I will develop a robust java spring boot backend API

H
hernanmaradona
H
hernanmaradona
Hernan M
develop a robust java spring boot backend API
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develop a robust java spring boot backend API

About this gig

Are you looking for a robust, secure, and scalable backend for your application?

Hello! I am a professional Backend Developer specializing in the Java ecosystem. I build clean, efficient, and production-ready RESTful APIs using Spring Boot.

I bring hands-on experience developing mission-critical systems, from processing complex market data and digital invoicing platforms to integrating AI for automated data extraction (like receipt/ticket scanning). Whether you need a quick bug fix or a complete backend architecture, I can help you.

My Tech Stack & Expertise:

  • Languages: Java (11, 17, 21)
  • Framework: Spring Boot, Spring Security, Spring Data
  • Databases: SQL (PostgreSQL/MySQL) & NoSQL (MongoDB)
  • Advanced Integrations: Artificial Intelligence (OpenAI, OCR), Supabase
  • Mobile-Ready: Backend development optimized for Flutter & React Native apps.

What I can do for you:

  • Develop custom REST APIs from scratch.
  • Fix bugs or refactor existing Java/Spring Boot code.
  • Integrate third-party APIs and payment gateways.
  • Implement secure JWT Authentication.
  • Optimize database queries and fix logic errors (e.g., balance calculation algorithms).

Please message me before placing an order so we can discuss yo

  • Programming language

    • JavaScript

  • Expertise

    • Debugging
    • Performance
    • Security
    • Design
    • Databases

  • Frontend framework

    • Angular
    • Next.js
    • React.js

  • Backend framework

    • Next.js
    • Node.js
    • Spring

  • AI & low/no code builders

    • Base44

Get to know Hernan M

Hernan M

Backend Developer Java Spring Boot Microservicios Fintech

  • FromArgentina
  • Member sinceMay 2023
  • Avg. response time1 hour

  • Languages

    English, Spanish
Desarrollador Backend con más de 4 años de experiencia en Java, Spring Boot y microservicios en entornos de alta disponibilidad. Especializado en construcción de APIs REST, refactorización de código legacy, integración con servicios cloud (AWS) y mejora continua de sistemas. Experiencia en entornos fintech y adtech, con sólido manejo de Clean Architecture, principios SOLID, seguridad con JWT/Keycloak y bases de datos SQL/NoSQL. Orientado a la calidad del código, escalabilidad y trabajo colaborativo en equipos ágiles.

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