Software · 0 agencies
Integration agencies in Cologne compared
Most IT problems at mid-sized companies don't live inside a single system. They live between two systems that don't talk to each other. These agencies build interfaces and connect existing systems, and you can compare them by technology, minimum budget, and verified credentials.
No agencies in this category yet in Cologne. List your agency →
Guide
Where integration projects usually start
Inventory management, your online shop, accounting, CRM, and logistics providers run as separate systems in most companies, often from different vendors bought in different years. An integration agency builds the connection between them: custom APIs for your own systems, connections to third-party APIs, middleware that translates data between formats, and synchronization that keeps the same information current everywhere.
What matters in an integration project
First, error handling. What happens when a system briefly goes offline? A well-built integration absorbs that without losing data or creating duplicate entries. Ask specifically how the agency handles failed transfers.
Second, documentation. An interface that only the agency that built it understands becomes a black box. Ask for API documentation, ideally following an open standard such as OpenAPI, so other developers can read it after the project ends.
Third, security. Authentication between systems, encrypted transfers, and a well-thought-out permissions model belong in every serious proposal as a baseline, not as an add-on.
And finally, maintainability. Systems change, and APIs get updated or discontinued. An integration that needs to be rebuilt from scratch every time something changes was poorly designed in the first place.
What system integration costs
€100 to €170 per hour is standard. A single interface between two systems costs €8,000 to €25,000. Connecting several systems with middleware and monitoring runs €25,000 to €80,000. Complex integration landscapes with many stakeholders and high availability requirements start at €80,000.
What companies build interfaces for
Connecting an online shop to inventory management and shipping providers. Synchronizing customer data between CRM and accounting. A central API that lets several internal applications access the same data. Migrating outdated point-to-point connections to a central integration platform.
Filter, compare, request
Ranking follows the score, and ads are labeled as such. Filter the search by your existing systems and credentials, or submit a request.
Frequently asked questions
Integration agencies: questions and answers
What does system integration cost?
A single interface costs €8,000 to €25,000, connecting several systems with middleware runs €25,000 to €80,000, and complex integration landscapes start at €80,000. Agencies charge €100 to €170 per hour.
What exactly is an API?
A defined interface that lets two systems exchange data without either one needing to know the internal details of the other. It specifies which requests are possible and what responses come back. Good APIs are documented and don't change without notice.
How long does building an integration take?
A single interface is typically done in two to six weeks. More complex integration landscapes with multiple systems and test phases take two to four months. The biggest time factor usually isn't the technology itself but agreeing which system counts as the authoritative data source when they conflict.
What happens if a connected system goes down?
In a properly built integration, requests get queued and retried later instead of getting lost. Ask specifically about this mechanism when you request a proposal. It rarely comes up unprompted, but it's the most important part of the whole solution when something actually breaks.