System Design
Learn to design scalable systems.
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- System DesignDifficulty: Medium
System Design Fundamentals
Build confidence in System Design Fundamentals with this 34-question interview-focused practice test, designed for system-design interviews. The attempt uses a 25-minute timer so you can practise with clear conditions.
🎯 Coverage: The questions cover scalability and traffic growth; database replication and sharding; consistency and availability trade-offs; caching and hot-key protection; asynchronous processing and queues; and observability and operational signals. Questions connect definitions with implementation choices, failure cases, trade-offs, and the concise reasoning expected in technical discussions.
Use the result to find weak concepts, rehearse concise explanations, and revisit the trade-offs you would need to defend in an interview or production discussion.34 questions25 minStart test - System DesignDifficulty: Hard
Sharding, Replication, and Hot Partitions
Use Sharding, Replication, and Hot Partitions as a 20-question checkpoint for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
🎯 Coverage: The questions cover database replication and sharding; observability and operational signals; encryption, hashing, and secure transport; and trees, graphs, and traversals. Expect a mixture of recall, calculation, and interpretation that rewards careful reading as much as speed.
Convert the result into an interview checklist covering definitions, edge cases, operational risks, and defensible trade-offs; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Object Storage, Search, and Analytical Stores
Use Object Storage, Search, and Analytical Stores as a 20-question checkpoint for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
📚 Inside the quiz: The questions cover scalability and traffic growth; consistency and availability trade-offs; and indexes and query optimization. The set moves from core concepts to practical choices about prompting, verification, escalation, and responsible use.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Replication, Quorums, and Consensus
Build confidence in Replication, Quorums, and Consensus with this 20-question interview-focused practice test, designed for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
🧠 What you will practise: The questions cover database replication and sharding. Questions move between quick wins and multi-step reasoning so you can practise choosing an efficient solving path.
Convert the result into an interview checklist covering definitions, edge cases, operational risks, and defensible trade-offs; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Medium
Failover, Disaster Recovery, and Backups
Prepare more deliberately for system-design interviews with Failover, Disaster Recovery, and Backups. This 20-question interview-focused practice test turns the topic into a structured practice session. The attempt uses a 30-minute timer so you can practise with clear conditions.
📚 Inside the quiz: The questions cover encryption, hashing, and secure transport; privacy-sensitive data handling; and DNS, DHCP, and network discovery. The questions emphasise diagnosis and decision-making: what to choose, what can fail, and what evidence supports the trade-off.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Consistency, Latency, and Availability Trade-offs
Move beyond surface-level recall with Consistency, Latency, and Availability Trade-offs in this 20-question interview-focused practice test. It is structured for system-design interviews, and the attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
⚙️ Skills tested: The questions cover consistency and availability trade-offs. The questions emphasise diagnosis and decision-making: what to choose, what can fail, and what evidence supports the trade-off.
After the attempt, write down the decisions you could not justify clearly and revisit the underlying constraints before retrying; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Payments, Ticketing, and Consistency
Build confidence in Payments, Ticketing, and Consistency with this 20-question interview-focused practice test, designed for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
🧠 What you will practise: The questions cover state-machine modelling; caching and hot-key protection; observability and operational signals; and bias, fairness, and responsible evaluation. Rather than rewarding definitions alone, the set tests how concepts behave under constraints, failures, and changing requirements.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Medium
System Design Interview Mock: SDE-2 Round 1
Move beyond surface-level recall with System Design Interview Mock: SDE-2 Round 1 in this 30-question interview-focused practice test. It is structured for system-design interviews, and the attempt uses a 45-minute timer so you can practise with clear conditions.
📚 Inside the quiz: The questions cover asynchronous processing and queues; consistency and availability trade-offs; linked lists, stacks, and queues; caching and hot-key protection; observability and operational signals; and scalability and traffic growth. The progression moves from core terminology to debugging, boundary decisions, and trade-offs that surface in real interviews.
Review missed scenarios by asking what assumption failed, which alternative fits better, and how you would explain that choice aloud; the answer explanations provide a focused review path.30 questions45 minStart test - System DesignDifficulty: Medium
System Design Foundations: Applied Architecture
Build confidence in System Design Foundations: Applied Architecture with this 18-question interview-focused practice test, designed for system-design interviews. The attempt uses a 25-minute timer so you can practise with clear conditions.
