Most developers “use APIs.”
Very few understand how APIs actually power systems.
That’s the difference between writing code…
and building scalable products.
Here’s how APIs really work 👇
APIs
│
├── Open APIs (External systems)
│ ├── REST API
│ │ ├── Weather data
│ │ ├── Login/auth systems
│ │ └── Product information
│ │
│ ├── SOAP API
│ │ ├── Bank transfers
│ │ ├── Insurance claims
│ │ └── Government records
│ │
│ └── GraphQL API
│ ├── Social feeds (Facebook, etc.)
│ ├── GitHub stats
│ └── Custom queries (fetch only what you need)
│
├── Internal APIs (Your system backbone)
│ ├── Frontend ↔ Backend
│ │ ├── Login requests
│ │ ├── Profile fetch
│ │ └── Live search
│ │
│ ├── Backend ↔ Backend
│ │ └── Microservices communication
│ │
│ └── Service ↔ Database
│ ├── User insert/update
│ └── Reports & queries
│
└── Partner APIs (Business integrations)
├── B2B Integrations
│ ├── Payment gateways
│ ├── Airline / hotel booking
│ └── External service data
│
├── Affiliate Systems
│ ├── Product links
│ ├── Commission tracking
│ └── Click analytics
│
└── Data Sharing APIs
├── Health records
├── Finance data
└── Logistics tracking
Now the important part:
Most people stop at “calling APIs.”
But real engineers think like this:
→ Where does this API fit in the system?
→ Is it external, internal, or partner-level?
→ How does data flow between layers?
→ Can this scale when users grow 10x?
Because in real-world applications:
• Open APIs bring data
• Internal APIs run your product
• Partner APIs grow your business
That’s how companies build:
→ SaaS platforms
→ Marketplaces
→ Fintech systems
→ Scalable products
The shift is simple:
Amateurs → Call endpoints
Professionals → Design API architecture
If you understand APIs like this,
you don’t just build features…
You build systems.
♻️ Repost to help someone
🇹🇷 İşte hayalini kurduğumuz paylaşım, işte Türkiye GP’sinin başlangıç anı…🥲
🇹🇷 Asın bayrakları...🥲
🇹🇷 Çok uzun zamandır bu an için çalışıyorduk, bu anı hayal ediyorduk…🥲
🇹🇷 Çok şükür, bugünü gördük...🥲
🇹🇷 Formula 1 Türkiye'ye, #turkishgp takvime geri döndü…🥲