Look up a company's tech stack
Look up what one company runs, including the backend and internal tools a website scan cannot see, before a call or a piece of research.
Who it's for: A rep, analyst or market researcher who looks up one named company at a time, before a call or for a piece of research.
Stripe mentions Terraform and Kubernetes in a new posting · 3h agoCategory adoption
Klarna mentions dbt in a new posting · 1d agoCategory adoption
Spotify mentions Backstage in a new posting · 2d agoCategory adoption
How finding a company's tech stack works
TheirStack finds a company's tech stack in its job posts, including the backend, data and internal tools a website scan cannot see, so you can look up any company by name or domain and read each technology next to the job posts it was found in.
Look
Look up each company by name or domain
TheirStack opens a company's profile from its name or domain, with its industry, size and open jobs on the same page.
- Company Lookup from the search bar
- Search by name or domain
- Firmographics next to the stack
This week's calls
Stripestripe.com, financial servicesTuesdayKlarnaklarna.com, financial servicesWednesdaySpotifyspotify.com, music streamingFridayRead
Read what it runs, front end to back office
TheirStack lists every technology it found in the company's job posts, with a confidence level and the dates it was first and last seen.
- Technologies found in job posts
- Backend tools a website scan misses
- First and last seen dates
StripeTerraform and Kubernetes in infrastructure roles · 1d agoHighKlarnadbt in analytics engineering roles · 3d agoHighSpotifyBackstage in one platform role · 12d agoMediumCheck
Check the job post behind each technology
TheirStack links every technology to the job posts it was found in, so you can read the exact line before you bring it up on the call.
- Open the job posts behind each tool
- Step by step lookup guide
- Send the stack to HubSpot, or export a CSV
Notes for the call
StripeInfrastructure Engineer post names TerraformInfra automationKlarnaAnalytics Engineer post names dbtData modellingSpotifyPlatform Engineer post names BackstageDeveloper portalLearn how
- Guide
How to Discover Any Company's Tech Stack
Step-by-step guide to finding what technologies any company uses — from backend infrastructure to internal tools — using TheirStack's job-posting-based technographic data.
Look up a company's tech stack: integrations with AI assistants, automations and CRMs
TheirStack works with the AI assistants, automation tools and CRMs you already use: ask Claude or ChatGPT through the MCP server, send new matches to Clay, n8n, Make or Zapier by webhook, and create leads in Salesforce or HubSpot.
AI assistants
Ask Claude, ChatGPT, Cursor or any MCP client to search jobs, companies and tech stacks through the TheirStack MCP server.
MCP server
https://api.theirstack.com/mcpAutomations
TheirStack sends every new matching company by webhook as soon as it finds it, to your automation platform or through it into your CRM and sales tools.
CRMs and sales tools
Run this use case from your own code
curl -X POST https://api.theirstack.com/v1/companies/search \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "company_domain_or": ["stripe.com"] }'
Claude
ChatGPT
Cursor
VS Code
Windsurf
Cline
OpenCode
Gemini
Hermes
OpenClaw
Clay
n8n
Make
Zapier
Databar
Salesforce
HubSpot
Attio
Pipedrive
Apollo
Instantly
ContactOutSee what a company runs before the call.
Look up any company's technology, including the backend tools a website scan can't see.
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