Custom ERP & CRM Integration — We Connect the Systems Nobody Else Can
Your business runs on custom-built software. Or heavily customised off-the-shelf. It has no API. The vendor won't help. We build the integration layer and connect it to everything else.
Perth-based. Australia-wide. We specialise in systems others won't touch.
Your System Wasn't Built to Connect. We Fix That.
Someone built the ERP. Or the CRM. Or the job management system, the asset tracker, the client portal. It was built for your business, or heavily customised to fit. And it works — the business depends on it.
But it doesn't talk to Xero. It doesn't sync with your CRM. Reports come out as CSV exports. There's no API. The vendor either can't or won't help with integration. And replacing the system would mean losing years of customisation.
HELLO PEOPLE is a Perth-based software consultancy. We specialise in connecting custom and legacy systems to modern platforms. We build the integration layer your system was never designed with — so your data flows where it needs to, without replacing what works.
The reality of running on custom software
If your business depends on a system that nobody else can connect to, you probably recognise these.
No standard API to work with
Your system was built custom. Or it's an industry-specific ERP from a vendor who never prioritised integration. There's no API documentation, no webhook support, no Zapier connector. Just a database and maybe an export button.
The vendor won't help with integration
You asked the vendor about connecting to Xero or your CRM. They said "we don't support that" or quoted $200K for a custom connector. Or they simply stopped responding because the product is end-of-life.
Data re-entered across multiple systems
An order in the ERP gets re-typed into the accounting system. A customer update in the CRM doesn't reach the ERP. Staff maintain records in two or three places to keep everything in sync.
Heavily customised — can't be replaced easily
Your ERP or CRM has been customised over many years. Custom fields, custom workflows, custom reports. Moving to a standard platform would mean losing functionality your business depends on.
Built on old technology that's hard to extend
The system runs on .NET Framework, classic ASP, FoxPro, Progress 4GL, or some other technology that modern developers don't touch. Finding someone who can work on it is expensive and slow.
Locked into a vendor relationship
Only the vendor can make changes. They charge per hour. They control the timeline. You can't get your data out easily. And switching means starting from scratch.
Get Started
Tell us about the system
What does it do? What's it built on? What systems does it need to talk to? Share the details and we'll assess it.
Custom System Integration Solutions
API builds, cloud sync, middleware, data extraction and gradual modernisation. Here is what we deliver.
Custom API development for legacy systems
We reverse-engineer your system's database, understand the business rules and build a secure REST API on top. Authentication, rate limiting, field-level access control and documentation included.
Works even when the vendor provides no API. We work at the database level, respecting the application's data integrity rules.
For businesses whose custom system has no API and no integration options from the vendor.
Custom system to cloud platform sync
Your custom ERP or CRM syncing with Xero, MYOB, Salesforce, HubSpot, Shopify or any cloud platform. Bidirectional where needed — changes in either system flow to the other.
We handle the complexity: data mapping between different schemas, conflict resolution for bidirectional sync, and error handling for records that don't match.
For businesses that need their custom system data in cloud software their team uses daily.
Integration middleware and message bus
For complex environments with multiple systems that all need to share data. We build a central middleware layer that routes data between systems, transforms formats, handles errors and provides a single monitoring dashboard.
Event-driven architecture. Systems publish events. Subscribers receive what they need. New systems plug in without changing existing ones.
For businesses with three or more systems that need to share data reliably.
Data liberation from locked-in systems
Your data, out of the system, into a format you own. Regular exports to your data warehouse, reporting database or cloud storage. You're no longer dependent on the vendor for access to your own data.
Automated, scheduled, with full audit trails. Historical data extracted and ongoing changes captured incrementally.
For businesses where the vendor controls data access and you need independence.
Gradual system modernisation
Replace one module at a time. Keep the custom system running for what it does well. Build modern replacements for the parts that are holding you back. The integration layer bridges old and new.
Strangler fig pattern — modern modules gradually take over functionality from the legacy system. No big-bang migration risk.
For businesses whose system is too large and complex to replace in one go.
Ongoing legacy system support
Bug fixes, performance tuning, small enhancements and security patches for your custom system. We become the support team that the original developer isn't available to be.
We learn the system, document it, stabilise it and keep it running while you plan the long-term strategy.
For businesses whose system is critical but the original developer or vendor has moved on.
Your custom system talks to everything else
We build the integration layer your system was never designed with. Your ERP talks to Xero. Your CRM syncs with HubSpot. Your internal system pushes data to Shopify. Whatever the combination, we make it work.
The custom system stays as it is. The integration handles the data flow.
A proper API on your legacy system
We build a REST API that sits on top of your custom database. Documented, authenticated, rate-limited. Any modern system can now connect to your ERP/CRM without touching the database directly.
Your vendor may not provide an API. We build one anyway, by understanding the data model and business rules.
How we price custom integrations
Every custom system is different. We scope after discovery — never before.
