tech-stack-detective

name

tech-stack-detective

description

Reverse-engineer a company's tech stack from public signals — job listings, StackShare, GitHub, engineering blog, and their live website. Use this skill when a user asks "what tech does Stripe use", "what's Linear's stack", "what does Notion run on", "reverse engineer [company]'s tech stack", "what framework does [company] use", "how is [company] built", "what languages does [company] hire for", or any request to figure out what technology a company uses under the hood.

Tech Stack Detective

Reverse-engineer any company's tech stack from public signals — job listings, StackShare, GitHub, engineering blog, and their live website — then return a layered map of what they actually run.

Pre-flight Check (REQUIRED)

Before making any TinyFish call, always run BOTH checks:

1. CLI installed?

which tinyfish && tinyfish --version || echo "TINYFISH_CLI_NOT_INSTALLED"

If not installed, stop and tell the user:

Install the TinyFish CLI: npm install -g @tiny-fish/cli

2. Authenticated?

tinyfish auth status

If not authenticated, stop and tell the user:

You need a TinyFish API key. Get one at: https://agent.tinyfish.ai/api-keys

Then authenticate:

tinyfish auth login

Do NOT proceed until both checks pass.

---

Step 1 — Gather inputs

You need:

• Company name — e.g. Stripe, Linear, Vercel, Notion
• Company domain — e.g. stripe.com (infer from company name for well-known companies, ask if unsure)

Optional:

• Area of interest — e.g. "just the frontend", "their data pipeline", "what they use for auth" (if specified, focus the output on that layer)

---

Step 2 — Parallel research

Fire all 5 agents simultaneously.

# Agent 1 — StackShare profile
tinyfish agent run \
  --url "https://stackshare.io/{COMPANY_SLUG}" \
  "You are on the StackShare profile for {COMPANY}.
   Extract their full tech stack as listed:
   - All tools and services listed under each category
   - Category names (e.g. Languages, Frameworks, Data Stores, DevOps, etc.)
   - Any tools listed as 'used by' this company
   STRICT RULES:
   - Do NOT click any tool links
   - Do NOT navigate away
   - Read only what is visible on this page
   - If the page returns 404 or no company found, return {found: false}
   Return JSON: {found: bool, stack: [{category, tools: []}]}" \
  --sync > /tmp/tsd_stackshare.json &

# Agent 2 — Job listings (tech signals from requirements)
tinyfish agent run \
  --url "https://www.linkedin.com/jobs/search/?keywords={COMPANY_ENCODED}+engineer" \
  "You are on LinkedIn job listings for {COMPANY}.
   Read the job titles and visible snippets for engineering roles.
   Extract all technologies, languages, frameworks, and tools mentioned in:
   - Job titles
   - Visible job description snippets
   Focus on: programming languages, frameworks, databases, cloud providers, tooling.
   STRICT RULES:
   - Do NOT click any job listing
   - Read only titles and visible preview text
   - Maximum 15 listings then stop
   - Deduplicate — list each technology once
   Return JSON: {technologies: [{name, category, mention_count}]}" \
  --sync > /tmp/tsd_linkedin.json &

# Agent 3 — GitHub organization
tinyfish agent run \
  --url "https://github.com/{COMPANY_SLUG}" \
  "You are on the GitHub organization page for {COMPANY}.
   Extract signals about their tech stack from public repositories:
   - Top 6 pinned or most-starred repositories
   - Primary programming languages used across repos (visible in language bars)
   - Any infrastructure or tooling repos (e.g. terraform, kubernetes configs, SDKs)
   - Any open source projects that reveal their internal stack
   STRICT RULES:
   - Do NOT click into any repository
   - Read only what is visible on the org page
   - If no org found, return {found: false}
   Return JSON: {found: bool, top_repos: [{name, description, language, stars}], languages: [], infra_signals: []}" \
  --sync > /tmp/tsd_github.json &

