Hi everyone,

I recently received the SDE II - Backend Round 1 assignment from Urban Company, and I thought of sharing it here for discussion and learning purposes. The task is to design and implement a modular Address Book service with in-memory storage and a clean API structure.

🔹 Problem Highlights

Build a modular address book service.

Support Create, Update, Delete, and Search contacts.

Storage should be in-memory (no external DB).

System should be scalable to millions of contacts.

Time & space complexity for search/update should be close to O(1).

Must strictly follow the given API contract.

Should run self-contained on port 5000.

🔹 Tech Guidelines

Allowed languages: Python, Node.js, Java, Go

Use lightweight frameworks like Flask, Express, etc.

Follow modular design:

Models

Controllers / Handlers

Business Logic

Storage layer

🔹 API Contract Overview

POST /create → Create contacts

PUT /update → Update contacts

DELETE /delete → Delete contacts

POST /search → Search contacts

(All requests & responses in JSON; UUIDs for IDs)

Compensation - 35 LPA (32 Base + 3 Joining Bonus)