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Lessons (26)

• Design a Ride-Sharing Service

  … Watch stale-location age, match latency, conflicts and regional imbalance.

• Indexes, EXPLAIN & Query Plans

  … most rows still match. - Wrapping an indexed column in a function without a matching expression index. - Forgetting the …

• Services & Ingress

  … podSelector: { matchLabels: { app: payments-db } } policyTypes: [Ingress] ingress: - from: - podSelector: { matchLabels: { app: payments-api } } ports: [{ port: 5432 }] Debugging …

• Creational Patterns: How to Make Objects

  … Abstract Factory 🛋️ Analogy: A furniture store sells matching collections : a Modern chair + Modern sofa + Modern table, or …

• Why Kubernetes?

  … scheduling, self-healing, scaling, rollouts and discovery. - You declare desired state in YAML; control loops keep reality matching …

• Stacks & Queues

  … undo, call stack, bracket matching, DFS, monotonic-stack problems. - Queues: task scheduling, message brokers, the event loop, BFS.

• Replication, Partitioning & Sharding

  … Choose a partition key that matches retention and common filters. Too many tiny partitions add planning and operational …

• N+1 Queries, Loading & Pagination

  … DESC LIMIT 50 Support it with an index matching the filter and sort, such as orders(customer id …

• Deployments, ReplicaSets & Rollouts

  … This loose matching is how Deployments find their pods and Services find their endpoints. mermaid flowchart LR D …

• Message Queues & RabbitMQ

  … type Routing rule Example --- --- --- Direct Exact routing key match "pdf" → pdf-queue Topic Wildcards: = one word, = zero or …

• ACID, Transactions & Locks

  … transaction Repeatable read or explicit lock Phantom New matching row appears in a range Serializable isolation/predicate protection …

• Scaling & Health Probes

  … ScheduleAnyway labelSelector: { matchLabels: { app: shop-api } } Key takeaways - Liveness restarts stuck containers; readiness removes pods from traffic; startup …

• Helm, kubectl Cheat Sheet & Best Practices

  … make the cluster match git" K8s[☸️ Cluster] Argo -.- drift detected → auto-fix K8s ✅ Every change is reviewed and …

• Choosing an Architecture

  … Compare every style in this course on one page, match them to your team, domain and scale, see …

• Dynamic Programming

  … 1] ? dp[i - 1][j - 1] + 1 // chars match: extend the diagonal : Math.max(dp[i - 1][j …

• What Are Design Patterns?

  … repeated pain C[Pick the matching pattern] C -- D[Refactor toward it] D -- A Patterns in modern JavaScript …

• Which Pattern Do I Need?

  … too<br/ many parameters"] -- B[Builder] P3["Need matching families<br/ (themes, providers)"] -- AF[Abstract Factory] P4["3rd …

• Meaningful Names

  … Length should match scope mermaid flowchart LR S["Tiny scope<br/ (3-line loop)"] -- short name ok s1 …

• Kubernetes Cluster Architecture

  … can't fit it<br/ or don't match rules"] F -- S["2️⃣ Score<br/ rank the rest …

• React Fundamentals

  … DOM node, update only the changed attributes. - Lists → match children by key . Handling forms jsx function SignupForm({ onSubmit …

• Binary Search

  … When you find a match, don't stop: record it and keep searching left . js function firstIndexOf(sorted …

• DSA Interview Patterns Cheat Sheet

  … yes HM[Hash map / Set] G -- no ST{Matching pairs, next greater,<br/ undo, nesting?} ST -- yes STK …

• Microkernel (Plugin) Architecture

  … vite.config.ts → plugins: [react()] Convention Load everything matching a naming pattern or folder eslint-plugin- , a plugins …

• Database Indexing & Transactions

  … row; with one it jumps straight to the match](/img/backend/index-scan.svg) No index (full table …

• Frontend Performance & Core Web Vitals

  … swap with a well-matched fallback font (Next.js next/font does this). - Don't insert content above …

• Structural Patterns: How to Connect Objects

  … to use a class whose interface doesn't match what your code expects (typically a 3rd-party library …