. Of the 18 tools at Callosum, 12 were found through code on callosum.com, 4 through DNS records, 1 through email records and 1 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and callosum.com about monthly.
We read public traces only: DNS and email records, certificate logs, website code and published subprocessor lists. A tool is listed when a direct record backs it up, and dropped when a recheck no longer finds it. Is this your company? See how to opt out.