Architecting Bulletproof SaaS Billing with Stripe: Webhooks, Proration, and Usage Metrics
Architecting Bulletproof SaaS Billing with Stripe Building a SaaS product is a marathon, but billing is where developers often trip over their own sho…
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How to pick object storage for browser direct uploads with presigned URLs in Node.js
If you just want the recommendation: have your Node.js API mint a short-lived presigned URL, let the browser send the file straight into a private buc…
AI Consent Ledger: Stop Voice Agents From Ignoring Revoked Permission
A voice agent can sound polished, respond instantly, and still create a trust incident in one sentence: “Stop calling me.” If that request only update…
I Built Software for Families Who Share a Holiday Home (So WhatsApp Stops Running the Place)
Sharing a holiday home with family or friends is great until the admin starts. Who’s in next weekend? Did someone already claim Easter? Who was meant …
I Built Full Team Management Into My Agency SaaS. Here's the Complete Feature Spec.
I've been building Melororium ( https://melororium.com ) — a flat-fee workspace for agencies — for about eight months. The Team section turned out to …
Stop Building Your SaaS Like a Giant Enterprise App
I spent three months building a multi-tenant architecture for a project that ended up having four users. I used a microservices approach, a distribute…
Picking a text-to-image API for a SaaS app: REST, pricing, and safety
If you just want the recommendation: call a plain REST image generation endpoint from your Node.js backend, keep the prompt-in / image-out path as dum…
How to Monitor a YouTube Playlist Without Scraping the Page
A YouTube playlist can look healthy today and silently lose useful context later. A video becomes private, an upload is deleted, a viewer restriction …
JWT vs Session Tokens | What’s the Difference and Which Should You Use?
JWT vs Session Tokens : The One Sentence That Actually Matters If you've built more than one web app, you've had this argument with a teammate: "just …
AI Analytics Row-Level Security: Let Users Ask Questions Without Leaking Data
The dangerous part of AI analytics is not that a model may write a bad chart title. It is that one friendly question can turn into a warehouse query y…
How to Scale a Developer SaaS from 0 to 1 Lessons from Building PromptDev
Building a SaaS product is easy in 2026—technologies like Next.js, Vercel, and AI tools allow developers to launch products in days. However, scaling …
Subscription Goldmine: SaaS Models and Startup Cash Flow
Subscription Goldmine: SaaS Models and Startup Cash Flow Here's the brutal truth: nothing brings a tech solopreneur closer to existential dread than s…
Defeating the Multi-Tenant SaaS Concurrency Trap in PostgreSQL
Most backend engineers implement multi-tenant quota checks using a standard "read-then-write" pattern. In production, this pattern is highly unsafe: S…
Why Prompt Engineering Needs Software Architecture Principles (And How I Built PromptDev)
Most prompt libraries treat prompts like plain text snippets or random notes. But if you’re building production-grade AI features or complex system in…
Migration Friction Is the Real Cost of Switching Tools
Tool comparison posts obsess over feature matrices and monthly pricing. Both are the easy numbers. The expensive number is what it costs to leave , an…
Multi-Tenancy Architecture for SaaS
In Organizations, Teams, and Invitations we got people into the right organization: memberships, roles, invite flows, all the plumbing that decides wh…
Organizations, Teams, and Invitations
In Subscription Billing and Plans we wired up the part of the product that collects money. This article covers the part that gets people into the prod…
Subscription Billing and Plans
Last time, in Accepting Payments with Stripe , I covered the part everyone assumes is the hard bit: taking a card and moving money. It isn't, really. …
AI Agent Egress Proxy: Stop Tool Calls From Leaking Data
When an AI agent leaks data, it may not look like a breach at first. It may look like a normal tool call, a helpful API request, or a browser fetch th…
A Production Security Checklist
We spent the last article making the app fast. This one is about making sure it's still standing when someone tries to break it. That's the uncomforta…
Frontend-Only SaaS: The Rise of Static Utility Sites
Frontend-Only SaaS The combination of fast browser APIs (Web Crypto, Workers, WebAssembly) and generous third-party APIs (mail.gw, webhook.site) means…
Multi-tenant SaaS on a .NET workflow engine, without restarting to onboard a customer
The most expensive restart in SaaS is often the one nobody planned: onboarding a new customer. Every SaaS team expects adding a tenant to be a databas…
Do You Need an MCP Server for Your Product?
Build an MCP server only if you need external AI agents — Claude, ChatGPT, Cursor, or a customer's internal agent stack — to call your product directl…
Build a Multi-Tenant SaaS in Laravel 🏢
The SaaS Scaling Challenge When building B2B SaaS applications, you inevitably hit the "Tenancy" crossroad. You have hundreds of companies using your …
AI Can Generate a SaaS Prototype. Building the Product Still Takes Months.
You’ve probably seen posts that make building a SaaS with AI sound almost effortless: Give Claude one prompt, wait a few hours, and launch. That wasn’…
The Production Readiness Checklist
In the last article , I walked through finding and fixing the slow parts of a SaaS before launch: N+1 queries, missing indexes, unbounded payloads, th…
Stop Building Custom Auth for Your SaaS
I spent three weeks building a custom authentication system for my first SaaS. I wrote the password hashing logic, built the session management, handl…
A Git Workflow for Small Teams
The last few articles set up the folder structure that scales for a full stack SaaS: where the frontend and backend live, how a monorepo shares types,…
MCP Session Architecture: Scale Agent Integrations Without Sticky Servers
AI agents rarely fail because the demo was bad. They fail when the same workflow must run for many users, across many tools, behind real load balancer…
Feature Flags Without LaunchDarkly: A 100-Line Solution
You want to merge a half-finished checkout redesign into main without breaking checkout for everyone. You want to ship a risky billing change but keep…