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APIS · BACKEND · INTEGRATION

Custom Software Development & Interfaces

We develop software modules and interfaces for your existing application, with source code and documentation.

Describe your project

When custom software makes sense

  • A process cannot be mapped with standard software, or only with workarounds.
  • Two applications need to exchange data that is currently transferred by hand.
  • An existing application needs a new feature without being replaced.
  • A component is too slow or hard to maintain.

What we implement, for example

  • Backend modules

    New services and features for your existing application, with defined external interfaces.

  • Interfaces between applications

    APIs and connections between business applications, such as your shop, inventory management system, CRM or in-house software. Integrating interfaces and APIs

  • Data synchronisation

    Batch jobs or event-driven synchronisation between systems, reconciled against expected values.

  • Extensions to existing software

    New features for existing applications, based on the agreed technical documentation, interfaces or code components provided.

  • Performance optimisation

    Measure bottlenecks with profiling and fix them. High-Performance

  • AI features

    Summarisation, search or classification as a feature in your application. AI & Data

For SAP, see SAP & ERP.

What makes an interface hold up in production

We define these points for each interface.

  • Data contract

    Structure, required fields and valid status transitions are documented.

  • One adapter per system

    If a system changes, this mainly affects its adapter. The process logic usually stays untouched.

  • Error categories

    Technical errors, business rejections and unknown outcomes are handled separately.

  • Idempotency

    Repeating the same operation should not create duplicate transactions.

  • Reconciliation

    Counts, totals and samples also find gaps that raise no error.

  • Traceability

    A correlation ID links event, processing and document across all systems.

Integrating interfaces and APIs →

How the result is measured

Acceptance criteria include, for example, the data an interface delivers or the response time of a module.

EXAMPLE · SHOP AND INVENTORY SYSTEM

What a project can look like

Your input
Description of the shop and inventory management system interfaces, sample data for products and stock levels, required synchronisation frequency.
Result
Stock levels and prices are synchronised automatically between shop and inventory management system, tested with the agreed test data.

Illustrative example of a possible project.

ALREADY DELIVERED · FROM OUR PARTNER NETWORK

Aspirits delivered write access to 22 external APIs with human-in-the-loop approval. The reviews uncovered three third-party defects.

Projects by our partners →

Frequently asked questions

Do you need access to our production systems?
Usually not. We develop with test data and mock services for your interfaces.
Which programming languages do you use?
The language depends on your existing application.
Can existing applications be extended without rewriting them?
Usually, yes. The new feature is built as a separate component with defined interfaces.

How scope, testing and handover are handled: How we work →

What should your software be able to do?

Tell us briefly which application should be extended or connected. I will get back to you within one business day.

Stephanie Escarciga · +49 15679 281048Mon–Fri, 7 a.m. to 6 p.m. (CET)

Describe your project