API Development: Secure, Scalable & Well-Documented APIs
APIs connect your apps, partners, devices and AI agents. We design and build REST, GraphQL and gRPC APIs that are fast, secure, versioned and easy for developers to use.
APIs are the backbone of modern software
Every mobile app, web platform, SaaS integration and AI agent depends on APIs. A poorly designed API slows teams down, leaks data and breaks integrations. A well-designed one becomes a product that partners and customers want to build on.
ENGIMANDI follows an API-first approach. We agree the contract (OpenAPI or GraphQL schema) with you before coding, then build with strong authentication, input validation, rate limiting, caching, logging and automated tests. You get interactive documentation and client SDKs if needed.
What you get
- API design & OpenAPI 3 specification
- REST, GraphQL, gRPC & WebSockets
- OAuth 2.0, JWT, API keys & SSO
- Rate limiting, caching & pagination
- Webhooks & event-driven APIs
- Interactive docs (Swagger / Redoc)
- Automated tests & monitoring
- Versioning and backward compatibility
API services
Build new APIs, connect existing systems or open your platform to partners.
Custom API Development
Backend APIs for your mobile apps, web apps, SaaS products and IoT devices.
Third-Party Integrations
Payment gateways, SMS, WhatsApp Business, CRM, ERP, logistics and accounting APIs.
Public & Partner APIs
Developer portals, API keys, usage plans and documentation for external developers.
Microservices
Break monoliths into well-bounded services with gRPC, message queues and API gateways.
CAD & Engineering APIs
Expose CAD data, BOMs and drawing generation as APIs using Autodesk Platform Services and custom engines.
API tech stack
Battle-tested frameworks and infrastructure.
Typical projects
- Backend API for Android, iOS and web apps
- ERP integration API for a dealer portal
- Payment and invoicing API with GST compliance
- Public API and developer portal for a SaaS
- IoT telemetry API for connected machines
- API that generates CAD drawings from order data
API-first delivery
Model
Resources, data model, consumers and security rules.
Specify
OpenAPI / GraphQL contract reviewed with you.
Implement
Clean, tested code with CI pipelines.
Secure
Pen-test checks, OWASP API Top 10 review.
Operate
Deploy, monitor, scale and version safely.
API development questions
REST or GraphQL: which should I choose?
REST is simple, cache-friendly and universal. GraphQL is great when clients need flexible queries across many related objects. Many systems use both. We recommend based on your consumers.
How do you secure APIs?
OAuth 2.0 / OpenID Connect, JWTs, API keys, scopes, input validation, rate limiting, encryption in transit and at rest, audit logs and regular security reviews.
Can you document an existing API?
Yes. We can reverse-engineer and document existing APIs in OpenAPI format, add tests and generate client SDKs.
Do you host and maintain the API?
We can deploy to your AWS, Azure, GCP or VPS account and provide monitoring and maintenance plans.