Implement A Mobile Chat Interface In An Existing Codebase
Company: OpenAI
Role: iOS Engineer
Category: Software Engineering Fundamentals
Difficulty: medium
Interview Round: Technical Screen
Overview: Prepare for a mobile engineering prompt about implementing a ChatGPT-style chat interface inside an unfamiliar existing codebase. The interview focuses on prioritization, matching project patterns, building a working UI slice, error states, networking trade-offs, and compile-run discipline.
Read the full OpenAI iOS Engineer interview experience this question came from