Free discovery call
Tell us about the system — what it does, what it's built on, what needs to connect. We'll assess complexity and give you a realistic range.
Fixed-price quote
After reviewing the system architecture and data model, we quote a fixed price for the integration or API build. No hourly creep.
Ongoing support
Monthly plans for integration monitoring, legacy system maintenance and evolution. Your systems looked after properly.
AI-powered document processing that cut manual work by 85%
We helped an Australian firm replace hours of manual data entry with an intelligent processing pipeline. Invoices, claims, and supporting documents now flow straight into their systems — accurately and automatically.
Read the full case study →Your custom system integration at a glance
Your custom or legacy system at the centre. API layer, middleware and sync connecting it to the modern platforms your business needs.
From discovery to connected and monitored
Every custom system is different. The process adapts, but the structure stays the same.
Why HELLO PEOPLE for integrations
We build, not just connect
We write proper integration code — API connections, data mapping, error handling, logging. Not Zapier chains that break quietly.
Fixed-price quoting
You get a clear price before we start. No hourly billing that spirals. No surprise invoices at the end of the month.
Built for Australian business
We understand BAS, GST, super, award rates, Australian privacy law, and the platforms local businesses actually use.
Senior team, direct access
You talk to the people building your integration. No account managers, no offshore handoffs, no ticket queues.
Ongoing support included
APIs change. Platforms update. We monitor, maintain, and evolve your integration so it keeps working as your business grows.
We had a custom ERP built fifteen years ago. No API, no documentation, the original developer retired. HELLO PEOPLE reverse-engineered the database, built an API, and connected it to Xero and our new CRM. We didn't have to replace the ERP — it just works with everything now.
Custom systems we've connected
Every industry has its own custom and legacy systems. The business logic inside them is irreplaceable — the integration just connects them to the rest of the world.
Manufacturing
Custom ERP for production scheduling, BOM management and quality tracking. We connect it to accounting, warehouse management and eCommerce without replacing the system your factory depends on.
Logistics & Transport
Custom dispatch, routing and fleet management systems. We connect them to customer portals, accounting and real-time tracking platforms.
Mining & Resources
Asset management, maintenance scheduling and compliance systems built for specific operations. We integrate with SAP, financial reporting and safety compliance platforms.
Healthcare & Aged Care
Custom patient management, rostering and billing systems. We connect them to Medicare, accounting, HR platforms and government reporting systems.
Government & Utilities
Legacy systems for asset management, citizen services, billing and compliance. We connect them to modern portals, payment gateways and reporting platforms.
Professional Services
Custom practice management, time tracking and client billing systems. We connect them to accounting, document management and CRM platforms.
Common questions about custom system integration
Our system has no API. Can you still integrate it?
Yes. We work at the database level — reading and writing data directly using the system's data model and business rules. Or we use file-based integration (the system exports, we pick it up). Where possible, we build an API on top so future integrations are easier.
We don't have the source code. Is that a problem?
Not necessarily. We can work with the database directly and build integration at that level. If we need to modify the application logic, it gets harder without source code — but database-level and file-level integration usually covers what's needed.
How much does custom system integration cost?
Basic sync between a custom system and one cloud platform typically costs $10,000 to $25,000. Custom API development runs $15,000 to $40,000. Full middleware layers with multiple systems range $25,000 to $80,000+. Depends entirely on the system complexity and the number of entities to integrate.
Can you also support and maintain our legacy system?
Yes. If the original developer or vendor is gone, we take over support. Bug fixes, performance tuning, security patches and small enhancements. We learn the system, document it and keep it stable.
Should we just replace the system instead?
Sometimes, yes. But often the system does 80% of what you need and replacing it is a massive project with significant risk. Integration lets you keep the 80% and fill the gaps with modern tools. We'll give you an honest assessment of which path makes more sense.
What if our system is on very old technology?
We've worked with .NET Framework, classic ASP, FoxPro, Progress 4GL, Delphi, VB6 and systems built on technologies most developers haven't heard of. The database is usually more accessible than the application, and that's where integration happens.
Will the integration break if the vendor updates the system?
We design integration to be resilient. Database-level integrations monitor for schema changes. API-level integrations use versioning. We include alerting so you know immediately if something changes. Most vendor updates don't break the integration.
How long does a custom system integration take?
A single-system sync takes 6 to 10 weeks. API layer builds take 8 to 14 weeks. Full middleware environments take 12 to 20 weeks. We scope precisely after the discovery phase — custom systems vary widely in complexity.
Get Started
Tell us about the system
What it does, what it's built on, and what needs to connect. We'll tell you what's possible and what it costs.
Tell Us About Your System
What does it do? What's it built on? What cloud tools does it need to connect to? Share the details and we'll assess the integration options.
Prefer a quick chat? Call 0425 531 127 – we're Perth-based and we answer the phone.