# API development company | REST, GraphQL, LLM

> APIs that connect your product, third-party tools, AI models and internal data. REST, GraphQL and gRPC with clear documentation and versioning. Free call.

Source: https://codeintelli.com/services/api-development

Your systems don't talk to each other. Your team is the copy and paste in between.

We design and build APIs and integrations that connect your apps, partners and data, documented, secured and versioned so they keep working as you grow.

## Problems we solve

- Our team retypes data from one system into another: Orders, invoices and customer details, by hand, all day.
- Partners want to integrate and we have no API: Deals stall while you promise it's coming soon.
- Our API breaks clients every time we change it: No versioning, so every update means angry partner emails.
- Nobody knows how the API works: The documentation is out of date or doesn't exist.

## What we build

- API design: REST, GraphQL or gRPC designed around how your consumers use it
- Third-party integrations: Payments, CRM, ERP, shipping and messaging connected to your apps
- Developer docs: OpenAPI and Swagger docs with examples, kept in sync with the code
- Security and limits: OAuth 2.0, JWT, rate limits and gateways like Kong or AWS API Gateway

## How we work

- Design (1-2 weeks): We map the data and actions each consumer needs and write the API specification with you.
- Build (4-8 weeks): We build the API with tests, authentication and rate limits, and demo it every week.
- Document (2-3 weeks): We publish interactive docs, example requests and guides your partners can follow on their own.
- Operate (Ongoing): We monitor usage, errors and response times, and manage new versions as needs change.

## Results

- Coding Assistant Platform, Austin: Developer coding-assistant platform built as microservices. The client reports $2M+ ARR within 2 years.
- Growfone: Our own AI business phone: calls, WhatsApp, SMS and AI follow-ups in one place. Live product.
- Delivery Manager: Fleet app that works offline, sends GPS every 15 seconds, and handles driver shifts and expense receipts. Built with Flutter, Firebase, Node.js and PostgreSQL.

## Technologies

REST, GraphQL, gRPC, OpenAPI, Swagger, Kong, AWS API Gateway, Apigee, Postman, OAuth 2.0, JWT, Node.js, FastAPI

## Questions

### REST or GraphQL?
It depends on who uses it. REST suits most partner and public APIs. GraphQL suits apps that need flexible data. We'll recommend one during design and explain why.

### Can you connect to our old systems?
Yes. We build integration layers over older databases, SOAP services and file exports, so new apps can use them without changing the old system.

### How do you keep the API secure?
OAuth 2.0 or API keys, encryption, rate limits, input validation and audit logs. We sign an NDA before you share anything.

### What will it cost?
After a free 30-minute call you get a written plan and fixed price within 48 hours. You own all the code and documentation.

## Contact

- Email: biz@codeintelli.com
- Phone / WhatsApp: +91 92745 85376
- Book a free 30-minute call: https://codeintelli.com/book-a-call