API Development and Integration in San Diego

APIs are the connective tissue of modern software. They let your systems talk to each other, enable third-party integrations, and power the mobile apps and web applications your customers use.

As part of our San Diego software development services, we build APIs that are secure, reliable, and well-documented — whether you need a custom API from scratch, an integration between existing systems, or a public API for your platform.

What We Do

Custom API Development

We design and build RESTful and GraphQL APIs that serve as the backend for your applications. This includes:

• Data models and database design
• Authentication and authorization (OAuth, JWT, API keys)
• Rate limiting and throttling
• Error handling and logging
• Versioning strategy for long-term maintainability
• Comprehensive documentation

Third-Party Integrations

Your business probably uses multiple SaaS tools — CRM, accounting, email marketing, payment processing, shipping. We build integrations that connect these systems so data flows automatically instead of requiring manual entry.

Common integrations we build:

• Payment processing (Stripe, Square, PayPal)
• CRM systems (Salesforce, HubSpot)
• Accounting software (QuickBooks, Xero)
• Email platforms (Mailchimp, SendGrid)
• Shipping and logistics providers
• Calendar and scheduling tools
• Custom industry-specific platforms

API Modernization

If you have an existing API that's slow, poorly documented, or built on outdated technology, we can modernize it without disrupting your existing clients and integrations.

Our Approach

Design first. We define the API contract (endpoints, request/response formats, error codes) before writing any code. This ensures the API is intuitive and meets your requirements.

Security by default. Every API we build includes authentication, input validation, and protection against common vulnerabilities (injection, broken access control, etc.).

Documentation as a feature. A well-documented API is a usable API. We provide interactive API documentation (OpenAPI/Swagger) that developers can use to understand and test your endpoints.

Testing. Automated tests for every endpoint ensure reliability and make it safe to ship updates without breaking existing functionality.

Getting Started

If your San Diego business needs APIs built or systems connected, let's discuss your requirements.

Schedule a free consultation to discuss your API project.