Integration & interfaces: find the right entry point
When silos and manual handovers slow down processes, we distinguish between one API, the integration of a whole system landscape and an ERP rollout programme.
Quick orientation for APIs, system landscapes, ERP, Microsoft 365 and legacy – with separate entry points for interface and integration projects.
Services: Integration & interfaces: find the right entry point
API & interface development
REST, GraphQL and SOAP APIs that connect systems reliably.
View API & interface development →System integration
ERP, CRM and line-of-business systems in one coherent landscape.
View System integration →ERP implementation
Needs, vendor selection and rollout – Odoo-focused.
View ERP implementation →
Estimate your project costs
Use our interactive calculator for a first budget indication—free and non-binding.
Thorsten Frieling – Projektmanagement
Legacy modernization
Phased replacement with planned migration windows, testing and rollback options.
View Legacy modernization →Legacy code analysis
Risk report in five business days – make technical debt visible.
View Legacy code analysis →VB6 replacement
Scope, process and FAQ on the service page – Made in Germany from East Frisia.
View VB6 replacement →Find the right entry point in Integration & interfaces: find the right entry point
This integration & interfaces overview separates API projects from full landscapes: REST/GraphQL starts on API integration, process chains and estates on system integration.
Which integration or interface service fits your starting problem?
| Starting problem | Matching service | Next step |
|---|---|---|
| REST/GraphQL API, ERP/CRM connectivity, OpenAPI | API integration | API cost calculator |
| Whole landscape, data flows, process chains | System integration | Architecture audit |
| ERP rollout, processes, roles, data model | ERP implementation | ERP cost estimate |
| Microsoft 365, Teams, Exchange, SharePoint | Microsoft 365 consulting | Request migration check |
| Headless CMS, editorial workflows, webhooks | CMS development (API-first) | ERP-facing APIs |
| VB6, Delphi, monoliths – modernize step by step | Legacy modernization | Legacy code analysis |
| Many silos, media breaks, integration chaos | Solving integration chaos | Integration ROI calculator |
Direct answer: which integration service for what?
For a clearly scoped exchange using REST, GraphQL or OpenAPI, choose API integration. When multiple systems, owners and process chains interact, choose system integration.
ERP implementation additionally covers selection, processes, roles, data migration and rollout. Microsoft 365 has a dedicated consulting route (ERP implementation, Microsoft 365 consulting). New UIs and products live in the software & platforms cluster – Made in Germany from East Frisia.
APIs, system integration and legacy modernization belong together. With API integration and system integration we connect ERP, CRM and line-of-business systems. Depending on the case, we use REST, GraphQL, ETL or event-driven architectures.
A typical starting point: solving integration chaos with migration stages, tests and rollback options appropriate to the system. Continuous operation cannot be promised before dependencies and maintenance windows have been assessed.
We modernize existing estates step by step through legacy modernization: first legacy code analysis surfaces risks and dependencies. Modernisation waves or targeted replacement such as VB6 replacement. Read more in legacy modernization strategies.
Estimate costs and ROI with our API development cost calculator, legacy modernization cost calculator or integration ROI calculator. Integrations complement automation & workflows and new UIs from software & platforms; compare approaches in monolith vs microservices – Made in Germany from East Frisia.
Roles in the cluster: integration & interfaces
From single interfaces to full integration – each page covers a clear area. The matrix shows focus and delineation.
| Service | Role | Focus | Delineation |
|---|---|---|---|
| System integration | System landscape | Connect systems into one landscape | Integrating whole systems – not single APIs |
| API integration | Single API | REST, GraphQL and SOAP APIs | Single interfaces rather than full integration |
| ERP implementation | ERP programme | Selection, rollout, migration | ERP project rather than generic integration |
| Legacy modernization | Specialist topic | Renew legacy systems step by step | Modernisation rather than mere connectivity |
| Legacy code analysis | Specialist topic | Risk report in five business days | Review before delivery |
Related pages for Integration & interfaces: find the right entry point
Explore costs, solutions, comparisons, and related services for Integration & interfaces: find the right entry point.
Frequently asked questions: Integration & interfaces: find the right entry point
Concise answers help you assess service needs, prerequisites and the right next step.
What is the difference between API development and system integration?
API development delivers defined endpoints and contracts.
System integration connects multiple processes, systems and data flows end to end; both may be combined where needed.
Can legacy systems (VB6, COBOL, Delphi) be modernised in phases?
Often, yes.
Code and dependency analysis determines which modules can be encapsulated, replaced or run in parallel. Budget and residual risk depend on test coverage, interfaces and operational requirements.
How do you secure data flows and interfaces in operations?
Versioned APIs, monitoring, error handling and clear ownership; maintenance and support from Operations & support can be added when required.
Does ERP implementation belong in this cluster?
ERP rollout and DATEV/CRM connectivity are part of Integration – the overview routes to the right detail page and related interface and modernisation services.
Questions about our services?
Need a tailored quote? Contact us or book a consultation.
Thorsten Frieling – Project management
Or call us:+49 491 960 999 00
More service categories
Explore related topics – or return to the full services overview.
Quick context: Overview of this service category – with clear boundaries to related topics.
Service at a glance – for your decision
Integration & interfaces: compact service description
Definition: Integration & interfaces connects applications via APIs, ETL and system integration – maintainable interfaces, stable data flows and phased legacy modernisation without big-bang risk.
When it applies: When ERP, CRM, Microsoft 365, shops or legacy systems must exchange data, duplicate maintenance must end or VB6/COBOL/Delphi must be replaced in a controlled way.
Audience: IT leadership and project owners in the mid-market who prioritise operational stability during change.
Outcome: Documented interfaces, monitored data flows and a migration path with clear acceptance. Parallel operation and interruption risks are assessed from system criticality, testability and rollback options.
Approach: As-is analysis and interface design, pilot and test, rollout with monitoring and operational handover – including business sign-off.
Prerequisites and limits: Prerequisites and limits: documented systems, clear data ownership and windows for parallel operations. Limits: greenfield product builds and new shop/CMS launches sit in Software & platforms.
Differentiation: New visible products belong in Software & platforms; BI in Data & analytics; AI assistants in AI & ML.
Trust: API and integration projects since 2010, Made in Germany, with references across ERP, commerce and bespoke software.
Sensible next step: Sensible next step: book an integration workshop and name source systems for a credible interface plan.
Approach in steps
- Approach: As-is analysis and interface design, pilot and test, rollout with monitoring and operational handover – including business sign-off.
Up to 50% of your investment via BAFA/KfW
Use our funding calculator to see which government grants may apply to your project.
Björn Groenewold – Managing Director
