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Lessons (15)

• Cost Optimization and the Well-Architected Framework

  … for unexpected spikes Cost allocation tags Attribute cost to teams, products and environments Compute Optimizer Right-sizing recommendations …

• Big Data: ETL, Warehouses and Streaming

  … Create curated datasets with event-time handling and deduplication, then load warehouse models optimized for reporting. 3. Use …

• Code Profiling

  … optimisation is only useful when it improves a user-facing outcome: a faster request, smoother interaction, lower cost …

• Database Indexing & Transactions

  … reads every row Seq Scan on users (cost=0.00..18334.00 rows=1) (actual time=0.03 …

• 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 …

• Machine Learning Fundamentals

  … Repeatedly tuning against the test set leaks information and makes its score too optimistic. text all labeled examples …

• KISS: Keep It Simple, Stupid

  … 10 }; const DEFAULT SHIPPING COST = 20; const getShippingCost = (country) = SHIPPING COST[country] ?? DEFAULT SHIPPING COST; KISS in architecture …

• Scalable Frontend Architecture

  … introduce shared-runtime, routing, visual-consistency and observability costs. They are not a cure for a poorly separated …

• What to Learn in AI, and in What Order

  … 6. Reliable delivery: Evaluate quality, protect data, address abuse and prompt injection, manage latency and cost, and monitor …

• L6 Production Debugging Casebook

  … An added index makes a query slower An index changes the optimizer's choices; it does not guarantee …

• Rust: Ownership, Borrowing and Lifetimes

  … safe but with runtime cost). Rust has a third way: the compiler proves at compile time when memory …

• Caching & Redis

  … A lock is an optimization, not a reason to make the database unavailable. 4. Caching errors and empty …

• Collaborative Document Editing & Real-Time Sync

  … The client applies the edit optimistically to local state, so typing has zero latency. 2. It sends {clientId …

• Backend Design Scenarios

  … Shard when the primary cannot handle the write rate, storage, I/O or connection count even after optimization …