API Development & Integration Sydney
Custom APIs and system integration for Sydney businesses.
We build custom APIs and connect your business systems. REST APIs for mobile apps and web portals. Integrations between your CRM, accounting, e-commerce, job management and payroll platforms. Webhooks, middleware and payment gateway connections.
Australian API developers. Fixed-price quotes. 18+ years experience.
Get a free consultation
Your systems don't talk to each other — we fix that
Sydney businesses typically run on five or six different platforms. Accounting in Xero or MYOB. Sales in a CRM. Orders through Shopify or a custom portal. Jobs in simPRO or ServiceM8. And someone on your team is the glue — manually copying data between them, exporting CSVs, chasing discrepancies.
That is what API development and integration solves. We build the connections so data flows automatically between your systems. Custom REST APIs when you need a backend for your app or portal. Third-party integrations when your accounting software needs to talk to your CRM. Webhooks and middleware when you need real-time sync with proper error handling.
HELLO PEOPLE is an Australian API development company with 18+ years experience building integrations for businesses across Sydney and nationally. We know the platforms, we know the APIs, and we give you a fixed-price quote before we start.
Problems Sydney businesses bring to us
These are the conversations we have every week.
Staff copying data between systems manually
Someone on your team exports from one system, reformats it, and imports into another. Every day. Invoices, contacts, orders, timesheets — all moving between platforms by hand.
Zapier and off-the-shelf connectors keep breaking
You tried the plug-and-play tools. They worked for simple stuff but cannot handle your specific data mapping, business rules, or the volume you need. When they fail, nobody knows until data is missing.
Need an API for your app but don't have a backend team
You have a mobile app idea or a web portal that needs a backend. User auth, data sync, payment processing — you need a proper REST API but do not have API developers on staff.
API Development Sydney
Tell us what systems you need connected
Describe the platforms, the data and the problem. We will come back with a practical integration plan and fixed-price quote.
API development and integration services for Sydney businesses
Custom APIs, system integrations, webhooks, middleware and payment connections.
Custom REST API development
We build RESTful APIs in Laravel, Node.js, .NET and Python. Clean resource-based endpoints, proper HTTP methods, consistent error responses, pagination, filtering and sorting.
Your mobile apps, React frontends, partner systems and internal tools all consume the same API. One backend, many consumers.
Authentication with JWT, API keys or OAuth 2.0. Rate limiting, input validation, CORS. OpenAPI/Swagger documentation included.
Third-party system integration
Connecting your business systems so data flows automatically. CRM to accounting. E-commerce to inventory. Website to ERP. Job management to payroll.
Xero, MYOB, Salesforce, HubSpot, Shopify, WooCommerce, Square, Stripe, simPRO, ServiceM8, Australia Post — we have built integrations for all of them.
Real-time sync via webhooks. Scheduled batch sync for systems without webhook support. Queue-based processing for high volumes. Error recovery and retry logic on every connection.
Webhook development and event-driven integrations
Real-time data flow between systems. When an invoice is created in Xero, your CRM updates. When a Shopify order comes in, your warehouse system queues it. When a form is submitted, your sales pipeline triggers.
We build webhook listeners that validate payloads, process data, handle retries and log everything. Reliable event-driven architecture, not fragile point-to-point scripts.
For systems that do not support webhooks natively, we build polling services with change detection.
API middleware and data transformation
When System A speaks a different language to System B, you need middleware. We build the translation layer — mapping fields, converting formats, applying business rules, enriching data.
Common scenario: your job management software needs data from your accounting system, but the data shapes are completely different. Our middleware handles the transformation so both systems stay clean.
Handles data validation, field mapping, format conversion (JSON, XML, CSV, EDI), and business logic in one manageable layer.
Payment gateway and financial integrations
Stripe, Square, PayWay, B2Bpay, Tyro, Windcave — we build payment integrations that process transactions securely and reconcile with your accounting software.
Invoice payment links, subscription billing, split payments, refund automation. Connected to your MYOB or Xero so every transaction reconciles automatically.
PCI compliance, tokenisation, and secure credential management built into every payment integration.
Connecting Shopify, Xero and a warehouse system — automating order fulfilment
A Sydney e-commerce business was manually processing orders from Shopify, creating invoices in Xero, and updating their warehouse system separately. We built API integrations that sync orders, inventory and invoices automatically across all three platforms.
Read the full case study →Orders used to take three systems and two people to process. HELLO PEOPLE connected Shopify, Xero and our warehouse platform with APIs — now orders flow through automatically. We handle three times the volume with the same team.
What you get from Australian API developers
Australian team, platforms we already know, fixed-price quotes, and integrations that run reliably.
