I will build a secure spring boot microservices

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ettiboa_dev
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ettiboa_dev
Ettiboa A
build a secure spring boot microservices
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build a secure spring boot microservices

About this gig

Enterprise-Grade Spring Boot Microservices | Java 21 & Security Expert

Are you looking for a backend system that isn't just "working," but is secure, scalable, and production-ready?


WHAT YOU GET

  • REST API designed with OpenAPI 3 (contract-first)
  • Spring Boot 3 / Java 21 
  • Security: Keycloak, OAuth2, Spring Security 
  • Database: PostgreSQL + Hibernate/JPA 
  • Docker-ready (Dockerfile + docker-compose) 
  • Unit & integration tests (JUnit, Mockito) 
  • Clean architecture (Hexagonal / DDD) 
  • Full documentation


MY EXPERIENCE INCLUDES

  • Behörden ePayment module (EpayBL-compliant, multi-tenant, end-to-end encrypted) 
  • KRITIS billing system at Amprion GmbH (German energy grid operator) 
  • CO emissions calculator: migrated from Excel to secure multi-tenant web application 
  • 500+ daily transactions in production (Stripe integration)


TECH STACK

Java 21 · Spring Boot 3 · OpenAPI 3 · Keycloak · OAuth2PostgreSQL · Hibernate · Liquibase · Docker · Kubernetes GitLab CI/CD · Maven · SonarQube


BEFORE YOU ORDER

To ensure the best quality and a realistic timeline, please message me before ordering. Lets discuss your requirements to find the perfect package for your project.

  • Expertise

    • Algorithms & Data structures
    • Security
    • Design
    • Databases
    • Source control

  • Programming language

    • Java

  • Backend framework

    • Spring

Get to know Ettiboa A

Ettiboa A

Senior Java Backend Developer

  • FromGermany
  • Member sinceFeb 2026

  • Languages

    French, German, English
15+ years building secure, scalable backend systems for critical infrastructure (KRITIS), government digitalization (eGovernment, ePayment), and payment solutions. Most recently: migrated an Excel-based CO₂ tool to a multi-tenant web application. Certified in Secure Software Engineering (TeleTrust/DEKRA). Java 21 · Spring Boot · Keycloak · Docker · Kubernetes · DDD · OpenAPI-first.

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