Senior Backend Interview in 2026.
How many of these can you explain without Googling?
- Event Sourcing
- CQRS
- Saga Pattern
- Outbox Pattern
- Idempotency Keys
- Consistent Hashing
- Distributed Locks
- Backpressure
- Write-Ahead Logging (WAL)
- Read-Your-Writes Consistency
- Quorum Reads & Writes
- Vector Clocks
- Gossip Protocol
- Bloom Filters
- Tombstone Records
- Token Bucket vs Leaky Bucket
- Circuit Breakers
- Bulkhead Isolation
- Cache Invalidation
- Leader Election
- Split Brain Problem
- Exactly-Once vs At-Least-Once Delivery
- Change Data Capture (CDC)
- Two-Phase Commit (2PC)
- Raft vs Paxos
If you know more than 10, you are ready for system design interview.