Australian API developers who understand Sydney businesses
We are an Australian software company. When your API project needs fast iteration — data formats, edge cases, business rule changes — you deal with our team directly. No offshore relay.
Sydney moves fast. API integration projects need responsive communication and quick turnaround. You get that with us.
Built around the platforms Sydney businesses use
Xero, MYOB, Salesforce, HubSpot, Shopify, simPRO, ServiceM8, SharePoint — we have built integrations for most platforms Australian businesses rely on. We know their APIs, rate limits, and quirks.
Your API integration connects your actual systems with proper error handling, retry logic and monitoring. Not a prototype that falls over the first time a rate limit hits.
APIs designed for your business — not forced from a template
When off-the-shelf connectors do not fit, we build custom REST APIs from scratch. Clean endpoint design, proper authentication, versioning, documentation.
Your mobile app, web portal, partner systems and internal tools all consume the same reliable API. One source of truth, multiple consumers.
Integrations that run without you thinking about them
API integrations fail silently when built poorly. Ours include monitoring, alerting, error logging and automatic retries. If something breaks, we know before you do.
Queue-based processing for high-volume data. Webhook listeners that handle bursts. Scheduled sync for systems without real-time support. Built to run reliably at scale.
Your business data stays protected
Every API we build uses proper authentication — OAuth 2.0, API keys, JWT tokens — depending on the use case. Data encrypted in transit and at rest. Access controls and audit logging built in.
For Sydney businesses handling sensitive financial or customer data, we follow Australian data residency requirements and deploy within your infrastructure when needed.
How We Build Your API Integration
Every project follows this structure. The scope adapts, the discipline stays.
Why Sydney Businesses Choose HELLO PEOPLE for API Development
Australian team
Same timezone, direct communication, Australian support. We are a local company — not offshore behind an Australian phone number.
We know the platforms
Xero, MYOB, Salesforce, HubSpot, Shopify, simPRO, ServiceM8, Square, Stripe — we have built integrations for all of them. We know their APIs and their limitations.
Fixed-price quotes
Every project is scoped and quoted before we start. No hourly billing that creeps upward. You know exactly what you are paying.
18+ years experience
Building APIs and integrations for Australian businesses since 2007. We have seen every integration pattern and most of the edge cases that break them.
Monitoring included
Every integration includes error logging, alerting and automated retries. If something breaks, we know before you do.
Common questions about API development and integration in Sydney
What types of API development do you offer for Sydney businesses?
Custom REST API development, third-party system integration (Xero, MYOB, Salesforce, Shopify, etc.), webhook development, API middleware, payment gateway integration, and legacy system data migration. We build in Laravel, Node.js, .NET and Python.
How much does API development and integration cost?
A single integration (e.g., connecting your CRM to Xero) typically costs $5,000 to $15,000. A custom REST API for a mobile app or web portal ranges from $15,000 to $50,000+ depending on complexity. We scope every project with a fixed quote before starting.
Can you integrate our existing software with Xero or MYOB?
Yes — accounting integrations are one of our most common projects. We connect Xero and MYOB to CRMs, job management tools, e-commerce platforms, custom software and websites. Two-way sync, automatic invoice creation, payment reconciliation.
What if our system does not have an API?
We work with what you have. Direct database connections for legacy systems, file-based integration (CSV, XML) for older platforms, screen scraping as a last resort. If data exists in a system, we can usually get it out and into another system.
How long does an API integration project take?
A straightforward two-system integration takes 2 to 4 weeks. A custom API with multiple consumers takes 6 to 12 weeks. Complex multi-system integrations with middleware can take 8 to 16 weeks. Fortnightly demos throughout.
Do you build APIs for mobile apps?
Yes. We build backend REST APIs that mobile apps consume — user authentication, data sync, push notifications, file uploads, payment processing. The API serves both iOS and Android apps through one consistent interface.
What happens when an API integration breaks?
Every integration we build includes monitoring, error logging and automated retries. If a third-party API changes or a connection fails, our retry logic handles transient errors. Persistent issues trigger alerts — we fix them before they affect your operations.
Can you connect old Access databases or legacy systems?
Yes. We regularly connect legacy Access databases, old desktop applications and on-premise systems to modern cloud platforms. Direct database connections, file export processing, or full data migration — whatever makes the most sense for your situation.
API Integration Sydney
Ready to connect your systems?
Tell us what platforms you need integrated, what data needs to flow, and what's currently painful. We will give you a straight answer on scope and cost.
Talk To Our API Development Team
Tell us what systems you need connected or what API you need built. We will come back with a clear plan and fixed-price quote.
Prefer a quick chat? Call 0425 531 127 – we're Perth-based and we answer the phone.