⚙️ Skills tested: The questions cover requirements, constraints, and capacity estimates; API contracts and endpoint design; caching and hot-key protection; scalability and traffic growth; and microservice boundaries. The progression moves from core terminology to debugging, boundary decisions, and trade-offs that surface in real interviews.
Review missed scenarios by asking what assumption failed, which alternative fits better, and how you would explain that choice aloud; the answer explanations provide a focused review path.18 questions25 minStart test - System DesignDifficulty: Hard
High-Traffic System Scaling
Prepare more deliberately for system-design interviews with High-Traffic System Scaling. This 20-question interview-focused practice test turns the topic into a structured practice session. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
🧠 What you will practise: The questions cover asynchronous processing and queues; linked lists, stacks, and queues; scalability and traffic growth; observability and operational signals; concurrency, threads, and synchronization; and Java streams and functional operations. Rather than rewarding definitions alone, the set tests how concepts behave under constraints, failures, and changing requirements.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Medium
SQL, NoSQL, and Data Modeling Decisions
Use SQL, NoSQL, and Data Modeling Decisions as a 20-question checkpoint for system-design interviews. The attempt uses a 30-minute timer so you can practise with clear conditions.
🧠 What you will practise: The questions cover data modelling and storage choices; database normalization and schema design; scalability and traffic growth; and trees, graphs, and traversals. Use the scenarios to practise separating a plausible shortcut from an approach that remains maintainable at production scale.
Treat incorrect answers as design-review notes: identify the overlooked constraint and practise defending a safer alternative; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Leader Election, Clocks, and Coordination
Move beyond surface-level recall with Leader Election, Clocks, and Coordination in this 20-question interview-focused practice test. It is structured for system-design interviews, and the attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
⚙️ Skills tested: The questions cover Leader Election, Clocks, and Coordination. Rather than rewarding definitions alone, the set tests how concepts behave under constraints, failures, and changing requirements.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Graceful Degradation and Load Shedding
Prepare more deliberately for system-design interviews with Graceful Degradation and Load Shedding. This 20-question interview-focused practice test turns the topic into a structured practice session. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
🎯 Coverage: The questions cover failure handling and graceful degradation; asynchronous processing and queues; linked lists, stacks, and queues; and authentication and authorization. The progression moves from core terminology to debugging, boundary decisions, and trade-offs that surface in real interviews.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Cost, Complexity, and Operational Trade-offs
Use Cost, Complexity, and Operational Trade-offs as a 20-question checkpoint for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
📚 Inside the quiz: The questions cover asynchronous processing and queues; observability and operational signals; and linked lists, stacks, and queues. Use the scenarios to practise separating a plausible shortcut from an approach that remains maintainable at production scale.
After the attempt, write down the decisions you could not justify clearly and revisit the underlying constraints before retrying; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Medium
URL Shortener and Rate Limiter Design
Prepare more deliberately for system-design interviews with URL Shortener and Rate Limiter Design. This 20-question interview-focused practice test turns the topic into a structured practice session. The attempt uses a 30-minute timer so you can practise with clear conditions.
📚 Inside the quiz: The questions cover rate limiting and abuse protection; URL shortening and code generation; data modelling and storage choices; and caching and hot-key protection. The questions emphasise diagnosis and decision-making: what to choose, what can fail, and what evidence supports the trade-off.
Convert the result into an interview checklist covering definitions, edge cases, operational risks, and defensible trade-offs; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
System Design Interview Mock: Senior Engineer Round 2
Prepare more deliberately for system-design interviews with System Design Interview Mock: Senior Engineer Round 2. This 30-question interview-focused practice test turns the topic into a structured practice session. The attempt uses a 45-minute timer and hard difficulty so you can practise with clear conditions.
⚙️ Skills tested: The questions cover caching and hot-key protection; observability and operational signals; authentication and authorization; transactions and ACID guarantees; and cell biology, genetics, and evolution. Use the scenarios to practise separating a plausible shortcut from an approach that remains maintainable at production scale.
Review missed scenarios by asking what assumption failed, which alternative fits better, and how you would explain that choice aloud; the answer explanations provide a focused review path.30 questions45 minStart test - System DesignDifficulty: Medium
Requirements, APIs, and Architecture Trade-offs
Use Requirements, APIs, and Architecture Trade-offs as a 18-question checkpoint for system-design interviews. The attempt uses a 25-minute timer so you can practise with clear conditions.
