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Web Development

Web Development — Practical guides on web development, Flutter, n8n automation, and digital strategy. Real project insights from a senior-only agency.

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44 articles

·13 min read

Server Actions in Next.js App Router: Production Form Patterns for Validation, Errors, and Optimistic UI

A production-ready guide to Next.js Server Actions form validation with Zod, structured error handling, progressive enhancement, optimistic UI, and rate limiting — plus when to choose Server Actions vs API routes.

Next.jsServer ActionsFormsZodApp RouterSecurityUX
Adrijan OmićevićRead Article →
·15 min read

Next.js + Supabase RLS for Multi‑Tenant SaaS: Policies, Roles, and Safe Data Access

A practical guide to Next.js App Router and Supabase Row Level Security for multi-tenant SaaS: table design, policies, roles, server-side access patterns, common pitfalls, and a deployment checklist.

Next.jsSupabasePostgreSQLRow Level SecurityMulti-tenantSaaSSecurityApp Router
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·13 min read

Dynamic Open Graph Images in Next.js: OG Generation, Caching, Fonts, and Edge Runtime Tips

A practical 2026 guide to Next.js dynamic Open Graph images: per-page OG generation, font loading, cache headers, Edge runtime gotchas, and deployment troubleshooting.

Next.jsSEOOpen GraphPerformanceEdge RuntimeCaching
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·15 min read

Next.js Technical SEO Audit Checklist (App Router): Indexing, Metadata, Core Web Vitals, and Structured Data

A step-by-step Next.js technical SEO audit checklist for the App Router: crawling and indexing controls, metadata and canonicals, sitemaps and robots, pagination, Core Web Vitals, and JSON-LD schema with copy-pasteable code.

Next.jsSEOTechnical SEOApp RouterPerformanceCore Web VitalsStructured Data
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·14 min read

Building a React Design System with Design Tokens: Tailwind CSS + Radix UI + TypeScript

A practical 2026 guide to building a React design system with Tailwind and Radix using design tokens, accessible primitives, theming, and reusable packages across multiple apps.

ReactDesign SystemTailwind CSSRadix UITypeScriptDesign TokensMonorepo
Adrijan OmićevićRead Article →
·15 min read

Next.js + Supabase SaaS Starter Architecture (App Router): Auth, RLS, Billing, and Multi-Tenancy

A production-ready blueprint for a Next.js App Router + Supabase SaaS starter architecture: auth, Postgres data model, RLS policies, Stripe billing, and multi-tenant organization design with concrete examples.

Next.jsSupabaseSaaSApp RouterPostgreSQLRLSStripeMulti-tenancyArchitecture
Adrijan OmićevićRead Article →
·14 min read

Feature Flags & A/B Testing in Next.js: Architecture, Tooling, and Safe Rollouts (2026 Guide)

A practical guide to implementing Next.js feature flags and A/B testing with server and client evaluation, Edge runtime considerations, analytics, and team rollout playbooks.

Next.jsFeature FlagsA/B TestingExperimentationEdgeAnalyticsDevOps
Adrijan OmićevićRead Article →
·14 min read

React Query vs SWR in Next.js App Router: When to Use Which (and How to Avoid Double Fetching)

A practical 2026 comparison of React Query and SWR inside Next.js App Router — caching models, SSR and RSC compatibility, mutations, optimistic updates, DX, and proven patterns to prevent double fetching.

Next.jsReact QuerySWRApp RouterRSCCachingPerformance
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·15 min read

Next.js File Uploads Done Right: Direct-to-S3 and Cloudflare R2 with Presigned URLs, Validation, and Security

A practical 2026 guide to building secure, reliable direct-to-object-storage uploads in Next.js App Router using presigned URLs, server-side validation, retry handling, and optional antivirus scanning.

Next.jsS3Cloudflare R2Presigned URLsSecurityFile UploadsApp Router
Adrijan OmićevićRead Article →
·15 min read

Next.js Background Jobs in 2026: Queues, Cron, and Long-Running Tasks on Vercel (and Beyond)

A practical guide to running background work in Next.js in 2026: Vercel Cron, serverless limits, queues with Upstash and Redis, and worker services for long-running tasks. Includes decision criteria, architecture diagrams, and a production checklist.

Next.jsVercelBackground JobsQueuesCronRedisUpstashArchitectureDevOps
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·14 min read

Next.js i18n with the App Router: Localized Routing, SEO, and Content Workflows (2026 Guide)

Implement Next.js i18n in the App Router with localized routing, language detection, SEO-safe metadata, and scalable translation workflows for JSON, CMS, or localization platforms.

Next.jsi18nSEOApp RouterInternationalizationContentReact
Adrijan OmićevićRead Article →
·13 min read

React Forms at Scale: React Hook Form + Zod Patterns for Complex Products

React forms best practices for large apps using React Hook Form and Zod: schema-first validation, reusable fields, async checks, multi-step flows, performance, accessibility, and server/API integration patterns.

ReactFormsReact Hook FormZodTypeScriptNext.jsAccessibilityPerformance
Adrijan OmićevićRead Article →