Delphi estate: new interfaces without a big-bang rewrite
Extending an existing Delphi suite with REST and batch interfaces to a new CRM—the legacy app stays operational; deeper migration can follow later.
Delphi estate: new interfaces without a big-bang rewrite
Delphi development
The Challenge
Legacy data must sync with CRM
A proprietary data format needed exchange with a SaaS CRM without a risky freeze; a rewrite was not affordable short term.
Our Solution
Adapter layer and controlled releases
We encapsulated import/export in a service module with retries and audit logs; REST endpoints were versioned. Tests validated round trips against reference datasets.
Results
Operations without downtime
The legacy stack stays productive; CRM-led projects receive data on time. Follow-on releases supported from East Frisia.
Features
Feature overview
- REST adapters with authentication and logging
- Batch jobs with monitoring and manual intervention
- Backward-compatible data models for pilot customers
Frequently asked questions: Delphi maintenance and new interfaces
Is Delphi maintenance worth it when new interfaces are required?
Yes, when domain logic lives in the legacy stack and a big-bang rewrite would be too risky. ERP, CRM, web portals or accounting exports can often be connected via REST adapters and middleware without replacing the core immediately. Delphi development and API and interface development are combined—incrementally, not all at once.
What are the risks of a big-bang Delphi rewrite?
Long feature freezes, data migration, maintaining two systems in parallel and losing implicit domain rules built over years of operation. Incremental interfaces keep the legacy stack productive while you modernise legacy software step by step.
How does an API façade in front of the Delphi core work?
External systems use REST or JSON; the façade maps to existing Delphi logic and the database. Authentication, logging, versioning and error handling sit centrally—the legacy core stays under control. That yields stable contracts for partners and SaaS tools without a monolithic rebuild.
How is parallel operation and stability ensured when connecting new systems?
Contract tests, staging environments, phased rollout and monitoring of latency and error rates. Critical paths are secured first; batch jobs get retry and audit logs. With several systems, thoughtful system integration beats point-to-point wiring.
When is migration to .NET better than Delphi maintenance alone?
When team skills, framework end-of-life, scaling limits or integration load permanently block the estate. Then extract modules step by step—not all or nothing. We plan Delphi to .NET migration with a pilot module and credible sizing—the Delphi cost calculator gives initial budget ranges.
Project Details
Context
ISV with long-lived Delphi product line
Completed
Multiple releases with backward compatibility
Technologies
More References
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