You will get Design and Implementation of Scalable REST APIs (Spring Boot or Nest.js)
Project details
Do you need a solid, scalable, and well-structured backend API for your application or product?
I’m a Senior Software Engineer with 8+ years of experience building backend systems for retail, banking, and digital products, and I can help you design and implement a clean, maintainable backend foundation from scratch.
🔧 What this service includes
REST API design based on best practices
Implementation using Java (Spring Boot) or Node.js (NestJS)
Endpoint definition, DTOs, and validations
Database integration (SQL or NoSQL)
Error handling and clean project structure
Basic API documentation
🧠 How I work
I analyze your functional requirements
I propose a backend architecture tailored to your needs
I implement the service with a strong focus on scalability, maintainability, and clarity
I deliver clean, production-ready code
✅ Ideal for
Startups and early-stage products
Teams that need a reliable backend foundation
MVPs that need to scale later
❌ Not a good fit for
Undefined or constantly changing requirements
Pure frontend or UI/UX work
Very small bug-fix–only tasks
If you’re unsure about the scope, feel free to message me before purchasing — I’m happy to clarify.
I’m a Senior Software Engineer with 8+ years of experience building backend systems for retail, banking, and digital products, and I can help you design and implement a clean, maintainable backend foundation from scratch.
🔧 What this service includes
REST API design based on best practices
Implementation using Java (Spring Boot) or Node.js (NestJS)
Endpoint definition, DTOs, and validations
Database integration (SQL or NoSQL)
Error handling and clean project structure
Basic API documentation
🧠 How I work
I analyze your functional requirements
I propose a backend architecture tailored to your needs
I implement the service with a strong focus on scalability, maintainability, and clarity
I deliver clean, production-ready code
✅ Ideal for
Startups and early-stage products
Teams that need a reliable backend foundation
MVPs that need to scale later
❌ Not a good fit for
Undefined or constantly changing requirements
Pure frontend or UI/UX work
Very small bug-fix–only tasks
If you’re unsure about the scope, feel free to message me before purchasing — I’m happy to clarify.
Programming Languages
JavaScript, JavaWhat's included
| Service Tiers |
Starter
$250
|
Standard
$500
|
Advanced
$1,000
|
|---|---|---|---|
| Delivery Time | 4 days | 6 days | 9 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
About Leonel
Full-Stack Web Developer | Tech Lead | Software Architect | JavaScript
Purranque, Chile - 5:52 pm local time
tecnologías de la información, con amplios conocimientos en
múltiples tecnologías y herramientas de desarrollo que incluyen
NodeJS con IONIC, Angular y NestJS y Java con Spring Boot.
Además, me destaco en la administración de DevOps con la
creación de pipelines de CI y CD para automatizar e integrar
múltiples herramientas, tecnologías y plataformas en la nube, como
Azure, AWS y GCP.
Siempre enfocado en el uso de contenedores y su desarrollo
derivado con el uso de Dockers, Kubernetes y Terraform.
Steps for completing your project
After purchasing the project, send requirements so Leonel can start the project.
Delivery time starts when Leonel receives requirements from you.
Leonel works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements & Scope Definition
We review your business goals, core use cases, preferred tech stack, and constraints. This step ensures a clear scope and avoids misunderstandings before development starts.
Backend Architecture Design
I design the backend architecture, define REST endpoints, data models, and validation rules following best practices for scalability, maintainability, and performance.