Halfsquare · Berlin
Custom digital solutions for Berlin businesses.
We are a small developer workshop in Berlin, building what you actually need. AI-powered workflows, booking systems, e-invoicing integrations, or something that doesn’t exist yet. Fixed price, two weeks, one point of contact.
Services
What we’re working on a lot right now.
These six topics come up most often right now, usually with a deadline or a specific pain point. If something else is on your plate, just ask. We’ll tell you honestly whether we’re the right partner.
01
E-invoicing & XRechnung
Starting 2027, companies above 800,000 euros annual revenue must send B2B invoices as structured XML. From 2028, this applies to everyone. Receiving them is required as of today.
Master-data cleanup, export adapter, KoSIT validation, GoBD-compliant 10-year archive. Including older systems like Sage Büro+, Dynamics NAV, or custom Access databases.
Small businesses from €2,500 · Mid-sized €8,000–25,000 · Legacy €15,000–60,000
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02
Reservation system setup
You need a modern reservation system for your restaurant. Maybe you don't have one yet, maybe what you have stopped pulling its weight. Especially urgent right now for Quandoo customers before 30 September.
We pick the right system, set it up at your venue, and hand it over to your team. Migration from existing systems, Google integration and training are part of the package. Up and running in two weeks.
€1,490 fixed price
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03
Accessibility audit (BFSG) for online shops
Since 28 June 2025, digital offers in Germany have to be accessible by law. Fines of up to €100,000 per violation.
Quick-Check audit, written findings, fix sprint, accessibility statement published. Monthly monitoring on request.
from €1,490
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04
AI phone + online booking
You're in the middle of cutting a child's hair. The phone rings for the third time. Up to 30 percent of your calls go unanswered.
An AI receptionist that books appointments directly into your Doctolib, samedi or Shore. Bundle of phone assistant and booking system. Fixed price, 14 days.
€1,880 setup + €248 / month
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05
Google visibility
Your Google profile has 30 reviews, the competitor two streets over has 280. You see it every day in Maps search.
Profile maintenance, review automation, "Book an appointment" integration. Most customers see their first new reviews within four weeks.
€590 setup + €249 / month
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06
Other services
Staff scheduling, WhatsApp orders, multilingual chat, CRM, POS, the German healthcare TI connection. Whatever else you need that does not fit into a box.
On request. We tell you honestly whether an existing tool solves it, or whether we build something custom.
On request
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Custom work
Something else on your mind?
Our strength isn’t a list of products. It’s that we actually build. If you have a problem with no off-the-shelf solution, or one where the standard solution doesn’t fit your business, let’s talk.
Schedule a callWhy us
Three things that define our work.
Fixed price, no hourly roulette.
You know what you’re paying before the project starts. Not “approximately,” not “depending on scope.” Fixed price.
Two weeks, not two quarters.
With modern developer tools, including AI, we deliver projects in two weeks. The delivery date and the fixed price are in the quote before we start.
Directly with the developers.
You talk to the person building your system. No account manager, no handoffs, no telephone game.
Let us talk for 15 minutes.
Not a sales call. We look at your situation and tell you honestly whether we can help. If not, we tell you who the better fit would be.
Book a call