🧠 What you will practise: The questions cover API contracts and endpoint design; data modelling and storage choices; and requirements, constraints, and capacity estimates. Use the scenarios to practise separating a plausible shortcut from an approach that remains maintainable at production scale.
Use the result to find weak concepts, rehearse concise explanations, and revisit the trade-offs you would need to defend in an interview or production discussion; the answer explanations provide a focused review path.18 questions25 minStart test - System DesignDifficulty: Medium
Scalability Patterns and Bottlenecks
Build confidence in Scalability Patterns and Bottlenecks with this 20-question interview-focused practice test, designed for system-design interviews. The attempt uses a 30-minute timer so you can practise with clear conditions.
🎯 Coverage: The questions cover scalability and traffic growth; caching and hot-key protection; asynchronous processing and queues; observability and operational signals; and linked lists, stacks, and queues. Use the scenarios to practise separating a plausible shortcut from an approach that remains maintainable at production scale.
Use the result to find weak concepts, rehearse concise explanations, and revisit the trade-offs you would need to defend in an interview or production discussion; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Medium
Indexes, Query Patterns, and Storage Performance
Build confidence in Indexes, Query Patterns, and Storage Performance with this 20-question interview-focused practice test, designed for system-design interviews. The attempt uses a 30-minute timer so you can practise with clear conditions.
📚 Inside the quiz: The questions cover indexes and query optimization. The set moves from core concepts to practical choices about prompting, verification, escalation, and responsible use.
Use the result to find weak concepts, rehearse concise explanations, and revisit the trade-offs you would need to defend in an interview or production discussion; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Partition Tolerance and Conflict Resolution
Prepare more deliberately for system-design interviews with Partition Tolerance and Conflict Resolution. This 20-question interview-focused practice test turns the topic into a structured practice session. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
⚙️ Skills tested: The questions cover transactions and ACID guarantees. The progression moves from core terminology to debugging, boundary decisions, and trade-offs that surface in real interviews.
After the attempt, write down the decisions you could not justify clearly and revisit the underlying constraints before retrying; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
SLOs, Error Budgets, and Incident Readiness
Move beyond surface-level recall with SLOs, Error Budgets, and Incident Readiness in this 20-question interview-focused practice test. It is structured for system-design interviews, and the attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
🎯 Coverage: The questions cover observability and operational signals. Scenario prompts ask you to choose an approach, recognise its limits, and explain the production consequences clearly.
Use the result to find weak concepts, rehearse concise explanations, and revisit the trade-offs you would need to defend in an interview or production discussion; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Medium
Monolith, Microservices, and Modular Boundaries
Use Monolith, Microservices, and Modular Boundaries as a 20-question checkpoint for system-design interviews. The attempt uses a 30-minute timer so you can practise with clear conditions.
🧠 What you will practise: The questions cover microservice boundaries; and observability and operational signals. The progression moves from core terminology to debugging, boundary decisions, and trade-offs that surface in real interviews.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
News Feed and Notification Systems
Use News Feed and Notification Systems as a 20-question checkpoint for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
🧠 What you will practise: The questions cover caching and hot-key protection; observability and operational signals; and consistency and availability trade-offs. The set balances direct recall with calculations, interpretation, and the accuracy needed to work efficiently under exam conditions.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
System Design Interview Mock: Staff-Level Trade-offs Round 3
Use System Design Interview Mock: Staff-Level Trade-offs Round 3 as a 30-question checkpoint for system-design interviews. The attempt uses a 45-minute timer and hard difficulty so you can practise with clear conditions.
🎯 Coverage: The questions cover failure handling and graceful degradation; and encryption, hashing, and secure transport. Scenario prompts ask you to choose an approach, recognise its limits, and explain the production consequences clearly.
After the attempt, write down the decisions you could not justify clearly and revisit the underlying constraints before retrying; the answer explanations provide a focused review path.30 questions45 minStart test - System DesignDifficulty: Medium
Core System Design Decisions
Use Core System Design Decisions as a 18-question checkpoint for system-design interviews. The attempt uses a 25-minute timer so you can practise with clear conditions.
🎯 Coverage: The questions cover caching and hot-key protection; and transactions and ACID guarantees. The questions emphasise diagnosis and decision-making: what to choose, what can fail, and what evidence supports the trade-off.
