Custom software development for business goals.
We build web-based business systems, customer and partner portals, internal platforms and integrations when standard software no longer fits the process or growth objective. AI-native delivery accelerates implementation, while named professional accountability protects architecture and code quality.
No obligation · NDA welcome
When is a custom system justified?
Custom development creates value when the process differentiates the business, data from multiple systems must be connected, or the limitations of a standard product already cause measurable operational loss.
If a market-ready SaaS product covers the process without material changes, its implementation should be considered first.
What does AI-native delivery mean for a custom system?
We use AI to accelerate clearly defined parts of requirements analysis, specification, code drafting, refactoring, test-case creation, code review and documentation. Named professionals make the product and architecture decisions and approve critical business logic, security controls and release.
For the client, this may mean demonstrable increments sooner and more value delivered within a given period, without a guaranteed multiplier in advance.
What types of systems do we build?
- customer and partner portals
- internal workflow and approval systems
- billing, logistics and operational platforms
- data and reporting interfaces
- APIs and integrations that connect existing systems
What does AP4 own, and what does the client own?
- professional leadership of the agreed scope
- UX and architecture
- development and testing
- release
- appointing decision-makers and process owners
- providing access to the required systems
- approving business decisions on time
- approving acceptance results on time
Delivery and quality
We work in short iterations, with regular demos and a visible decision log. Before release, we define the functional, security, performance and handover criteria; production launch includes documentation and a rollback plan.
Cost and timeline
A well-defined custom solution typically takes 4–17 weeks and starts from €13k net. The final range depends on roles, integrations, migration, security, availability and depth of testing.
When scope is uncertain, we recommend a 1-3-week discovery.
Frequently asked questions about custom systems.
Something else? Email hello@ap4.hu and we will answer directly.
Show us your current process or product idea.
In the first consultation, we will tell you whether custom development, integration or a standard product is the more realistic route.
No obligation · NDA welcome