Fixed price after scoping
For clearly defined projects we make a fixed-price proposal after the first call. You know exactly what it costs upfront.
One sum. No surprises.
// SERVICE 02 — APIs & INTEGRATIONS
Systems that talk to each other.
Your ERP doesn't know your webshop. Your accounting gets numbers by copy-paste. We build the interfaces that finally connect your tools.
// THE PROBLEM
Island solutions that don't work together.
Each tool is fine on its own — but they don't talk to each other. Data gets transferred by hand, maintained twice, pushed back and forth via Excel. Every transfer error costs time and nerves.
// OUR SOLUTION
Interfaces that let data flow.
We connect your systems through clean APIs. Data moves automatically where it's needed — in real time, without manual work. Even if one of the systems is a legacy program from 2008.
// WHAT WE BUILD
Concretely, that means:
01 / 06REST & GraphQL APIs
api.exostruction.de/v1/orders
POSTapi.exostruction.de/v1/orders201 Created
Headers
Authorization: Bearer eyJhbGc...
Content-Type: application/json
Request
{
"customerId": "C-4821",
"items": [
{
"sku": "EX-2024",
"qty": 3
}
],
"source": "webshop"
}Response
{
"id": "ORD-9182",
"status": "accepted",
"erpRef": "A-2481",
"eta": "2026-04-02"
}Response time48 ms
Modern, documented interfaces built to current standards — clean and understandable for other developers.
- REST
- GraphQL
- OpenAPI
// TECH STACK
What we build it with.
Proven technologies, no experiments on your project.
DOCUMENTATION
OpenAPI / Swagger
So interfaces are documented and usable for others — not just in our heads.
PROTOCOLS
REST & GraphQL
The established standards for modern APIs. Understandable, widespread, well-supported.
BACKEND
.NET / Node.js
Proven, performant backends for API logic. Scales with the load.
DATABASE
PostgreSQL
Reliable data storage. No license risk, battle-tested for decades.
AUTOMATION
n8n
Self-hosted workflow automation — connects systems without deep custom development where it fits.
DEPLOYMENT
Docker
Interfaces run in isolation and reproducibly. No 'only works on one server'.
The specific choice depends on the project — we use what fits the task, not what's trending.
// HOW IT WORKS
From idea to finished interface.
No mysterious process. Five clear phases — you always know where your project stands.
01
02
03
04
05
First call
Which systems need to be connected? We look at the interfaces, data formats and constraints. Non-binding and free.
Analysis & concept
We check which APIs exist, where gaps are, and what the data flow should look like. This becomes a transparent proposal.
Development & testing
We build the interfaces and test them against real data — in short cycles, with intermediate results to review.
Integration & launch
The interfaces go live. We accompany the connection to your production systems and monitor the first data flow.
Ongoing support
APIs need maintenance — systems change, formats change too. We stay reachable for adjustments and monitoring.
// HOW IT WORKS
From idea to finished interface.
No mysterious process. Five clear phases — you always know where your project stands.
01
First call
Which systems need to be connected? We look at the interfaces, data formats and constraints. Non-binding and free.
02
Analysis & concept
We check which APIs exist, where gaps are, and what the data flow should look like. This becomes a transparent proposal.
03
Development & testing
We build the interfaces and test them against real data — in short cycles, with intermediate results to review.
04
Integration & launch
The interfaces go live. We accompany the connection to your production systems and monitor the first data flow.
05
Ongoing support
APIs need maintenance — systems change, formats change too. We stay reachable for adjustments and monitoring.
// PRICING
What does it cost?
Honest answer: it depends on the project. A single interface is different from integrating five systems. Instead of a flat number that won't be accurate anyway, we do it like this:
Start
How defined is your scope?
Day rate for ongoing work
For ongoing development or unclear scope we work on a day-rate basis — billed transparently, fully traceable.
Logged to the hour.
Always: free initial call
The first conversation and a rough estimate cost nothing. Only once it's clear that it's a good fit do we talk numbers.
60 minutes. Call or on-site.
No hidden costs, no surprises on the invoice.
// FAQ
Good to know.
Other services: