Integration & interfaces: overview
Integration & interfaces overview: the list separates API projects, system landscapes, ERP, Microsoft 365 and legacy – entry via API integration or system integration.
Quick orientation for APIs, system landscapes, ERP, Microsoft 365 and legacy – with separate entry points for interface and integration projects.
Services: Integration & interfaces: overview
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?
API and interface projects start on API integration. Landscapes and process chains belong on system integration– without mixing generic integration topics on one page.
ERP in the mid-market and Microsoft 365 have dedicated entry points (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 – via REST, GraphQL, ETL or event-driven architectures. A typical starting point: solving integration chaos without big-bang risk.
We modernize existing estates step by step through legacy modernization: first legacy code analysis surfaces risks and dependencies, then modernizing legacy software 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.
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
Requirements, 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 and modernization without stopping operations.
View Legacy modernization →Modernise legacy software
Strategy and delivery for aging but business-critical software.
View Modernise legacy software →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 →Related pages for Integration & interfaces: overview
Explore costs, solutions, comparisons, and related services for Integration & interfaces: overview.
Frequently asked questions: Integration & interfaces: overview
Short answers to orient you in this cluster – the same content is marked up as FAQPage schema.
What is the difference between API development and system integration?
API development delivers defined endpoints and contracts; system integration connects processes, systems and data end to end – both services are linked from this hub and combined as needed.
Can legacy systems (VB6, COBOL, Delphi) be modernised in phases?
Yes – legacy modernisation, code analysis and replacement run staged with budget caps and risk reduction; details live on linked legacy pages, not as generic hub copy.
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.
Integration & interfaces: provider profile and approach
„Integrations become plannable when API projects, landscapes and ERP/M365 have separate entry points—not when every URL carries the same interface keywords.“
Questions about our services?
Need a tailored quote? Contact us or book a consultation.
Thorsten Frieling – Project management
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 – often parallel to live operations.
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
- Vorgehen: 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
