I design and develop secure REST APIs, backend services, and third-party integrations for web, mobile, and business applications.

Whether you need a new backend, an integration with an external platform, or improvements to an existing API, I can help you build a reliable foundation that supports your product and business processes.

REST APIs for web and mobile applications

Backend services and business logic

Authentication with JWT and role-based permissions

User, customer, product, order, and transaction modules

PostgreSQL and MySQL database integration

Third-party API and external service integrations

File and document management workflows

Payment, messaging, cloud, and business platform integrations

API validation, error handling, and logging

Swagger and OpenAPI documentation

Existing API improvements and modernization

Docker and cloud deployment configuration

I develop backend solutions using NestJS, Node.js, Java Spring Boot, Python FastAPI, PostgreSQL, MySQL, Docker, AWS, Azure, Supabase, and other modern tools.

The final technology stack is selected according to your existing system, requirements, expected traffic, integrations, infrastructure, and long-term maintenance needs.

Requirements and existing system analysis

API scope and integration definition

Database and endpoint design

Incremental implementation and testing

Documentation and integration support

Deployment, handoff, and final review

Each API is designed with clear responsibilities, structured error handling, validation, maintainable code, and appropriate security controls.

Use the calendar link on this service to book a 45-minute project consultation. During the meeting, we can review your application, required endpoints, existing infrastructure, third-party services, expected timeline, and the most suitable integration approach.