From Utility Script to Enterprise-Grade Domain Verifier in 2 Days
"I just needed a few domains. Then I blacked out and built a system."
🛰️ The Spark
Two days ago, I needed to fetch verified domains for a list of companies as part of my day job. Nothing glamorous—just basic ops.
I figured: "Write a quick script, call it a day."
But then the questions started stacking:
- What if the API rate-limits?
- What if I need to retry failures intelligently?
- What if I want this to scale?
- What if… I modularize it?
And that's when the rabbit hole opened.
🛠️ What I Built
✅ A Full Enterprise-Grade Domain Verification Pipeline
Built with:
- Multi-threaded parallel processing
- Rate-limiting using a token bucket algorithm
- Exponential backoff + jitter
- Thread-safe persistent caching
- Text similarity validation using RapidFuzz
- Structured logging and real-time performance metrics
- Disk-backed cache with Polars for blazing-fast I/O
- Docker + Compose with full dev/prod flows
- 90+ tests with pre-commit checks and CI config
- CLI interface, containerized and modular
🚀 Performance gain?
From 0.1082s per match → 0.0030s per match
That's a 35.8x speedup.
⚙️ Why Crunchbase?
I used the Crunchbase API via RapidAPI because:
- It was free.
- I assumed the data was fresh.
Turns out? It wasn't always. So I built a validation module with text similarity scoring to check against expected results. It doesn't just fetch data—it judges it.
💡 From "Just for Me" to "This Might Be Useful"
What started as a one-off script became something worth sharing. I realized:
- Others need this.
- It could be generalized into a B2B verification layer.
- It might deserve a GUI + billing layer.
"Would you use this if it had Stripe billing + a FastAPI GUI?"
(If you're in sales ops, lead gen, fraud prevention, or data hygiene—this might save you hours.)
🧱 Tech Stack
- Python 3.9+
- RapidFuzz + Polars + DiskCache + orjson
- Docker + Docker Compose
- pytest + coverage + pre-commit
- CLI-ready, containerized, modular
🧬 What's Next?
Coming soon:
- 🧠 LLM-based domain validation and judgment scoring
- 🌐 GUI via FastAPI
- 💸 Stripe integration for self-serve billing
- 📦 SaaS packaging for teams
📬 Want Early Access?
I'm building this in public.
Drop your email via contact form or DM me @mebroskee if:
- You want to try it out early
- You work with messy domain data
- You want to help shape the roadmap
🔗 GitHub + README
Fork it, remix it, deploy it. It's yours now.
⚡ Closing Reflection
I didn't know how to build like this three months ago.
I've been learning in the open, guided by curiosity, LLMs, and the will to just build what I need.
If you're somewhere between "I have an idea" and "I ship systems now"—then welcome. Let's build.
