Keentune
Adaptive skill practice — find your level, get sharper.

System Design practice

Scale it, distribute it, keep it reliable
The architecture pillar of senior interviews — horizontal scaling and load balancing, caching strategies, database sharding and replication, the CAP theorem and consistency models, message queues and delivery guarantees, and reliability patterns (circuit breakers, rate limiting, idempotency, Bloom filters). Concept-first questions that build the vocabulary and judgment to reason about real distributed systems. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
New here? Read the System Design guide
A free 16-minute primer — the mental model, the mistakes beginners make, and what to practise first.
Curriculum
292 concepts across 31 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.
A. Foundations of distributed design
10
B. Capacity estimation and the math of scale
10
C. Scaling axes and compute topology
9
D. Load balancing and traffic distribution
10
E. CDNs, the edge and network delivery
9
F. Caching and invalidation
10
G. Partitioning and sharding
10
H. Replication
11
I. Consistency models, CAP and PACELC
10
J. Consensus and leader election
10
K. Clocks, time and ordering
9
L. Transactions and sagas across services
10
M. Messaging, queues and delivery semantics
10
N. Event-driven architecture, CQRS and event sourcing
9
O. API design and service boundaries
10
P. Storage engines, indexes and search
10
Q. Rate limiting, load shedding and backpressure
10
R. Timeouts, retries and circuit breakers
10
S. Failure modes and their signatures
10
T. Observability, SLOs and error budgets
10
U. Deployment and safe change
9
V. Multi-region, disaster recovery and data locality
9
W. Data modelling, database selection and indexes
20
X. Service discovery, meshes and the request path
6
Y. Stream and batch processing
8
Z. Design building blocks and the interview method
13
AA. Case studies at scale
7
AB. Security, trust boundaries and compliance
7
AC. Web protocols and delivery basics
7
AD. Advanced coordination and replication
5
AE. Infrastructure and operational practice
4
View the full curriculum →
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