API development and integration
Building clean APIs, and connecting your applications to other systems through well-defined, documented interfaces.
RESTOpenAPIVersioning
System
integration
I make different software systems and applications work together seamlessly, through API development and integration, and by connecting the third-party services your business relies on.
Software is stronger
when it works together.
Most businesses run on many tools: a website, a payment provider, accounting software, a CRM. When those tools do not talk to each other, people end up copying data by hand and making mistakes.
I connect them so information flows automatically, reliably, and securely, and so a problem in one system does not bring down the rest.
What I connect
From a single payment gateway to a network of systems that all need to share the same data.
Third-party services
Adding payments, messaging, maps, and other external services to your product, and handling their quirks properly.
PaymentsMessagingMaps
Data synchronisation
Keeping data consistent across systems, whether it moves in real time or in scheduled batches.
Sync jobsData mappingMigration
Authentication and access
Secure connections between systems using API keys, tokens, and OAuth, with permissions limited to what is needed.
OAuth 2.0JWTAPI keys
Legacy system connection
Linking older systems to modern applications without a risky full rewrite, using adapters and clear boundaries.
AdaptersFile exchangeDatabase links
Monitoring and error handling
Retries, logging, and alerts, so a failing connection is noticed and handled before your users notice it.
RetriesLoggingAlerts
Four ways
systems connect
Choosing the right pattern matters more than the tools. Select one to see how it works and when I use it.
Your app
REST API
Other service
Request goes out, response comes back immediately.
How it works
One system sends a request and the other answers straight away. It is the most common way for applications to talk to each other.
Best for
Looking up information and triggering actions in real time, such as fetching an order or creating a customer.
What I watch for
Rate limitsTimeoutsAPI versioning
Third-party services
I work with
Examples of what I connect most often. If a service has an API, I can most likely integrate it.
Payments
StripePayPalPayHere
Sign-in and identity
OAuth 2.0Google sign-inJWT
Messaging
TwilioSendGridWhatsApp Business
Maps and location
Google MapsMapbox
Cloud and storage
AWS S3FirebaseCloudinary
Business tools
CRM systemsERP systemsGoogle Workspace
What makes an
integration last
Reliable
Automatic retries and safe handling of duplicates, so one failed request does not become a lost order.
Secure
Keys and tokens kept out of code, every input validated, and access limited to what each system needs.
Documented
Every connection is written down, so your team understands how the pieces fit together.
Observable
Logs and alerts show what is flowing between systems and where something goes wrong.
How I
approach it
- 01
Map
List the systems involved, the data they hold, and what needs to flow between them.
- 02
Design
Choose the integration pattern and agree the data formats and error rules.
- 03
Build
Develop the connections, transformations, and authentication.
- 04
Test
Check normal flows, edge cases, failures, and heavy traffic.
- 05
Deploy
Release safely, with secrets managed and rollbacks ready.
- 06
Monitor
Watch the connections, fix issues early, and adapt as the systems change.
What you
receive
Connections that work today, and the documentation to keep them working tomorrow.
- Working, tested connections between your systems
- API documentation, including request and response examples
- Retry, timeout, and error-handling logic
- Automated tests for the integration points
- Logging and alerts for failed connections
- A handover guide for your team
Common
questions
Something else on your mind? Send me a message and I will reply personally.
Often, yes. Depending on the system, I can use file exchange, a database-level connection, or a small adapter that wraps the old system in a modern API. I will suggest the safest option for your situation.
The integration is designed for it. Requests are retried, work is queued where possible, and your application shows a sensible message instead of breaking. You are alerted so the issue does not go unnoticed.
Secrets are stored in environment configuration rather than in code, connections use encryption, and each system only gets the permissions it actually needs. Incoming data is always validated.
Yes. I can design and build your own API from scratch, document it, and then integrate it with your other systems.
A single well-documented service, such as a payment gateway, can take a few days. Connecting several systems, or older ones with poor documentation, takes longer. I will give you a realistic estimate after reviewing the systems involved.
Let's get your systems talking.
Tell me which systems or services you need to connect, and I will suggest the best way to do it.