CUSTOM SAAS DEVELOPMENT
Custom SaaS Development Agency
We design, build, and run custom SaaS products for B2B companies, from a first pilot to a platform at scale. We build it, and you own it.
Fountain City is a boutique software studio. We build custom SaaS applications for companies that have outgrown off-the-shelf tools or are bringing a new product to market. A small senior team takes a product from discovery through architecture, pilot, and scale, and stays on to run it if you want. We build on Anthropic’s Claude and modern web infrastructure, so the AI inside your product is designed in, not bolted on later. You own the code and the IP.
BUILD OR BUY
When custom SaaS is the right call
🧩 When off-the-shelf is not enough
If a standard tool covers most of what you need, buy it. We will tell you when that is the honest answer, even though it is not work for us.
🔌 When no-code gets you only so far
A no-code tool can validate an idea cheaply, and we will say so. We also see where teams hit the ceiling, and we build the version that scales past it.
🏗️ When custom earns its cost
When the software is the product, when your workflow is your edge, or when no tool on the market fits, a custom build pays back over years instead of renting forever.
WHAT WE BUILD
The SaaS we build
🏢 B2B SaaS products
Products you sell to other businesses, with the billing, roles, and reliability that buyers expect.
🏬 Multi-tenant platforms
One codebase serving many customers, with isolation, per-tenant config, and usage you can meter and bill.
🎯 Vertical SaaS
Software shaped to one industry’s workflow, where generic tools leave money and hours on the table.
🧰 Internal tools and admin platforms
The operational software a team runs on. Often the highest-leverage thing we build, and the least glamorous.
🚀 SaaS pilots
A real, shippable first version that proves the idea with users, not a throwaway demo.
🤖 AI-native SaaS
Products where the AI is the point. We build on Claude, with the retrieval and guardrails that keep it reliable in production.
OUR PROCESS
How we work
01 Discovery
We map the problem, the users, and the must-haves before we write code. Short, focused, and honest about scope.
02 Architecture
We design the data model, the stack, and how it scales, so the pilot is not a dead end you rebuild in a year.
03 Pilot
We ship a working product to real users fast, because what people do beats what they say they will do.
04 Iterate
We build against real usage, tightening the parts that matter and cutting the parts that do not.
05 Scale and run
We harden it for production and keep running it if you want, or hand it over clean if you do not.
THE STACK
Built on a durable stack
We are not religious about tools, and we pick the boring, durable ones for the foundation. A typical build uses React and Next.js on the front end, Node and Python on the back end, PostgreSQL for data, and AWS or Google Cloud for infrastructure. For the AI layer we build on Anthropic’s Claude, and we move fast using AI agent teams to write much of the code under senior direction. We use what fits your product and your team, and we tell you why.
BUILT ON CLAUDE
A Registered Claude Partner
Fountain City is a Registered Claude Partner in Anthropic’s partner program. We build production software on Claude every day, including the autonomous agents that run our own business. The AI inside your SaaS is built by people who work with these models full time, not bolted on by a team learning as they go.
WHY BOUTIQUE
You own it, and you choose how you pay
👥 Senior people, no handoff
The people who scope your product are the people who build it. No bait-and-switch to a junior offshore team after the contract is signed.
📦 You own the result
You get the code, the IP, and the freedom to take it anywhere, including the option to hire your own AI development team later. Pay to own the build outright, or offload most of the upfront cost and pay as your platform grows. It is your call, and either way it is only upside.
🧭 27 years, vendor-neutral
Fountain City has shipped software since 1998. We have no platform to upsell you and no incentive to overbuild.
HOW WE ENGAGE
Engagement models
📐 Fixed scope
A defined build at a fixed price, for when the scope is clear. Good for pilots and well-understood projects.
🔄 Dedicated team / retainer
A senior team working with you month to month, for products that evolve and need ongoing build and run.
🤝 Build partner
Lower your upfront costs substantially by tying your monthly spend to the number of clients and revenue you make.
SELECTED WORK
Real products, in production
We have built and shipped custom SaaS across many industries, including fitness and wellness, entertainment, education, legal services, real estate, food, loyalty and rewards, marketing, and developer tooling. A sample is below, and we can walk through more on a call.
Unleashed Consulting
We built the Pepper ad-monitoring SaaS at near cost for Unleashed Consulting, who resell it to their 80 local businesses they serve. Read the case study.
Leonardo247 SaaS Modernization
We modernized the SaaS application behind Leonardo247, bringing an established platform up to current architecture. Read the case study.
Global Linux Monitoring Platform
A SaaS tool that lets system administrators watch every Linux server they run from their phone, with alerts and remote handling of common problems.
IN BUILD NOW
What we are building right now
Systamesh
An AI recommendation platform built for both people and AI agents to use. In build, launching soon.
Programate
A platform for autonomous, self-reflective agent hiring and builds. In build, launching soon.
PRICING
What it costs
There are two ways to pay for a build, and you pick the one that fits. Either way it is only upside, and we give you a real range before you commit rather than a number off a rate card.
💵 Pay and own it
You fund the build and own the product outright, the code and the IP. There is no ongoing fee to us, and you are free to run, change, or sell it. This is the simplest model when you want full control from day one.
📈 Low upfront, pay as you grow
We offset most of the upfront cost, then charge a fee based on how many clients your platform serves. You offload the majority of the investment and only pay as the platform grows and adds customers and users.
WHAT CLIENTS SAY
Passionate customers, real partnerships
We Have Passionate Customers Who Have Benefited From Our Partnership
Fountain City has been very good at providing the desired results without a lot of hand-holding.
They always have our best interests at heart and come to the table with excellent suggestions based on their experience.
Fountain City offers an excellent personal touch and is very approachable while being very professional still.
Fountain City’s results, honesty and attention to detail stand out. They’re very realistic as well.
I’m always confident they’ll take the lead to ensure that the project runs smoothly and in the manner that I expected.
Results and relationships matter to this team, and it makes for a pleasant and productive experience.
FAQ
Frequently asked questions
LET’S TALK
Tell us what you are building
Tell us about the product you want to build. A real person responds within one business day.
