PIPELINEGuide
Connecting custom software with existing systems
Does everything need to be replaced for this? Usually not. What can be connected to an existing system landscape, where the limits are, and which part typically takes the longest.
In most cases, nothing existing needs to be replaced for custom software: inventory management, CRM, calendar, accounting or phone system are connected via interfaces. The deciding factor is whether the respective system has a documented interface — and the time-critical part is almost never the technology, but obtaining the access credentials.
01 — Integration
Connection with existing systems
The most common misconception is that everything must be new. In most cases, the existing system landscape remains, and custom software builds on top of it — through interfaces, not through replacement.
What gets connected in practice: ERP, CRM, calendar, accounting, phone system, newsletter system, website. What matters is whether the respective system has a documented interface. Where none exists, there's usually a workaround — but that costs effort and needs to be clarified up front, not discovered later.
The time-critical part is almost never the technical integration, but obtaining access credentials. Starting early here noticeably shortens the project timeline.
02 — Requirements
What you need for custom software
- A clearly defined trigger. Not “we should do something with AI,” but a process that demonstrably costs time or orders today.
- Existing content or data. Custom software works with what's there. The more complete the starting point, the shorter the setup.
- Access to the systems involved. Whoever manages the credentials needs to be involved from the start — this is, in our experience, the most common cause of delays.
- One decision-making contact person. One, not three.
- Willingness to refine after launch. The first weeks in real operation show what was missing in the concept. That's normal and accounted for.
03 — Bottlenecks
What typically causes delays
- Content and deliveries. By far the most common cause of delay. Text, images, price lists, access credentials — what's missing blocks progress.
- Decisions. When it's unclear who approves, the project waits. A named contact person with decision-making authority noticeably shortens the timeline.
- Access to third-party systems. Getting access to inventory management, phone systems, or CRM regularly takes longer than the integration itself.
- Endless review rounds. Two correction rounds are normal, five are a sign that the goal wasn't clear at the start.
04 — Questions
Frequently asked questions
Does this run on our own servers or in the cloud?
Both are possible. For most businesses, a cloud solution is lower-maintenance; where data must not leave the premises, we set it up on your own infrastructure.
How do we avoid the project going off the rails?
Small steps with usable results, fixed budgets per step, and the option to exit after each step. Large fixed-price projects over twelve months are the most reliable path to disappointment — for both sides.
Who owns the source code?
You do, completely, upon payment. That's in the contract. You can take it to any other developer — that's the point.
How many users can a system like this handle?
That depends on the architecture, which we plan according to your expected growth — from a few users in your own business to several hundred across multiple locations.
What if we discover new requirements during development?
That's normal and planned for, because we work in small steps. A new requirement is incorporated into the next step, instead of stalling the entire project.
When does custom software pay off compared to standard software?
When your process is a genuine competitive advantage, when standard software only fits seventy percent and the rest ends up as manual work, or when license costs per user exceed the development cost over a few years. If it's only about convenience, standard software is cheaper.
What happens if we no longer work together?
You have the code, documentation, and access. We deliberately use widespread technologies so that a switch is possible without someone having to rebuild everything.
05 — Next
Related pages
- Custom software — Overview
- Custom software — How it works
- Custom software — Pros and cons
- Custom software — Process
- Custom software — Funding
- Custom software — Do it yourself
- Custom software — Checklist
- Custom software — Ongoing operation
- Process automation
- CRM integration
- API Interfaces
- All guides
Custom software by region
Next step
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Briefly describe what you need. You'll get an honest answer about what's realistic and what it will roughly cost.