System Design — AI Specialist (Digital Twin)

Full architecture documents for the four system design prompts in the interview prep.

Files

FileDesign Problem
01-air-gapped-digital-twin-assistant.mdEnd-to-end AI assistant architecture for an air-gapped Geospatial Digital Twin
02-rag-infrastructure-pipeline.mdRAG pipeline for a 100 GB heterogeneous infrastructure document corpus
03-qlora-domain-adaptation-pipeline.mdQLoRA fine-tuning pipeline from data curation to Ollama deployment

How to Use These Documents

These are reference architectures — the gold-standard answers you compare yourself against after attempting a system design whiteboard session.

Workflow:

  1. Read the matching prompt in ../interview-prep/02-system-design-walkthroughs.md
  2. Attempt the design yourself for 45 minutes
  3. Read this document — specifically the sections you struggled with
  4. Note 3 gaps in a personal file; revisit in 3 days

Each document is structured as:

  1. Clarifying Questions
  2. Capacity Estimation
  3. High-Level Architecture (diagram)
  4. Component Deep Dives (3–5 sections)
  5. Trade-offs and Alternatives
  6. Monitoring and Evaluation
  7. Interview Talking Points