Systems integration and custom APIs
Make your systems work together.
Replace duplicate entry, fragile file transfers, and disconnected workflows with dependable integrations designed around how your business operates.
Discuss an integrationIntegration is more than moving data
A reliable integration has to understand what the data means, when it should move, who owns it, what happens when a system is unavailable, and how failures will be detected. I design custom API and systems integrations with those operational realities in mind.
Integration capabilities
- REST and custom API development
- Legacy application API enablement
- ERP and accounting integration
- Payment processing workflows
- CRM and line-of-business platforms
- AWS and cloud services
- Database and data synchronization
- RESO and real-estate data
- IoT devices and production equipment
- Scheduled and event-driven automation
Designed for reliability
Production integrations need authentication, validation, retry behavior, logging, monitoring, reconciliation, and a clear source of truth. These are not optional details. They determine whether an integration reduces work or creates a new category of invisible errors.
Modernize without replacing everything
Integration can extend the useful life of a proven application. A well-designed API layer can connect older software to new customer experiences, analytics, cloud services, partner platforms, and automation while a broader modernization plan proceeds at a responsible pace.
Real-estate and RESO integration
I have worked with real-estate applications and the RESO Web API, including the practical challenges around MLS data, authentication, field mapping, replication, and maintaining a dependable local data model. Learn more about RESO Web API integration.
Production integration design
Plan for the day one system is unavailable.
An integration is dependable only when failure behavior is designed as carefully as the successful path. That means deciding which system owns each field, how duplicate messages are handled, when requests are retried, how partial work is reconciled, and who is notified when automated recovery is not possible.
Controls that prevent silent data problems
- Idempotency and duplicate protection
- Input validation and explicit field mapping
- Retry limits and dead-letter handling
- Structured logs and correlation identifiers
- Reconciliation reports and exception queues
- Credential rotation and least-privilege access
“Our administrative portal is seamlessly integrated into our card processing system, accounting platform and banking.”Equipment-rental platform client
Systems integration questions
Can you add an API to a legacy PHP application?
Yes. A controlled API layer can expose selected capabilities without making the entire legacy application public or forcing an immediate rewrite.
Can you repair an integration built by another vendor?
Yes. The assessment begins with data ownership, authentication, payloads, logs, failure behavior, schedules, and the business process affected by errors.
Do you integrate industrial and cloud systems?
Yes. Mark’s experience includes industrial IoT, telemetry, AWS platforms, enterprise applications, field operations, and reporting. See industrial IoT and SCADA development.
For broader operational platforms, see custom software development services.