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Capabilities / Systems Integrations & APIs

Systems Integrations & APIs

CRM, scheduling, payments, databases, and industry software engineered to exchange information automatically — monitored, maintained, and trusted.

Your software should exchange information without depending on someone remembering to move it. When your CRM, scheduling, payments, accounting, and website agree with each other automatically, an entire category of work — and an entire category of error — disappears.

The executive version

Every business runs on handoffs: a lead becomes a contact, a contact books an appointment, an appointment becomes an invoice, an invoice becomes revenue in a report. In an integrated business, each handoff happens by itself, instantly, every time. In a fragmented one, each handoff is a person — copying, exporting, re-keying — and every person-handoff is a place where speed, accuracy, and customers get lost.

Integration is the engineering discipline of removing those person-handoffs. Not with duct tape, but with connections built to be monitored, maintained, and trusted.

What we connect

CRM platforms, scheduling and booking systems, payment processors, accounting software, marketing platforms, databases, phone systems, industry-specific software, and the website itself. Where two products offer a native connection that genuinely works, we use it. Where they don’t, we engineer one.

The technical version

For the buyers who want the layer down: we work directly with REST and GraphQL APIs, webhooks, and event-driven architectures; we build middleware and custom connectors where platforms have none; we handle authentication (OAuth, API keys, token rotation), rate limits, retries and idempotency, error handling, and logging. Every integration ships with monitoring — because a silent failure in a data pipe is worse than a loud one.

Two principles govern the work. First, one system is designated the source of truth for each kind of record; everything else synchronizes against it. Second, an integration is a product, not a script: documented, monitored, and owned.

Signs you need this

  • Anyone in the company maintains a spreadsheet that exists to reconcile two systems.
  • Customer records disagree between platforms, and nobody is sure which is right.
  • A subscription got bought specifically to work around another subscription.
  • “We’d switch, but everything is wired into it” — the wiring nobody can draw.

Running a spa or wellness stack? We’ve drawn the common ones honestly — Boulevard, Mindbody, GoHighLevel, Mailchimp, and the seams between them — in the systems we work inside.

Capabilities work as one system

CROSS-REFERENCE
  • Systems Strategy & Architecture
  • Revenue & Customer Systems
  • Integrated Web Platforms
  • Data & Infrastructure
  • Automation & Intelligent Systems

Next step

Start with the architecture.

A systems assessment maps how your business actually operates, where it leaks, and what should exist — before you commit to building anything.

Request a systems assessment

Prefer email? rob@oller.me

Systems engineered for growth.

Capabilities

  • Strategy & architecture
  • Integrations & APIs
  • Revenue & customer systems
  • Integrated web platforms
  • Data & infrastructure
  • Automation & intelligence

Systems

  • All systems
  • Boulevard
  • Mindbody
  • GoHighLevel
  • Mailchimp
  • The Boulevard stack
  • The Mindbody stack

Company

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Contact

  • rob@oller.me
  • Request a systems assessment
Horizon Systems Automation · Growth Systems Engineering © 2026 Horizon Systems Automation. All rights reserved.
  • Capabilities
  • Industries
  • Approach
  • Case studies
  • About
  • Request a systems assessment
Systems engineered for growth.
rob@oller.me