Local Delivery Service

Difficulty: Easy

What It Tests

Geo-matching, assignment, routing basics.

Topics Covered

• API Design
• Proximity / Geo Search
• Database Design: SQL vs NoSQL
• Load Balancing
• Scaling Fundamentals

Hello Interview Breakdown

Read the full Hello Interview breakdown →

Approach Hints

• Use geohash to find nearby couriers within a radius
• Assign orders using a priority queue (proximity + load)
• Track courier location updates via periodic polling or WebSocket
• Store order state machine in a relational DB

Video Walkthroughs

• System Design of Doordash: Geo-Hashing and WebSockets for Location Based Services →
• Design Uber Eats | System Design Interview (with Senior Netflix Engineer, Ex-Microsoft) →