System Integration & API Development
Overview
Most businesses run on more than one platform — and the gaps between those platforms are where time, money, and data get lost.
Angel City Data specializes in connecting your existing software ecosystem so your tools talk to each other automatically.
Whether you need to sync your CRM with QuickBooks, connect a FileMaker database to a web platform, or build a custom API that ties your entire tech stack together, we make it happen cleanly and reliably.
We've integrated with dozens of major platforms including QuickBooks, FreshBooks, Xero, MailChimp, Slack, Twilio, DocuSign, Stripe, and more — using REST APIs, webhooks, Claris Connect, and custom-built middleware.
What is System Integration & API Development?
System integration is the process of connecting separate software applications so they share data and work together as a unified system.
An API (Application Programming Interface) is the technical bridge that makes this possible — it defines how two pieces of software communicate and exchange information.
For businesses with multiple tools — accounting software, a CRM, inventory management, scheduling platforms, and communication tools — integration eliminates the need to manually re-enter data between systems. Instead, a change in one application automatically triggers the appropriate update in all connected systems.
API development involves building, documenting, and maintaining these connections — either by leveraging existing third-party APIs or by creating custom APIs that expose your own data to other applications.
Well-integrated systems reduce errors, accelerate workflows, and give leadership a single, accurate view of business operations.
Why
Why Choose ACD?
Eliminate duplicate data entry
Data entered once flows automatically to every system that needs it. Your team spends less time on admin and more time on the work that matters.
One version of the truth
When all your systems are in sync, you always know your numbers are accurate — no more reconciling conflicting data from disconnected platforms.
Works with the tools you already use
We integrate with the platforms your team already relies on — QuickBooks, Slack, DocuSign, Twilio, MailChimp, and dozens more.
Let's talk about your project
Ready to build something great? Let’s start the conversation.