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Lessons (8)

• Frontend Performance & Core Web Vitals

  … Understand LCP, INP and CLS, then apply the proven fixes, from image optimisation and code splitting to caching …

• Big Data: ETL, Warehouses and Streaming

  … A data lake holds raw/flexible data; a warehouse optimizes governed analytical queries; a lakehouse combines lake storage …

• DSA Interview Patterns Cheat Sheet

  … 4. Optimise: "The bottleneck is the inner search… a hash map makes that O(1)." Name the pattern …

• CQRS & Event Sourcing

  … CQRS The big idea A restaurant kitchen and its menu board are optimised for different jobs. The kitchen …

• Database Indexing & Transactions

  … version numbers (optimistic locking) No locks. Each row has a version ; an update only succeeds if nobody changed …

• KISS: Keep It Simple, Stupid

  … harder to read than five clear lines. - Premature optimisation. Making code "fast" before measuring usually just makes it …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … Typical latency Very low for individual messages Low, optimised for throughput Operational weight Lighter Heavier (but managed services …

• Dynamic Programming

  … 2. Optimal substructure: the best answer can be built from the best answers to smaller questions. Two ways …