API Development & Integration
API development and integration is the connective layer between your systems and everything they need to talk to — payment gateways, third-party services, and other internal systems — built to stay reliable under real production traffic.
Overview
Most software today is not a single system in isolation — it depends on payment processors, messaging platforms, AI providers, and other internal systems, all connected through APIs. The quality of that connective layer determines whether the whole system is reliable or fragile.
We build both sides of this: REST and GraphQL APIs for systems we build ourselves, and integrations into third-party APIs — payment gateways, WhatsApp, AI providers, ERPs — with the error handling and monitoring that keeps a dependency on someone else's system from becoming your own outage.
Engineering
Real Engineering Behind Every API Development & Integration Engagement
API Development & Integration work here follows the same disciplined process as everything else Fastly builds — discovery, architecture decisions made deliberately, and code written for your specific system, not adapted from a generic starter.
Business Problems We Solve
Fragile Third-Party Integrations
An integration built without real error handling breaks the moment the third-party API changes or has an outage.
No Versioning Strategy
An API with no versioning plan breaks existing consumers the moment it needs to change.
Inconsistent Data Contracts
APIs without a clear, typed contract lead to silent mismatches between systems that surface as production bugs.
Poor Error Visibility
A failed integration with no real logging means the first sign of a problem is a customer complaint.
Features
REST and GraphQL API Design
APIs designed around real consumer needs, with clear versioning from the first release.
Resilient Third-Party Integration
Payment gateways, WhatsApp, AI providers, and ERPs integrated with real error handling and fallback logic.
Typed, Documented Contracts
Clear, typed API contracts that catch mismatches at build time, not in production.
Monitoring and Alerting
Real visibility into integration health, so a failure is caught before a customer notices.
Benefits
Integrations That Actually Hold Up
Built with the error handling to survive a third-party outage without becoming your outage.
Safe to Evolve
Versioned APIs mean you can change and grow without breaking existing consumers.
Faster Debugging
Real monitoring means problems are caught and diagnosed quickly, not discovered by a customer.
Connects Your Real Stack
Whatever systems your business already runs on, integrated properly rather than worked around.
Our Process
The same disciplined process behind every api development & integration engagement, from first conversation to production.
- 01
Discovery
Understanding your goals, users, and constraints before any code is written.
Technical Brief
- 02
Strategy
Defining the technical approach, architecture, and roadmap for what gets built.
Architecture Plan
- 03
Development
Building in focused iterations, with regular check-ins and working software at every stage.
Working Software
- 04
Launch & Growth
Shipping to production, then monitoring, refining, and scaling based on real usage.
Production Release
Technologies We Use
- Node.js
- GraphQL
- REST
- Stripe
- WhatsApp Business API
- PostgreSQL
Industries Served
Where api development & integration most commonly makes an impact.
- Finance
- Ecommerce
- Healthcare
- Logistics
Frequently Asked Questions
What third-party APIs have you integrated with?
Payment gateways, messaging platforms like WhatsApp, AI providers, and ERP/CRM systems are common — the specific integration depends on what your business already runs on, scoped honestly per project.
What happens if a third-party API changes or goes down?
Integrations are built with real error handling and fallback logic, so a third-party outage degrades gracefully instead of breaking your whole system.
Do you build the API or just integrate with existing ones?
Both — we design and build new REST/GraphQL APIs for systems we build, and integrate with existing third-party APIs when that is what the project needs.
How do you handle API versioning?
A versioning strategy is decided at the start, not after the first breaking change is needed, so existing consumers are not broken by future updates.
Can you document the API for our own developers?
Yes — clear, typed API documentation is a standard part of the deliverable, not an afterthought.
Related Services
Cloud & DevOps
AWS, Google Cloud, and Azure infrastructure, CI/CD pipelines, and monitoring built for reliable deployments and real production scale.
Learn More about Cloud & DevOpsSaaS Development
End-to-end SaaS platforms, including multi-tenant architecture, billing, and the infrastructure to scale from first customer onward.
Learn More about SaaS DevelopmentEnterprise Software Development
Internal tools and enterprise systems built to integrate with existing infrastructure and meet real compliance requirements.
Learn More about Enterprise Software Development
Delivery
Support Doesn't End At Launch
Every api development & integration engagement includes the Launch & Growth phase of our process — monitoring, refinement, and scaling support once the system is live, not a handoff the moment it ships.
Ready to Talk About API Development & Integration?
Tell us about your project and we'll get back to you with next steps — no obligation, no generic sales pitch.