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Ship Production AI in 3-7 Weeks | Harbor Software

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Server Components vs Client Components: A Practical Guide

The Mental Model Shift That Changes Everything When React Server Components landed in production via Next.js 13, our team at Harbor Software had already been building complex dashboards and AI-powered tools for clients. We thought we understood React. We were wrong about where the boundary

Stripe Integration Patterns for Subscription SaaS

Why Stripe Integration Is Harder Than It Looks Every SaaS founder hits the same wall. You sign up for Stripe, drop in Checkout, and think billing is solved. Three months later you’re debugging webhook race conditions at 2 AM while a customer’s subscription is stuck

Optimistic UI Updates: Making Your App Feel Instant

Why Perceived Speed Matters More Than Actual Speed There’s a number that changed how we think about UI at Harbor Software: 100 milliseconds. That’s the threshold below which a user perceives an action as instantaneous. Above it, they start noticing. Above 300ms, they start feeling

State Management in 2023: What Actually Works

The State Management Landscape Has Changed Five years ago, the answer to “how should I manage state in React?” was simple: Redux. It was the default. You installed it on day one, wrote your reducers, connected your components, and accepted the boilerplate as the cost

Building Multi-Tenant SaaS Applications with PostgreSQL Row-Level Security

Why Multi-Tenancy Is an Architecture Decision, Not a Feature Multi-tenancy sounds simple: multiple customers share one application. In practice, it’s one of the most consequential architecture decisions you’ll make for a SaaS product. Get it right, and you scale efficiently with strong isolation guarantees. Get

Next.js App Router: A Migration Guide from Pages Router

Why the Migration Is Worth the Pain Let’s be direct: migrating from the Next.js Pages Router to the App Router is not a weekend project. When we migrated our internal project management tool at Harbor Software — 47 routes, authenticated layouts, server-side data fetching, and

Zero-Trust Security Architecture for SaaS Products

The traditional security model is a castle: hard perimeter, soft interior. Firewalls and VPNs guard the boundary, and once you are inside, you are trusted to access anything. This model was already fragile before the cloud; now it is indefensible. When your application runs across

Monitoring and Alerting for AI-Powered Applications

Traditional monitoring assumes deterministic systems. You send the same input, you get the same output, and any deviation is a bug worth investigating. AI-powered applications break this assumption completely. A language model might return different text for the same prompt on consecutive calls. A recommendation

Implementing Role-Based Access Control from Scratch

Access control is one of those features that seems simple in the elevator pitch and complex in the implementation. “Users have roles, roles have permissions, check the permission before doing the thing.” That covers about 20% of the real design. The remaining 80% involves permission
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