---
title: "Backend and API Development Services"
description: "Backend and API development: REST and GraphQL APIs, business logic, databases, background jobs and event-driven systems in Java, Go, Python and Node.js."
url: "https://codesagelabs.com/services/backend-and-api-development"
type: "service"
provider: "Code Sage Labs"
area_served: "Worldwide, from Colombo, Sri Lanka"
---

# Backend and API development

We build the systems behind the interface: REST and GraphQL APIs, business logic, data models, background jobs and event-driven services. Our engineers in Sri Lanka work in Java and Spring Boot, Go, Python and Node.js, and design backends to be understood, tested and changed by whoever maintains them next.

## What this service is

The systems behind the interface: APIs, business logic, data models, background jobs and the services that keep everything consistent. We design backends to be understood, tested and changed by whoever maintains them next.

## What we build

- REST and GraphQL APIs
- Business logic, workflows and approvals
- Database design and migrations
- Background jobs, queues and event-driven systems
- Authentication, permissions and audit trails

## Typical projects

- An order and dispatch API shared by a web app, a mobile app and a partner integration
- A workflow service that moves documents through review and approval steps
- A reporting service that aggregates data from several systems on a schedule

## Technologies

- Java
- Spring Boot
- Go
- Python
- Node.js
- PostgreSQL
- MongoDB
- Kafka

## Also searched as

- API development services
- backend development company
- Spring Boot development
- microservices development
- database design

## Questions

### Which backend languages and frameworks do you use?

Java with Spring Boot, Go, Python and Node.js, with PostgreSQL or MongoDB for data and Kafka or a queue where work needs to happen in the background. We choose based on the problem and on what your team can maintain.

### Can you add an API to a system we already have?

Yes. We can design an API in front of an existing system so a new web app, mobile app or partner can use it without rewriting what already works.

### Do you write tests and documentation?

Yes. APIs come with automated tests and written documentation, so another engineer can pick the work up without us in the room.

## Related

- [All services](https://codesagelabs.com/services)
- [Web and mobile app development](https://codesagelabs.com/services/web-and-mobile-app-development)
- [System integration and API integration](https://codesagelabs.com/services/system-integration)
- [AI development and AI integration](https://codesagelabs.com/services/ai-development)
- [Cloud and DevOps services](https://codesagelabs.com/services/cloud-and-devops)
- [Software maintenance and modernisation](https://codesagelabs.com/services/software-modernisation)
- [Start a project](https://codesagelabs.com/contact)

*Source: [https://codesagelabs.com/services/backend-and-api-development](https://codesagelabs.com/services/backend-and-api-development) — Code Sage Labs, Colombo, Sri Lanka. Contact: hello@codesagelabs.com*