API & Integration Development
Integrations That Don't Break at 3AM
REST APIs, webhook systems, data synchronization, and third-party connectors — built with retry logic, proper error handling, and documentation.
Free quote within 24 hours · No commitment
Architecture
How I Design Integration Architecture
Client
Your Application
Integration Layer
API Layer
Services
Common Integrations
Platforms and services I integrate with regularly.
Salesforce
CRM data sync, lead management, custom object mapping
HubSpot
Contact sync, deal pipelines, marketing automation hooks
Stripe
Payment processing, subscription management, webhook handlers
Mailchimp / SendGrid
Email list sync, transactional emails, campaign triggers
Zapier
Custom Zap integrations, webhook receivers, multi-step automations
Twilio
SMS notifications, voice, WhatsApp Business API
Shopify API
Product sync, order management, inventory webhooks
Custom / Internal
Your existing APIs, databases, and internal systems
Methodology
How I Build Integrations
API Design & Documentation
OpenAPI 3.0 specs, versioned endpoints, consistent error response formats. Every API I build comes with interactive documentation and example requests.
Authentication & Security
OAuth 2.0 flows, JWT token management, API key rotation, encrypted transport. I implement the auth pattern that fits your security requirements.
Error Handling & Retries
Exponential backoff, dead letter queues, circuit breakers, and alerting. When a third-party service goes down, your integration degrades gracefully instead of failing silently.
Monitoring & Observability
Structured logging, request tracing, health check endpoints, and dashboards. You see exactly what’s happening in your integrations at all times.
Integration Work
Recent Integration Projects
B2B Procurement Workflow
Connected a WooCommerce storefront to supplier inventory APIs with real-time stock sync, automated reordering, and trade account pricing for ChoiceOne Suppliers.
Travel Booking Integration
Built booking and availability APIs for Vacavia’s vacation rental platform, connecting property management systems with the customer-facing search and reservation flow.
Multi-Store Payment Processing
Implemented Stripe and PayPal integrations across 5+ eCommerce stores with unified webhook handling, refund automation, and PCI-compliant tokenization.
What I Deliver
Clear deliverables, no surprises.
REST API Development
Custom API endpoints with authentication, rate limiting, pagination, and versioning. Every API ships with OpenAPI documentation, a Postman collection, and integration test suites.
Third-Party Integrations
I connect your application to CRMs, payment processors, email platforms, shipping services, and custom internal systems. Each integration includes error handling, retry logic, and monitoring.
Data Synchronization
Real-time or scheduled sync between your application and external systems. Conflict resolution, delta sync, and audit logging built in.
Webhook Systems
Event-driven architectures with reliable webhook delivery, signature verification, retry with backoff, and dead letter handling for failed deliveries.
How I Work
How We Work Together
Requirements Mapping
We define the integration scope — which systems, what data flows, error handling requirements, and SLAs.
Architecture & Design
I design the integration architecture, document API contracts, and identify failure modes before writing code.
Build & Test
Incremental builds with integration tests against real sandbox APIs. Every error path tested, load tested, and monitored.
Deploy & Monitor
Production deployment with observability from day one — request logging, health checks, alerting, and dashboards.
Reviews
What Clients Say
Real reviews from Upwork and Trustpilot
“Hired Adrian on a tight deadline and he handled it like a pro. I gave him a punch list and he knocked it out item by item, acknowledging each task and communicating every delivery along the way. That kind of transparency is rare and honestly made the whole process stress-free. He covered everything, WordPress, Elementor, custom code, bug fixes, and the work came out clean and polished. Knows his stuff, doesn't overcomplicate things, and you never have to chase him down for updates. Would 100% work with him again.”
“Adrian KICK-ASS. Very competent and hard worker”
“Always reliable, professional and great communication skills.”
“Adrian is highly recommended as he works hard and delivers. His credo quality above speed, was one of the most important factors for hiring him. I would hire him again. (and he is a really nice guy!)”
“Adrian has been very accommodating. When hiccups came up Adrian took the trouble to look into it and settled them. I would recommend him for your jobs.”
“He is the best.”
Frequently Asked Questions
Any REST or GraphQL API. Common integrations include CRMs, payment processors, shipping services, email platforms, and custom internal systems.
Yes — I design and build RESTful APIs with authentication, rate limiting, documentation, and proper error handling.
OAuth 2.0, API keys, JWT tokens, and encrypted communication. All integrations follow security best practices.
I build integration layers with versioning and abstraction so API changes don’t break your application.
Have an Integration Challenge? Let's Solve It.
Free quote within 24 hours · No commitment
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