These questions focus on backend development challenges you might encounter while building a multi-tenant WhatsApp automation platform for businesses.
We're interested in your thought process, problem-solving approach, and technical reasoning rather than perfect answers.
Duration: 30-45 minutes | Format: Technical discussion with examples
1
Multi-Tenant Data Isolation
We have 50+ gym and trek companies using our platform. If Gym A sends a WhatsApp message, how would you ensure their conversation data never accidentally shows up in Gym B's dashboard? Walk me through your database design.
2
WhatsApp Webhook Performance
WhatsApp expects us to respond to webhooks within 5 seconds or they'll retry. If we need to generate a trek itinerary PDF, qualify a lead, and send a response - how do you handle this without timing out?
3
Real-World Debugging
A gym owner calls saying 'My WhatsApp bot is responding to trek messages instead of gym messages.' Your logs show the tenant_id is correct. What could be wrong and how do you debug this?
4
Database Schema Design
Different gyms want different membership plans - some have 3 plans, others have 10. Trek companies have different difficulty levels and group sizes. How do you design a flexible database schema for this?
5
API Design Under Load
We're processing 1000+ WhatsApp messages per minute across all tenants. Your API endpoint is getting slow. How do you identify the bottleneck and fix it?