Design the Security Architecture for an LLM Chatbot Product

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Quick Overview

A system design question on securing a chatbot built on a large language model that talks with people outside the company. It tests threat modeling for prompt injection and data leakage, user authentication and tool authorization outside the model, tenant isolation, sensitive-data handling, abuse controls, auditing and incident response.

Design the Security Architecture for an LLM Chatbot Product

Company: Decagon

Role: Software Engineer

Category: System Design

Difficulty: medium

Interview Round: Onsite

Overview: A system design question on securing a chatbot built on a large language model that talks with people outside the company. It tests threat modeling for prompt injection and data leakage, user authentication and tool authorization outside the model, tenant isolation, sensitive-data handling, abuse controls, auditing and incident response.

Read the full Decagon Software Engineer interview experience this question came from

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Decagon
Sep 18, 2026
mediumSoftware EngineerOnsiteSystem Design
35
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