# Agent 4 — Engineering blog
tinyfish agent run \
  --url "https://www.google.com/search?q=site:{COMPANY_DOMAIN}+engineering+OR+blog+OR+tech" \
  "You are on Google search results for the engineering blog of {COMPANY} at {COMPANY_DOMAIN}.
   Find the engineering or tech blog URL, then read the visible post titles and snippets.
   Extract:
   - Technologies, tools, or architectural decisions mentioned in post titles and snippets
   - Any posts about infrastructure, scaling, or architecture decisions
   - Any open source tools they built or adopted
   STRICT RULES:
   - Do NOT click any links
   - Read only titles and snippets visible in search results
   - Maximum 10 results then stop
   Return JSON: {blog_url, tech_signals: [{technology, context}], architecture_posts: [{title, snippet}]}" \
  -- > /tmp/tsd_blog.json &


tinyfish agent run \
  --url  \
   \
  -- > /tmp/tsd_website.json &



  &&  /tmp/tsd_stackshare.json
  &&  /tmp/tsd_linkedin.json
  &&  /tmp/tsd_github.json
  &&  /tmp/tsd_blog.json
  &&  /tmp/tsd_website.json

Before running, replace:

• {COMPANY} — e.g. Stripe
• {COMPANY_SLUG} — lowercase, hyphenated e.g. stripe
• {COMPANY_ENCODED} — URL-encoded e.g. Stripe
• {COMPANY_DOMAIN} — e.g. stripe.com

---

Step 3 — Synthesize the stack map

Combine signals from all sources. Assign a confidence level to each technology based on how many sources confirmed it:

• High confidence — mentioned in 3+ sources or explicitly listed on StackShare
• Medium confidence — mentioned in 2 sources or inferred from job listings
• Low confidence — mentioned in only 1 source or inferred from indirect signals

## Tech Stack — {COMPANY}

*Reverse-engineered from StackShare, job listings, GitHub, engineering blog, and live site analysis*
*Data fetched: {date}*

---

### 🖥️ Frontend
| Technology | Confidence | Source |
|---|---|---|
| {tech} | 🟢 High / 🟡 Medium / 🔴 Low | {sources} |

### ⚙️ Backend
| Technology | Confidence | Source |
|---|---|---|

### 🗄️ Data & Storage
| Technology | Confidence | Source |
|---|---|---|

### ☁️ Infrastructure & DevOps
| Technology | Confidence | Source |
|---|---|---|

### 📊 Analytics & Monitoring
| Technology | Confidence | Source |
|---|---|---|

### 🔧 Developer Tooling
| Technology | Confidence | Source |
|---|---|---|

---

### 🧠 Key Architectural Signals
{2-4 bullet points on notable architectural choices inferred from the research}
- e.g. "Strong Go + Rust signals in job listings suggest performance-critical backend services"
- e.g. "Multiple Kubernetes and Terraform repos on GitHub indicate heavy infrastructure-as-code culture"

---

### 🔍 Sources
- StackShare: {found / not found}
- Job listings: {N} engineering roles analyzed
- GitHub: {N} public repos
- Engineering blog: {blog_url or not found}
- Live site analysis: {COMPANY_DOMAIN}

### ⚠️ Low Confidence Items
{List technologies with only 1 source signal and what that signal was}

---

Edge Cases

• StackShare profile doesn't exist — skip it, rely on other 4 sources, note the gap
• Company GitHub org not found — try common variations ({company}hq, {company}-inc, {company}io) before giving up
• Private company with minimal public presence — job listings and website analysis will be the richest sources; be upfront about confidence levels
• Very large company (Google, Meta, Amazon) — stack is extremely diverse; ask if the user wants a specific team or product area, otherwise summarize known public stacks
• Startup with almost no public signals — be honest: "Limited public signals found. Based on job listings alone: [findings]"
• Company uses different names on GitHub vs LinkedIn — use the domain as the anchor and note the discrepancy