The Backend Question
Node.js or Python for your SaaS backend?
We built production systems in both. Here's the honest comparison.
Node.js
The Good
- Same language as frontend
- Huge ecosystem (npm)
- Fast for I/O-heavy work
- Great for real-time (WebSockets)
The Not-So-Good
- CPU-intensive tasks slower
- Callback hell (use async/await)
- TypeScript adds complexity
Python
The Good
- Fast to write
- Excellent for data/ML
- Clean syntax
- Great libraries
The Not-So-Good
- Different language from frontend
- Slower runtime
- GIL limitations for concurrency
When Node.js Wins
- JSON-heavy APIs
- Real-time features
- WebSockets
- Microservices with TypeScript
When Python Wins
- Data processing
- ML/AI features
- Quick prototyping
- Scientific computing
What We Use
For most SaaS: Node.js.
Same language as our frontend. Huge ecosystem. Fast enough.
When we need ML/AI: Python microservices.
Hybrid approach works.
