Your tools should talk to each other. We make them fluent
API integrations, platform connections, custom middleware, and data flow optimization — we connect your tools so your team can stop being the middleware.
Your CRM doesn't sync with your email platform. Your booking system doesn't update your contacts. Your payment processor doesn't trigger onboarding. Every gap between your tools is a job someone does by hand, or forgets to do.
The hidden cost of disconnected tools
Most businesses run on a stack of tools that were never designed to work together. The data lives in five places, and the workarounds are held together by spreadsheets and memory. Someone spends hours every week copying information between platforms. When they miss a step, a lead goes cold, an invoice goes unpaid, or a customer gets the wrong email.
What we connect
CRM and email: HubSpot, Brevo, Salesforce, Wix Contacts
Payments: Stripe, Wix Payments
Scheduling: Calendly, Wix Bookings
Analytics and tracking: GA4, Google Tag Manager (including server-side), Meta Pixel
Consent: Usercentrics
Automation: Zapier, Make
Custom APIs: if your tool has an endpoint, we can connect it. If it doesn't, we'll find the workaround.
How we build it
REST and GraphQL API integrations
Custom middleware and data sync between platforms
Webhooks that trigger the right action the moment something happens
Secure authentication with OAuth 2.0 and encrypted data transfer
Architecture that holds up as your volume grows
Logging and alerts, so you know the moment a connection breaks
What it looks like in practice
A booking in Calendly creates the contact, tags it, and starts the right email sequence.
A payment in Stripe triggers onboarding, the receipt and the CRM update.
A form fill reaches sales in seconds, with the page and campaign it came from.
Email replies route to the right person, and every click traces back to the email that sent it.
We fix other people's integrations too
Data not syncing, automations misfiring, duplicate contacts, broken webhooks, tracking that counts the same sale twice. We find the cause, fix it, and document it so it stays fixed.
When off-the-shelf isn't enough
Some workflows outgrow Zapier. For those, we build custom back ends and internal software that connect everything in one place. See Custom ERP & Internal Software.
The goal isn't more tools. It's fewer manual tasks, cleaner data, and a business that runs the way you always assumed it did.
Blog
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Faq
What tools do you integrate?
CRMs (HubSpot, Wix Contacts, Brevo, Salesforce), payments (Stripe, Wix Payments), scheduling (Calendly, Wix Bookings), analytics (GA4, GTM, server-side GTM), advertising (Meta Pixel), consent (Usercentrics), automation (Zapier, Make), custom APIs, and many more.
Can you fix integrations someone else set up?
Yes. We audit what's connected, find where data is lost or duplicated, and fix it. You get a short document explaining what each connection does, so the next person isn't guessing.
What's middleware, and do I need it?
Middleware is a small piece of software that sits between two tools and translates between them. You need it when two systems can't connect directly, when data has to be cleaned or reshaped on the way, or when one event needs to update several tools at once.
Should we use Zapier or Make, or build something custom?
Zapier and Make are perfect for simple, low-volume workflows. Custom code makes sense when volume is high, when the logic is complex, or when per-task fees start adding up. We'll tell you which one fits, and we're happy to use the cheaper option.
How do you handle security?
We use OAuth 2.0 wherever a platform supports it, encrypt data in transit, store keys in secure secrets managers instead of in code, and give each connection only the access it needs.
What happens if a connection breaks?
We build in logging and alerts, so failures are caught right away instead of weeks later. Ongoing monitoring and maintenance are available.
Does this help with tracking and ad performance?
Yes. Server-side tagging with GTM and properly connected Meta Pixel and GA4 events give you more accurate conversion data, and they respect your visitors' consent choices.
Testimonials
Ralph
25/05/2025
Until working with Illustrated Domain I have had average at best experience. Sarah and her team raised the bar.
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