Callaars & De Gruyter · dev shop, North Brabant
From a brand-new idea to an AI concept that already works but doesn't scale yet: we deliver it, in production, not as a demo. Twenty years of software engineering. AI integration is one of our specialties, small and large projects side by side.
Got an idea for a software product, small or large? We'll build it.
from €12,000, fixed price
From idea to working product. The smallest version that actually helps a real user, hosted and usable.
Price on request
A larger project with a defined end point: a complete platform, not a single component.
from €20,000, first phase
Your concept already runs internally. We get it ready for customers, without budget surprises.
Already built something with AI? A pilot, an internal prototype, your own tool. We turn it into a product that scales. Also our trade, not the only one.
from €900, within a week
A quick check: which integrations are feasible, is RAG worth it for your data.
from €2,950
Workshop and AI-literacy file. Half a day, a file as the result.
€6,500
System map, data-flow map, five scored use cases, 2 weeks.
€18,000–28,000
One use case into production, 6–8 weeks.
from €4,000/mo, capacity model
Ongoing engineering capacity: software or AI integration, no fixed scope.
Conversations with the people doing the work. A team with a stalled pilot, or someone with an idea on a single sheet of paper.
Scope, approach and fixed price, tailored to the ask: a system map and use cases for an AI pilot, a product scope for an MVP.
Fixed price, fixed scope, in production: the Production Sprint or the MVP Sprint.
Dedicated capacity. Ongoing involvement, new work, one point of contact.
We've been building software since 2004, and doing it from our own company since 2009. AI is a layer on top, not a new trade. The difference shows the moment something actually has to run: integrations, permissions, logging, error handling, exactly where things usually go wrong, on an AI pilot just as much as on a new product.
We take on a handful of engagements a year. No outsourcing, no subcontractors, no disappearing act after launch. Whoever designs the thing maintains it.
Careers — a dev shop that's growing on purpose.
A 30-minute call. You describe what's been built and where it's stuck, we tell you honestly what we think it's stuck on, and whether we're the right fit.