26.10.2026 aktualisiert
100 % verfügbar
Senior Fullstack Engineer | Java, Spring, Kafka, Kubernetes | Microservices | Logistics & MedTech
Hamburg, Deutschland
Weltweit
M.Sc. Computational Engineering & Mathematics, Universitat Rovira i Virgili / UOC (2024)Über mich
Senior Java backend developer with 5+ years of experience building Spring Boot microservices in logistics (Kuehne+Nagel) and medical devices (BIOTRONIK). I build event-driven systems with Kafka, run services on Kubernetes, and take over legacy code safely. Comfortable in regulated environments.
Skills
OAuth 2.0RAGGenAILLMJavaSpring SecurityAPIsCouchbaseHibernateJUnitPythonPostgreSQLLiquibaseApache MavenMySQL
Java & Spring Boot Backend Development
Extensive experience building production-grade Java/Spring Boot services, including cloud-native microservices, REST APIs with OpenAPI design, and event-driven architectures using Kafka and RabbitMQ. Proficiency spans Java 8 through 21 and Spring Boot versions up to 3.5.
Cloud & Kubernetes Operations
Hands-on expertise deploying and operating services on Kubernetes and OpenShift across AWS and other cloud environments. Experience with CI/CD pipelines using Jenkins, Docker, Git, Maven, and platforms such as Render and Cloudflare Workers.
Observability & Security Engineering
Implementation of production observability stacks using Prometheus, Grafana and ELK for anomaly detection and compliance reporting. Security expertise includes Spring Security, OAuth 2.0/OIDC, JWT, rate limiting, SonarQube and privacy-by-design principles.
Messaging & Data Platforms
Practical experience with Kafka, Avro, RabbitMQ, PostgreSQL, Oracle, MySQL, Couchbase (NoSQL), Liquibase and Caffeine cache for building reliable, scalable data pipelines and event-driven integrations.
Frontend & Testing
Full-stack capability covering Angular, NgRx, TypeScript and React on the frontend, combined with comprehensive testing using JUnit, Jest, Cypress, Testcontainers and unit/integration/E2E testing strategies.
AI & Machine Learning
Application of Generative AI, RAG, Agentic AI, LLMOps and spec-driven development in production features. Additional experience with Python, scikit-learn, pandas, XGBoost, LightGBM and ranking algorithms for predictive modelling.
Agile Engineering & Release Management
Proficiency in Agile workflows, code review practices, release management with Jenkins cadence, architecture decision records, mentoring junior engineers and translating stakeholder requirements into deliverable features.
Test Automation
Built Java/Cypress test automation frameworks and QA workflows from scratch, integrating them into CI pipelines for both legacy and greenfield products.
Extensive experience building production-grade Java/Spring Boot services, including cloud-native microservices, REST APIs with OpenAPI design, and event-driven architectures using Kafka and RabbitMQ. Proficiency spans Java 8 through 21 and Spring Boot versions up to 3.5.
Cloud & Kubernetes Operations
Hands-on expertise deploying and operating services on Kubernetes and OpenShift across AWS and other cloud environments. Experience with CI/CD pipelines using Jenkins, Docker, Git, Maven, and platforms such as Render and Cloudflare Workers.
Observability & Security Engineering
Implementation of production observability stacks using Prometheus, Grafana and ELK for anomaly detection and compliance reporting. Security expertise includes Spring Security, OAuth 2.0/OIDC, JWT, rate limiting, SonarQube and privacy-by-design principles.
Messaging & Data Platforms
Practical experience with Kafka, Avro, RabbitMQ, PostgreSQL, Oracle, MySQL, Couchbase (NoSQL), Liquibase and Caffeine cache for building reliable, scalable data pipelines and event-driven integrations.
Frontend & Testing
Full-stack capability covering Angular, NgRx, TypeScript and React on the frontend, combined with comprehensive testing using JUnit, Jest, Cypress, Testcontainers and unit/integration/E2E testing strategies.
AI & Machine Learning
Application of Generative AI, RAG, Agentic AI, LLMOps and spec-driven development in production features. Additional experience with Python, scikit-learn, pandas, XGBoost, LightGBM and ranking algorithms for predictive modelling.
Agile Engineering & Release Management
Proficiency in Agile workflows, code review practices, release management with Jenkins cadence, architecture decision records, mentoring junior engineers and translating stakeholder requirements into deliverable features.
Test Automation
Built Java/Cypress test automation frameworks and QA workflows from scratch, integrating them into CI pipelines for both legacy and greenfield products.
Erfahrung
Berufserfahrung5 - 10 Jahre
Freelancer seit2026
Sprachen
DeutschgutEnglischverhandlungssicher
Projekthistorie
Launched a production football-forecasting social gamified platform for the 2026 World Cup with direct fan-club communication channels, ports-and-adapters architecture, calibration-first prediction system, real-time Server-Sent Events features, LLM-powered match analysis with RAG, passwordless authentication with JWTs and magic links.
Developed and operated six cloud-native Java 17/Spring Boot services supporting remote programming of implanted cardiac devices under MDR/FDA controls. Implemented production observability with ELK, Prometheus and Grafana. Owned implementation, automated testing, code review and operational quality for Kubernetes-deployed services backed by Couchbase in a cross-functional agile team.
Modernized a legacy monolith by extracting complex functionality into standalone services. Owned full-stack features from contract-first OpenAPI design through Spring services to Angular/NgRx UIs on OpenShift. Built event-driven integrations with RabbitMQ and Kafka/Avro. Managed release cadence with Jenkins, hardened security, won a company hackathon with an automation system saving over 100,000 EUR per year, and mentored an apprentice engineer.