What is SaaS?

SaaS is "Software as a Service", software you access online without installing it. You log in, use it, and pay a subscription. The vendor hosts it, maintains it, and pushes updates without asking you. You own no servers, no infrastructure, just the account.

How SaaS works

You buy access, not the software. A traditional software license lives on your computer. A SaaS product lives on the vendor's servers. You log in from anywhere, your data is stored there, and the vendor decides when to push updates.

The vendor's incentive is to keep you subscribed. So they maintain it, add features based on what many customers need, and handle scaling. You don't run the servers. You don't pay for infrastructure. You pay monthly or yearly for access.

That's the trade-off. Convenience and low upfront cost, but you don't own the code or the data, and you're bound to the vendor's roadmap and pricing.

Built-in vs custom

Most businesses use off-the-shelf SaaS: Slack, Stripe, Salesforce, Notion, Google Workspace. Someone else built it for thousands of customers. It's mature, features are rich, and you're paying the same price as everyone else.

But some businesses need a SaaS product built just for them. That's when custom SaaS earns its place:

• Your product is your business. You're selling access to software, not using it to run your own operations. That software needs to be bespoke.
• Your customers expect it to work your way. A standard product forces them to adapt to generic workflows. Your SaaS needs to fit your brand, your process, your edge cases.
• You need to own the code and the data. If your customers' data is the relationship, you can't be dependent on a vendor's subscription model. You need to control it.

I build custom SaaS on Next.js and React with Supabase as the database. It's a product you own and operate, with the same look and feel as an off-the-shelf platform, but built around your business.

SaaS components (the things that need to work together)

A SaaS product has a few layers:

• Authentication. Users log in, reset passwords, manage accounts. Supabase handles this without you building custom login logic.
• Multi-tenant architecture. One SaaS instance serves many customers, and their data is isolated. If you're selling to ten customers, they don't see each other's data.
• Storage and database. All customer data lives somewhere secure, backed up and compliant with their legal requirements. Supabase handles that.
• Frontend. The interface customers see. I build this in React and Next.js. It's fast, responsive and feels like a real product.
• Integrations. Often your SaaS needs to talk to other tools your customers use: Stripe for billing, Slack for notifications, their own CRM. That's where APIs and webhooks come in.

None of that is magic. It's just wired correctly so it works at scale without melting down when you have fifty customers.

Custom SaaS vs agency build vs off-the-shelf

Off-the-shelf (Salesforce, HubSpot, Zapier): built for thousands, mature, hundreds of integrations, but expensive if you're one user and you need to bend the workflow. Fast to deploy but limited to the vendor's roadmap.

Agency build: A team designs and codes a custom product for you. It's bespoke, but expensive and slow. Most agency builds overshoot scope, get delayed, and then you're stuck maintaining code you don't understand.

Custom SaaS (what I build): Built for you and your customers, owned by you, hosted by you (or Vercel), operated by you. One person removes the typical agency bloat. Timelines are shorter because scope is clear. You own the code and decide how to evolve it.

How custom SaaS gets made

1. Scope the product. What does it do? Who uses it? What's the job it actually does?
2. Design the database. What data needs storing, and how do customers' data stay isolated?
3. Build the authentication layer. Users log in securely, can reset passwords, can manage their account.
4. Build the product. The interface customers see. Built in React and Next.js so it's fast.
5. Wire integrations. Connect to Stripe for billing, Slack for alerts, whatever your customers depend on.
6. Ship and operate. It goes live. You operate it (or I can handle that too). Updates ship without customers installing anything.

It's production-grade from day one. No "let's demo this on a staging server." It's live and working.

When custom SaaS makes sense

You're selling software or a service that runs on software:

• A reporting tool for agencies. Each agency logs in, sees their client data, exports reports. You charge per month.
• A portfolio platform for advisors. Advisors upload their holdings, clients log in and see their portfolio. The platform moves the money back and forth.
• An operations tool for a service business. Staff log in, see jobs, mark them complete, generate timesheets. The system handles billing.

In all those cases, the SaaS is the relationship. Your customers are dependent on it, they pay for it, and you own the codebase so you can evolve it as your business grows.

The cost and timeline question

A custom SaaS costs more upfront than buying Salesforce. It takes longer than deploying Slack.

But:

• You own it. No vendor lock-in. No price hikes next year because the vendor decides you're valuable.
• You control the roadmap. If your customers ask for a feature, you build it. You don't wait for the vendor's quarterly release cycle.
• You can charge as much as the market will bear. If you're selling a SaaS product, the unit economics are yours.

Scope and timeline are clear before work starts. One person builds it, so there's no meeting overhead or handoff losses.

Next steps

If you're building a product your customers log into, or you need a tool to sell as a service, let's talk. Book a free call, or message me on WhatsApp, and I'll tell you straight whether custom SaaS is the right move or if off-the-shelf will work.

I also build custom software for operations and internal tools, and web applications if what you need is a marketing site instead.