About QUANT LAB USA
A small, founder-led software and security shop that builds systems businesses actually use.
The Story
QuantLab exists because too many businesses get stuck with software that doesn't fit how they actually work. A motorcycle shop running inventory in one tool, work orders in another, and invoicing in a third. A contractor spending four hours on every proposal because the template software doesn't know how his pricing works. A trader with a strategy that runs fine on paper and falls apart the first time the market moves.
William started QuantLab in Georgia after a decade of seeing the same pattern from the inside — generic SaaS for specific problems, consulting firms that sell strategy and subcontract the code, agencies where the person selling the project is never the person building it. The premise of QuantLab is simpler: the person you talk to is the person who writes the code. Nothing gets lost in translation because there's no translation layer.
The philosophy is to own the whole stack. Front end to database. Auth to payments. Deployment to monitoring. Not because that's a flex, but because real business problems don't live neatly in one layer — the interesting failures happen at the seams between them, and you can't fix what you don't understand.
Who We Work With
We don't target a single vertical. The common thread across our clients is that they've outgrown off-the-shelf tools and need something built around how their business actually runs.
In practice, that's meant trading firms who need live execution systems, shop owners who need operations platforms that replace a dozen disconnected tools, contractors who need estimating engines that match their pricing logic, and security teams who need adversarial testing that goes beyond a vulnerability scan.
How We Work
Small. Senior. Direct. The engagement starts with a call, not a pitch deck. If the project fits, we follow up with a written scope and a quote that breaks out what you're paying for. If it doesn't fit, we'll tell you that too and point you somewhere better.
There are no account managers here. No project coordinators layered between you and the engineer. When you need to change a requirement, discuss a bug, or ask a blunt question about whether something is really necessary, you email the person who's actually building it.
When a project needs more hands than the founder, we bring in engineers we've worked with and trust. We don't subcontract to agencies. Code review and architecture decisions stay in-house.
The Founder
William Beltz
Founder & Lead Engineer
I started QuantLab because I kept running into businesses stuck with software that didn't fit how they actually work, and I got tired of watching it happen. I write the code myself — from database schemas to deployment configs — and I work directly with every client.
My background is full-stack engineering with a heavy bias toward systems that touch real money or real operations: live trading platforms, payment infrastructure, and operations software that runs day-to-day businesses. The security work grew out of the same instinct — if you build systems, you should know how they break.
Tech & Values
What we care about.
We ship real things
We measure our work by what's running in production, not by slide decks. Every system on our services page is live somewhere, doing the job it was built for.
We build partnerships, not transactions
Most of our clients stay with us after the initial build — for support, new features, or the next project. That's how we want to work: long-term, not project-to-project.
Security isn't a bolt-on
We run penetration tests for a living. That perspective shows up in everything else we build. Auth, data handling, and infrastructure are thought through from day one.
Quality beats velocity theater
We'd rather ship a smaller scope that works than a larger one that limps. Clients don't remember how fast a project felt. They remember whether the thing worked a year later.
Day-to-day tech
Want to work together?
Start with a call. You tell us what you're building, we'll tell you whether we can help.
Call (770) 652-1282or emailbeltz@quantlabusa.dev