Crack senior backend interviews

Adaptive learning with FSRS spaced repetition, AI grading, and ADHD-friendly flow detection.

9 domains. Expert depth.

From Java fundamentals to distributed systems, cover everything senior architects need.

Collections, concurrency, JVM, GC, Spring, generics.

Mapping, query DSL, aggregations, cluster management.

Data modeling, aggregation pipeline, replication, sharding.

Query optimization, MVCC, transactions, partitioning.

DDD, CQRS, Event Sourcing, Clean Architecture, Sagas.

GoF 23 patterns, SOLID, architectural patterns, anti-patterns.

Encapsulation, polymorphism, composition, generics.

Redis, cache patterns, clustering, CDN, invalidation.

Kafka, RabbitMQ, Event Sourcing, Sagas, Outbox pattern.

The platform tracks your performance and auto-escalates when you're in flow, or steps back when you need consolidation.

Missed concepts resurface at the optimal interval — days, not never. ADHD-friendly interleaving keeps old material fresh.

Open-ended answers graded by LLM with structured rubrics. Get specific feedback, not just right/wrong.