Design a Resilient Document Aggregation Service

Company: Wells Fargo

Role: Software Engineer

Category: System Design

Difficulty: medium

Interview Round: Technical Screen

Quick Answer: This system design question tests a candidate's ability to architect a fault-tolerant, high-throughput data aggregation service involving concurrent downstream API calls, resilience patterns, and read/write separation. It evaluates practical mastery of distributed systems concepts including circuit breakers, dead letter queues, CQRS, and eventual consistency at scale.