Level 4 of 5

Summit

The problems that trip up senior engineers. You're not just using databases and queues anymore — you're building them, or explaining exactly how they work under the hood.

SUMMIT

Key-Value Store

Design a distributed KV store — leaderless replication, quorum reads/writes, LSM tree internals, gossip membership, vector clock conflict resolution.

LSM Trees Compaction Quorum W/R Gossip Protocol Hinted Handoff Vector Clocks

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SUMMIT

Netflix

Design a global video streaming platform — transcoding pipeline, adaptive bitrate, CDN at scale, Elasticsearch search, resume playback sync, and fault isolation.

Transcoding HLS / DASH CDN Elasticsearch Circuit Breaker Adaptive Bitrate

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