Java Engineer | Spring Boot | Legacy Modernisation | Microservices | Full-Stack
Aktualisiert am 30.04.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 01.05.2026
Verfügbar zu: 100%
davon vor Ort: 100%
Java
Spring Boot
Back-End
Software-Entwicklung
PostgreSQL
Relationales Datenmodell
CI/CD
DevOps
React
Vue.js
TypeScript
Testautomatisierung

Einsatzorte

Einsatzorte

Berlin (+50km)
Deutschland
möglich

Projekte

Projekte

6 months
2025-09 - 2026-02

Backend-for-Frontend Architecture ? Mobile Agriculture Platform

Java Engineer ? Backend & Microservices Java Spring Boot PostgreSQL ...
Java Engineer ? Backend & Microservices

  • designed and delivered a Spring Boot BFF layer consolidating data from multiple backend services,  reducing mobile API response complexity and improving frontend performance on a production, mobile-first platform.
  • Extended and maintained RESTful APIs inside a live microservices architecture without disrupting existing consumers.
  • Applied TDD to eliminate critical production defects and maintained GitLab CI/CD pipelines across build, test, and deployment stages.

Java Spring Boot PostgreSQL GitLab CI/CD REST APIs TDD Microservices
2 years
2023-09 - 2025-08

Legacy Java Modernisation ? Enterprise Data Management System

Java & Full-Stack Engineer Java Kotlin Spring Boot ...
Java & Full-Stack Engineer

  • Led the architectural refactor of a large-scale legacy Java platform at enterprise scale, reducing technical debt, improving long-term maintainability, and shortening onboarding time for new engineers.
  • Built deployable backend microservices  and frontend microservices .
  • Established SonarQube audit pipelines that surfaced security vulnerabilities earlier in the development cycle and gave the team quantifiable visibility into code quality over time.

Java Kotlin Spring Boot Vue.js React TypeScript PostgreSQL DB2 Jenkins Azure Devops SonarQube Eureka TailwindCSS
1 year 7 months
2022-02 - 2023-08

API Integration & Authentication Platform ? Mobility Solutions

Java Engineer ? Backend & Integration Java Spring Boot PostgreSQL ...
Java Engineer ? Backend & Integration

  • Built a Spring Boot BFF layer integrating the Parkopedia parking API, decoupling frontend logic from third-party API contracts and improving overall application usability.
  • Implemented Keycloak-based authentication and authorisation across multiple applications, centralising identity management and hardening platform security.
  • Established CI/CD pipelines with OWASP dependency scanning and Azure deployment.
  • Delivered an internal communication platform.

Java Spring Boot PostgreSQL Redux TypeScript Liquibase React Docker Keycloak Microsoft Azure Bootstrap OWASP

Aus- und Weiterbildung

Aus- und Weiterbildung

4 years
2019-10 - 2023-09

Medical Informatics

B.Sc., University of Applied Sciences Mittelhessen (THM), Giessen
B.Sc.
University of Applied Sciences Mittelhessen (THM), Giessen
Software development, databases, and healthcare IT systems. Foundation in Java, applied algorithms, data modelling, and system architecture, directly transferable to enterprise software engineering.

Position

Position

Java and Spring Boot engineer with 4+ years of full-time delivery inside German enterprise environments. Specialised in legacy Java modernisation, microservices architecture, and full-stack delivery. Now available for contract and consulting engagements.

I integrate into existing teams quickly, take full ownership of deliverables, and deliver production-ready code from day one.

Kompetenzen

Kompetenzen

Top-Skills

Java Spring Boot Back-End Software-Entwicklung PostgreSQL Relationales Datenmodell CI/CD DevOps React Vue.js TypeScript Testautomatisierung

Programmiersprachen

Java
Experte

Design / Entwicklung / Konstruktion

Software Development
Experte

Branchen

Branchen

  • Information Technology and Software
  • Automotive & Mobility
  • Agriculture & Farming
  • Consulting & Professional Services
  • Enterprise Software

Einsatzorte

Einsatzorte

Berlin (+50km)
Deutschland
möglich

Projekte

Projekte

6 months
2025-09 - 2026-02

Backend-for-Frontend Architecture ? Mobile Agriculture Platform

Java Engineer ? Backend & Microservices Java Spring Boot PostgreSQL ...
Java Engineer ? Backend & Microservices

  • designed and delivered a Spring Boot BFF layer consolidating data from multiple backend services,  reducing mobile API response complexity and improving frontend performance on a production, mobile-first platform.
  • Extended and maintained RESTful APIs inside a live microservices architecture without disrupting existing consumers.
  • Applied TDD to eliminate critical production defects and maintained GitLab CI/CD pipelines across build, test, and deployment stages.

Java Spring Boot PostgreSQL GitLab CI/CD REST APIs TDD Microservices
2 years
2023-09 - 2025-08

Legacy Java Modernisation ? Enterprise Data Management System

Java & Full-Stack Engineer Java Kotlin Spring Boot ...
Java & Full-Stack Engineer

  • Led the architectural refactor of a large-scale legacy Java platform at enterprise scale, reducing technical debt, improving long-term maintainability, and shortening onboarding time for new engineers.
  • Built deployable backend microservices  and frontend microservices .
  • Established SonarQube audit pipelines that surfaced security vulnerabilities earlier in the development cycle and gave the team quantifiable visibility into code quality over time.

Java Kotlin Spring Boot Vue.js React TypeScript PostgreSQL DB2 Jenkins Azure Devops SonarQube Eureka TailwindCSS
1 year 7 months
2022-02 - 2023-08

API Integration & Authentication Platform ? Mobility Solutions

Java Engineer ? Backend & Integration Java Spring Boot PostgreSQL ...
Java Engineer ? Backend & Integration

  • Built a Spring Boot BFF layer integrating the Parkopedia parking API, decoupling frontend logic from third-party API contracts and improving overall application usability.
  • Implemented Keycloak-based authentication and authorisation across multiple applications, centralising identity management and hardening platform security.
  • Established CI/CD pipelines with OWASP dependency scanning and Azure deployment.
  • Delivered an internal communication platform.

Java Spring Boot PostgreSQL Redux TypeScript Liquibase React Docker Keycloak Microsoft Azure Bootstrap OWASP

Aus- und Weiterbildung

Aus- und Weiterbildung

4 years
2019-10 - 2023-09

Medical Informatics

B.Sc., University of Applied Sciences Mittelhessen (THM), Giessen
B.Sc.
University of Applied Sciences Mittelhessen (THM), Giessen
Software development, databases, and healthcare IT systems. Foundation in Java, applied algorithms, data modelling, and system architecture, directly transferable to enterprise software engineering.

Position

Position

Java and Spring Boot engineer with 4+ years of full-time delivery inside German enterprise environments. Specialised in legacy Java modernisation, microservices architecture, and full-stack delivery. Now available for contract and consulting engagements.

I integrate into existing teams quickly, take full ownership of deliverables, and deliver production-ready code from day one.

Kompetenzen

Kompetenzen

Top-Skills

Java Spring Boot Back-End Software-Entwicklung PostgreSQL Relationales Datenmodell CI/CD DevOps React Vue.js TypeScript Testautomatisierung

Programmiersprachen

Java
Experte

Design / Entwicklung / Konstruktion

Software Development
Experte

Branchen

Branchen

  • Information Technology and Software
  • Automotive & Mobility
  • Agriculture & Farming
  • Consulting & Professional Services
  • Enterprise Software

Vertrauen Sie auf Randstad

Im Bereich Freelancing
Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

Fragen?

Rufen Sie uns an +49 89 500316-300 oder schreiben Sie uns:

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