Web Fundamentals

Build & Deployment: Monorepo, CI/CD, Strategies & Release Safety

Web Fundamentals Map

Rendering & Browser Architecture

Critical Rendering PathScript Loading Patterns (async/defer)Event Loop Deep DiveJavaScript Module Systems (CJS, ESM, UMD)Dynamic Module Loading (import())Import on InteractionImport on VisibilityBrowser Rendering Pipeline & Layout ThrashingRendering Strategies (CSR, SSR, SSG, ISR)Streaming SSR & Progressive HTMLIslands ArchitectureReact Server ComponentsFramework Reactivity (React, Vue, Svelte, Solid)HTTP/1.1 vs HTTP/2 vs HTTP/3 (QUIC)DNS Resolution & TTL Caching

Performance

Core Web Vitals: LCP, INP, CLSPerformance Optimization Trade-offsCritical Resource PrioritizationCode Splitting & Dynamic ImportsTree Shaking & Dead Code EliminationLazy LoadingResource Hints: Preload, Prefetch & PreconnectText Compression: Gzip & BrotliImage & Video OptimizationAdaptive LoadingList VirtualizationWeb Workers vs Main ThreadMemory Leaks: Detection & PreventionManaging Third-Party ScriptsHow CDNs WorkHTTP Caching Deep DiveService Workers & Offline StrategyPWA Fundamentals

Security

Cross-Site Scripting (XSS)Cross-Site Request Forgery (CSRF)CORS ExplainedCORS Preflight, Credentials & MisconfigurationsContent Security Policy (CSP)Why is HTTPS Secure? (TLS/SSL)Authorization Best PracticesCookie Security & Session Hardening

State & Data Architecture

State Management Guide (Context vs Zustand vs Redux)React Query & Server State CachingData Fetching PatternsCaching StrategiesPagination: Offset vs Cursor-BasedReal-time Communication (WebSocket, SSE, Polling)
mediumWeb Fundamentals

Build & Deployment: Monorepo, CI/CD, Strategies & Release Safety

Learn the interview-ready mental model, practical trade-offs, and production patterns for this web fundamentals topic.

Topic content

TL;DRDelivery quality = speed + safety. Build once, verify rigorously, release progressively, monitor closely, and always design for fast rollback.
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Frontend build and deployment is not just DevOps — it directly shapes developer velocity, release confidence, cache correctness, and user safety. Key decisions include monorepo vs multi-repo, CI/CD strategy, deployment patterns (rolling, blue-green, canary), feature flags, and observability-driven rollback plans.

Code enters the line (build), passes multiple quality gates (CI checks, tests, previews), gets packaged as an immutable artifact, and is released progressively (canary/blue-green). Feature flags are emergency stop buttons, and rollback is the reverse conveyor belt. The goal is fast, safe, and repeatable delivery.

Code Change
Build (deterministic artifact)
CI Gates (tests, lint, typecheck)
Preview Environments
Progressive Rollout (canary/flag)
Monitor + Rollback if needed

1Monorepo vs Multi-Repo

Monorepo enables atomic changes, shared libraries, and consistent tooling but requires strong affected-only builds and package boundaries. Multi-repo gives clear ownership and independence but leads to version drift and duplicated effort. Choose based on team topology and shared code needs.

2CI/CD Strategies

Trunk-Based Development enables fast feedback and continuous deployment. GitFlow provides explicit release branches but slows velocity. Strong pipelines include fast PR checks, selective execution, preview environments, and immutable artifacts.

3Deployment Strategies

Rolling: gradual replacement. Blue-Green: instant cutover with fast rollback. Canary: real-user validation with limited blast radius. All require strong observability and rollback plans.

4Feature Flags & Release Safety

Flags decouple deploy from release. Use for gradual rollout, kill switches, and experimentation. Maintain flag hygiene: owners, cleanup dates, and explicit testing of all states.

Key Takeaways
  • ✓Delivery quality = speed + safety
  • ✓Monorepo for shared velocity, multi-repo for isolation
  • ✓Trunk-based development + preview environments = fast feedback
  • ✓Build once, promote the same immutable artifact
  • ✓Progressive rollout (canary/blue-green + feature flags) reduces risk
  • ✓Always design for fast rollback and observability
  • ✓Clean up feature flags and dead code regularly
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