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The most common errors when building apps with Claude
Seven mistakes we see repeatedly in production Claude apps. Some cost you tokens, some cost you money, one or two can cost you the company. Each one has a simple fix.
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Field notes on AI-native products, design systems, web engineering, SaaS economics and modern infrastructure. New articles every week, sources included.
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Product Design
Dark mode is not a toggle: context-aware theming in 2026
Dark mode adoption hit 82% on mobile in 2025, but a header toggle still ignores ambient light, time of day, and task. Here is the fix.
AI and Automation
Multi-agent system design patterns that survive production
Multi-agent systems cost 15 times more than chat. 40% of pilots fail in 6 months. Five design patterns decide if your AI agent team ships or stalls.
Infrastructure and SEO
Supabase RLS at scale: 7 patterns for queries that stay fast
RLS slows queries 2x to 11x on large tables when policies skip the SELECT wrapper, miss indexes, or hide joins. Here are 7 patterns that fix it.
Business and Scale
Post-launch rot: why your site falls apart 6 months after handover
Production sites decay after handover. Dependencies drift, certificates expire, Web Vitals slide. Why six months is the breakpoint, and how to prevent it.
Web Design and Engineering
Edge runtime vs Node runtime: when each one wins for SaaS
Edge wins on cold start and global latency. Node wins on libraries, duration, and database work. The decision is not binary, and most production SaaS use both.
Product Design
Accessibility-first design after the EU Accessibility Act
The EAA became enforceable on 28 June 2025. Here is what changes for product teams shipping to the EU and what accessibility-first design actually means.
AI and Automation
Claude Code hooks: PreToolUse, PostToolUse, and patterns that scale
How to wire Claude Code hooks for security gates, format-on-save, and team-wide guardrails without slowing the agent down.
Infrastructure and SEO
Cloudflare blocks AI crawlers by default: how to fix it without breaking security
Since 1 July 2025, every new Cloudflare domain blocks GPTBot, ClaudeBot, PerplexityBot and friends. Here is how to selectively allow the ones that cite you.
Business and Scale
Multi-tenant from day one: why single-tenant SaaS is a 5-year mistake
Single-tenant feels safer at launch, then becomes a 6 to 12 month re-architecture between customer 200 and 500. Pool by default, silo as a paid tier.
Web Design and Engineering
Why we removed Tailwind from production: a CSS-only design system
After years of running Tailwind alongside our own design system, we removed it from production. Here is the architecture that replaced it and what changed.
Product Design
Calm UI in 2026: the shift away from animation theatrics
Calm UI keeps interface motion in the user's periphery, animates only when state changes carry meaning, and treats animation as a cost not a default.
AI and Automation
AI-native vs AI bolted-on: how to tell in 60 seconds
What separates AI-native products from retrofits: the architecture, the data flow, the team shape. Plus a 60-second test you can run on any product.
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