How to Discover Any Company's Tech Stack | TheirStack

You've got a target company and you want to know what technologies they use — their databases, cloud infrastructure, internal tools, DevOps stack, everything. Maybe you're researching a prospect before a sales call, scoping out a competitor, or evaluating a potential partner.

The problem with most tech stack lookup tools is they only scan a company's website, which means they only detect front-end technologies like analytics scripts, marketing pixels, and JavaScript frameworks. The backend — where the real technology decisions happen — stays invisible.

Job postings change that. When a company hires a "Senior Engineer with Snowflake and Kubernetes experience," they've just told you two technologies in their stack that no website crawler would ever find. TheirStack analyzes millions of job postings to build technology profiles for 11M+ companies, covering 32k+ technologies.

Here are two ways to discover a company's tech stack.

Method 1: Look up a company in the app

The fastest way to check a single company's tech stack. Use the company lookup feature — search by company name or domain, open the company profile, and review the Technologies tab. Each technology shows its confidence level and the source job postings, so you can verify every detection yourself.

For a full walkthrough with screenshots, see the company lookup documentation.

Method 2: Look up a company via the API

If you need to check tech stacks programmatically — for CRM enrichment, automated research, or integration into your own tools — use the Technographics API endpoint.

curl -X POST "https://api.theirstack.com/v1/companies/technologies" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "company_domain": "stripe.com"
  }'

The response lists all technologies detected for the company. For each technology, it returns the confidence level (low, medium, high), the number of jobs that mention it, and the first and last dates it was mentioned.

Each lookup consumes 3 API credits per company, regardless of the number of technologies returned. It doesn't consume credits if there is no response.

You can identify the company by passing company_domain, company_name, or company_linkedin_url. See the full Technographics API reference for all parameters and response fields.

What you'll find — and why job postings reveal more

TheirStack detects technologies across categories that website crawlers simply cannot reach:

• Backend and databases: PostgreSQL, MongoDB, Snowflake, BigQuery, Redis, Elasticsearch
• DevOps and infrastructure: Kubernetes, Terraform, Docker, AWS/GCP/Azure services, CI/CD tools
• Data engineering: Spark, Airflow, Kafka, dbt, Fivetran
• Internal tools: Salesforce, Workday, ServiceNow, Jira, Confluence
• Security: Okta, CrowdStrike, Splunk, HashiCorp Vault
• Frontend and mobile: React, Angular, Swift, Kotlin (also detectable, but less unique to job-posting data)

Traditional technographic tools scan websites and detect what's in the HTML — analytics tags, ad pixels, CMS platforms, JavaScript libraries. That's useful but limited. Job postings reveal the full iceberg: the backend infrastructure, cloud platform, data stack, and internal tooling that runs the business.

TheirStack tracks 32k+ technologies across 11M+ companies worldwide by analyzing millions of job postings. For details on our detection methodology and confidence scoring, see how we source tech stack data.

Further reading