Use weaker areas as prompts for deeper revision, then retry when you can connect each concept to a concrete implementation consequence; the answer explanations provide a focused review path.18 questions25 minStart test - System DesignDifficulty: Medium
Caching, Queues, and Read Scaling
Prepare more deliberately for system-design interviews with Caching, Queues, and Read Scaling. This 20-question interview-focused practice test turns the topic into a structured practice session. The attempt uses a 30-minute timer so you can practise with clear conditions.
⚙️ Skills tested: The questions cover caching and hot-key protection; asynchronous processing and queues; linked lists, stacks, and queues; and scalability and traffic growth. Use the scenarios to practise separating a plausible shortcut from an approach that remains maintainable at production scale.
Review missed scenarios by asking what assumption failed, which alternative fits better, and how you would explain that choice aloud; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Transactions, Isolation, and Consistency
Build confidence in Transactions, Isolation, and Consistency with this 20-question interview-focused practice test, designed for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
📚 Inside the quiz: The questions cover transactions and ACID guarantees; deadlocks and process scheduling; encapsulation and invariants; consistency and availability trade-offs; and concurrency, threads, and synchronization. The questions emphasise diagnosis and decision-making: what to choose, what can fail, and what evidence supports the trade-off.
After the attempt, write down the decisions you could not justify clearly and revisit the underlying constraints before retrying; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Distributed Transactions, Sagas, and Idempotency
Build confidence in Distributed Transactions, Sagas, and Idempotency with this 20-question interview-focused practice test, designed for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
🎯 Coverage: The questions cover transactions and ACID guarantees; asynchronous processing and queues; microservice boundaries; and linked lists, stacks, and queues. The progression moves from core terminology to debugging, boundary decisions, and trade-offs that surface in real interviews.
Treat incorrect answers as design-review notes: identify the overlooked constraint and practise defending a safer alternative; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Medium
Timeouts, Retries, and Circuit Breakers
Use Timeouts, Retries, and Circuit Breakers as a 20-question checkpoint for system-design interviews. The attempt uses a 30-minute timer so you can practise with clear conditions.
📚 Inside the quiz: The questions cover observability and operational signals; failure handling and graceful degradation; and authentication and authorization. The progression moves from core terminology to debugging, boundary decisions, and trade-offs that surface in real interviews.
After the attempt, write down the decisions you could not justify clearly and revisit the underlying constraints before retrying; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Medium
Sync vs Async Architecture Decisions
Build confidence in Sync vs Async Architecture Decisions with this 20-question interview-focused practice test, designed for system-design interviews. The attempt uses a 30-minute timer so you can practise with clear conditions.
🧠 What you will practise: The questions cover asynchronous processing and queues; and linked lists, stacks, and queues. Scenario prompts ask you to choose an approach, recognise its limits, and explain the production consequences clearly.
After the attempt, write down the decisions you could not justify clearly and revisit the underlying constraints before retrying; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
Chat, Video, and Real-Time Systems
Use Chat, Video, and Real-Time Systems as a 20-question checkpoint for system-design interviews. The attempt uses a 30-minute timer and hard difficulty so you can practise with clear conditions.
⚙️ Skills tested: The questions cover observability and operational signals; scalability and traffic growth; consistency and availability trade-offs; and WebSockets and real-time delivery. Scenario prompts ask you to choose an approach, recognise its limits, and explain the production consequences clearly.
Use the result to find weak concepts, rehearse concise explanations, and revisit the trade-offs you would need to defend in an interview or production discussion; the answer explanations provide a focused review path.20 questions30 minStart test - System DesignDifficulty: Hard
System Design Fundamentals Applied
Move beyond surface-level recall with System Design Fundamentals Applied in this 18-question interview-focused practice test. It is structured for system-design interviews, and the attempt uses a 25-minute timer and hard difficulty so you can practise with clear conditions.
🎯 Coverage: The questions cover encapsulation and invariants; caching and hot-key protection; asynchronous processing and queues; consistency and availability trade-offs; linked lists, stacks, and queues; and joins, subqueries, and window functions. Rather than rewarding definitions alone, the set tests how concepts behave under constraints, failures, and changing requirements.
Use the result to find weak concepts, rehearse concise explanations, and revisit the trade-offs you would need to defend in an interview or production discussion; the answer explanations provide a focused review path.18 questions25 minStart test
Explore System Design
Continue with System Design topics like scaling, distributed systems, load balancing, architecture across courses, notes, and mock tests.