Third-Party API Integration Development

Reliable integrations connecting your systems to the CRMs, ERPs, finance tools, and platforms your business depends on.

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Connecting Your Platforms

We design and build reliable integrations between your systems and the third-party platforms your business depends on. CRMs, ERPs, finance tools, communication platforms, marketing automation, analytics - if there is a business system you rely on, we can connect it to the rest of your technology stack.

Third-party integrations are rarely as straightforward as an API documentation page suggests. Handling authentication correctly, managing rate limits, dealing with inconsistent data, handling webhook delivery failures, and keeping integrations working when APIs change - these are the realities of production integration work.

Owen Jones, OLXR's founder and lead engineer, with extensive practical experience integrating the platforms UK businesses actually use.

Who This Is For

Businesses needing CRM, ERP, or finance systems to share data automatically
Development teams needing reliable integration built by an experienced engineer
Companies that tried generic integration tools and found them insufficient
Organisations needing multiple SaaS platforms to work as a coherent system
Businesses needing real-time data flow rather than batch updates
Businesses that need help choosing the right tools and services to suit their specific needs, not just connecting what they already have

What We Deliver

CRM Integrations

HubSpot, Salesforce, Pipedrive, and custom CRMs

Finance Integrations

Xero, QuickBooks, Sage, and other accounting platforms

Communication

SendGrid, Mailchimp, Twilio, Slack, Teams

Analytics & Marketing

Google Analytics, Meta API

Bidirectional Sync

Data flowing both directions, kept consistent

Webhook Handling

Reliable processing with error handling and retry

Authentication

OAuth flows, API key management, secure credentials

Rate Limit & Reliability

Queuing, retry logic, and rate limit management built in so third-party outages do not cause data loss

Our Approach

1
Understand the Data Model First

The most common source of integration problems is a mismatch between how two systems model the same concept. We map data models of both systems in detail, identify mismatches, and design a transformation layer. We also help identify the right tools and third-party services for your specific needs - not just connecting what you already have, but recommending platforms that will serve you better where the current ones do not.

2
Build for Production Reality

APIs go down. Rate limits are hit. Responses are malformed. We build integrations that handle these realities with queuing, retry, idempotency, and failure alerting.

3
Monitor and Maintain

Third-party integrations require ongoing attention. We provide monitoring and maintenance, proactively identifying issues and updating when APIs change.

Platforms We Commonly Integrate

Business Systems

HubSpot, Salesforce, Dynamics, Pipedrive

Finance

Xero, QuickBooks, Sage, NetSuite

Payments

Stripe, GoCardless, PayPal

Communication

SendGrid, Mailchimp, Twilio, Slack, Teams

Analytics

Google Analytics, Meta API, Google Ads

Cloud

AWS, Azure, Google Cloud

Don't see your platform? Get in touch.

Frequently Asked Questions

Straightforward integrations typically take 1-3 weeks. Complex bidirectional sync projects take 4-8 weeks.

Yes - data transformation between formats is core integration work.

We identify constraints during discovery and factor them into recommendations.

Related Services

Integrations

API integration and automation services
Payment Gateways

Secure payment gateway integrations
Data Sync

Data synchronisation and pipeline development

Ready to Connect Your Systems?

Tell us what you need to integrate. We'll give you an honest assessment.

Book a Free Consultation