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Lessons (15)

• Containers at Scale: ECS Deep Dive and EKS

  … right-size requests, use Spot via Karpenter for tolerant workloads, and use Savings Plans for the stable base …

• Cost Optimization and the Well-Architected Framework

  … ElastiCache, OpenSearch (where Savings Plans do not apply) Spot Up to around 90% None, can be interrupted with …

• Layered (N-Tier) Architecture

  … of code spread over three tiers. The weak spots 1. The database sits at the bottom In a …

• AI Evaluation, Safety, and Security

  … Model-based graders can help triage but may share the model's blind spots; calibrate them against human …

• Domain-Driven Design: Strategic Design

  … Then add commands, actors, policies and hot spots. Sticky note Colour Example --- --- --- Domain event 🟧 Orange Order Placed …

• Design a Chat Application

  … users, reconnect rate, undelivered-message age, duplicate rejections, sequence gaps, push-provider failures and per-conversation hot spots.

• S — Single Responsibility Principle

  … of people who would ask for a change . Spot the hidden responsibilities js // ❌ Three actors, one class class …

• Which Pattern Do I Need?

  A problem-first guide for picking the right design pattern, telling look-alike patterns apart, and spotting when …

• KISS: Keep It Simple, Stupid

  … Learn to spot over-engineering and choose boring, obvious code. The big idea A Rube Goldberg machine uses …

• GitOps, Progressive Delivery and Observability

  … ResourceQuota , LimitRange , RBAC and NetworkPolicies per team. - Use spot or preemptible nodes for fault-tolerant workloads, protected by …

• Small Functions That Do One Thing

  … Learn how to spot a function doing too much and how to split it. The big idea A …

• Choosing a Programming Language

  … binary Learning curve Gentle Gentlest Gentle Steep Sweet spot Full-stack web, APIs, real-time Automation, data, AI …

• Dynamic Programming

  … 3, 1]); // 12 → 2 + 9 + 1 How to spot a DP problem Keywords: "number of ways" , "minimum/maximum …

• EC2, Storage and Auto Scaling

  … unknown usage Savings Plans Predictable long-running usage Spot Interruptible batch or flexible workers Auto Scaling An Auto …

• Collaborative Document Editing & Real-Time Sync

  … concurrency model and defend it, find the hot spots (hot documents, sequencer failover, long offline merges) without being …