Railway Tools API Integration

I already have a complete front-end for seven railway utilities—PNR status, Live Train Status, Trains Between Stations, Seat Availability, Train Schedule, Fare Enquiry and Station Info. What I now need is the wiring that makes each page come alive.

You will work exclusively with REST APIs; the provider will share full documentation as soon as we start. Your job is to connect every endpoint to the existing UI, add a lightweight backend layer (any mainstream stack is fine) to handle API keys securely, and display a friendly loading state while data is fetched. If something goes wrong, the user should see a clear error message; no further logging or retry logic is required.

Scope at a glance
• Hook up all seven tools to their respective REST endpoints
• Build a minimal backend proxy for key protection and CORS control
• Implement simple loader and on-screen error message for failed calls
• Keep the current design intact—no layout or feature changes

Everything needs to be turned around in 3–4 days. The budget is ₹4,000–₹5,000 fixed; please confirm you can deliver within that range and timeline.