System Design Mock Interviews for Senior .NET Developers
Practice with realistic system design prompts, pause-and-design format, and scoring rubrics. Get comfortable with follow-ups, trade-offs, and time pressure before your real interview.
How the Mock Interviews Work
Watch the Problem
A real system design prompt is presented — exactly as you’d see it in a live interview, with time constraints.
Design Your Solution
Pause the video and work through your design. Use the provided whiteboard template or your own notes.
See the Model Answer
Watch a full walkthrough of the ideal solution, covering all the trade-offs and edge cases an interviewer would probe.
Score & Improve
Use the scoring rubric to grade yourself. Identify gaps, review feedback notes, and track progress over time.
How We Grade Your Design
The same rubric FAANG companies use to evaluate candidates — broken down so you know exactly where to focus.
Problem Clarification
Did you ask the right questions before diving in? Scope, constraints, and requirements identification.
High-Level Design
Is your architecture sound? Component selection, data flow, and system boundaries.
Deep Dive & Trade-offs
Can you explain WHY you made each choice? Consistency vs availability, latency vs throughput.
API Design
Are your endpoints logical, RESTful, and versioned correctly? Does the interface feel clean?
Scalability & Edge Cases
Did you think about what happens at 10x, 100x scale? Did you address failure modes?
Communication
Can the interviewer follow your thinking? Is your explanation clear, structured, and confident?
12 Problems, 12 Opportunities to Improve
Design a URL Shortener
Handle 100K writes/sec with collision resolution and analytics.
Design a Rate Limiter
Distributed rate limiting across microservices using Redis.
Design a Chat System
Real-time messaging with presence, history, and group chats.
Design a Notification Service
Multi-channel (email, SMS, push) with retry logic and deduplication.
Design a Payment Gateway
Idempotent transactions, saga pattern, and fraud detection hooks.
Design a Web Crawler
Distributed crawling at scale with politeness and deduplication.
Design a News Feed
Fan-out-on-write vs read with caching and social graph traversal.
Design a Video Streaming Platform
Adaptive bitrate streaming, CDN strategy, and encoding pipeline.
Design a Distributed Cache
Consistent hashing, eviction policies, and replication.
Design a Search Engine
Inverted index, ranking algorithm, and real-time indexing pipeline.
Design a Booking System
Concurrent seat/room booking with optimistic locking and saga compensation.
Design an Event Sourcing System
Full CQRS + event sourcing with Azure Event Hubs and Cosmos DB.
Unlock All 12 Mock Interviews
All mock interviews are included in every course plan. Start with the free trial and upgrade when you’re ready.
Not sure which plan fits you?
Start with the self-paced plan — you can upgrade any time. Every plan includes lifetime access and a 30-day money-back guarantee.
