10/17/2026 updated
100 % available
Senior Java / Spring Boot Entwickler, Backend, Microservices, REST, 18 Jahre
Milton, Canada
Only remote
Masters in software systems engineering (2008) RWTH Aachen, GermanyAbout me
Senior Java-Entwickler mit 18 Jahren Erfahrung, davon 10 Jahre bei Vodafone Kabel Deutschland. Deutscher Staatsbürger, ich arbeite remote aus Kanada in deutscher Zeitzone. Vertrag über CS2 Technologies Inc., Rechnung per Reverse-Charge. Für Kanada gilt der DSGVO-Angemessenheitsbeschluss.
Java (Programming Language)JavaScriptSpring SecurityApplication Programming Interfaces (APIs)Amazon Web ServicesAmazon Elastic Compute CloudAmazon S3Apache TomcatOracle WebLogic ServerAmazon DynamoDBEnterprise JavaBeansJava Platform Enterprise Edition (J2EE)HibernateJava Development KitJava Platform Standard Edition (J2SE)
Backend-Entwicklung mit Java (8 bis 17) und Spring Boot (2.x und 3.x): Microservices, REST-APIs, Spring Data JPA, Hibernate, Spring Security mit OAuth und JWT, Flyway.
AI-Integration: Claude (Anthropic API, AWS Bedrock), Spring AI, AI-Agenten, MCP-Server, RAG mit PostgreSQL und pgvector.
Voice AI und Telefonie: Echtzeit-Sprach-KI mit der OpenAI Realtime API, Twilio, Telnyx, SIP, Audio-Streaming über WebSockets, Deepgram, ElevenLabs.
Testgetriebene Entwicklung mit JUnit und Mockito, Code-Reviews, Clean Code.
Datenbanken: Oracle (PL/SQL), PostgreSQL, MongoDB, Informix, Abfrageoptimierung.
Integration: JMS, SOAP- und REST-Webservices (JAX-WS, JAX-RS).
Java EE: EJB, JPA, WildFly, WebLogic, JBoss, Tomcat. Migration von Java EE nach Spring Boot.
DevOps: Docker, Kubernetes, CI/CD mit Jenkins und GitLab, Maven, Git, AWS (EC2, S3, CloudFront).
Frontend und Node.js: Angular, React, Next.js, TypeScript, NestJS, React Native.
Methoden: Scrum (Professional Scrum Master), Lead Developer, Koordination von Offshore-Teams in Rumänien und Indien, 3rd-Level-Support.
Zertifiziert: Pivotal Certified Spring Professional, Oracle Java EE (JPA, EJB, Web Component), Sun Certified Java Programmer.
Experience
Professional experience10+ years
Freelancer since2022
Languages
GermanFluentEnglishFluentFrenchFluent
Project history
Architektur und Entwicklung von SaaS-Plattformen:
- Notermed (notermed.com): AI Scribe für Arztpraxen, der Arzt-Patienten-Gespräche in klinische Dokumentation umwandelt. Backend mit Java 17, Spring Boot 3.5 und Spring AI (AWS Bedrock), RAG mit PostgreSQL und pgvector, Web-Client in Next.js, Mobile-App mit React Native.
- AI-Rezeptionist für Unternehmen: Echtzeit-Sprach-KI am Telefon mit der OpenAI Realtime API, Twilio und Telnyx (SIP), Audio-Streaming über WebSockets, Deepgram und ElevenLabs. Terminbuchung und CRM-Integration während des Anrufs. TypeScript, NestJS, MongoDB.
- AgentlyLeads (agentlyleads.com): AI-natives CRM, in dem AI-Agenten auf Basis von Claude Outreach, Follow-ups und Terminbuchung übernehmen, inklusive MCP-Server. Next.js, TypeScript, Prisma, PostgreSQL, Claude API, Stripe, Mobile-App mit React Native.
- GWS Connect (gwsconnect24.com, Mitinhaber): B2B-Großhandelsmarktplatz mit geprüften Lieferanten und gemanagter Logistik. Backend mit Java 17, Spring Boot 3.5, Spring Security, Spring Data JPA, PostgreSQL, Flyway.
- Cloud-Betrieb auf AWS (CloudFront, S3, EC2, Route 53), Docker, CI/CD.
Responsible for architecture, development, and maintenance of the REST-based backend of Delphi-mobile (Android-based ticket processing app for technicians in the field)
✓ Responsible for architecture, development, and maintenance of the REST-based backend for web applications for Subcontractors
✓ Development and maintenance of REST-based backend-end based on Java EE 7 with token-based authorization based on oAuth 1.0
✓ Migration from Java EE 7 backend to Spring boot-based backend secured using JSON Web Token (JWT)
✓ Designed, programmed, and provided 3 rd -level support
✓ Performed Lead Developer Role
✓ Coordination of work with the offshore team in Romania
✓ Coordination of work with the offshore team in India
✓ Established CD/CI pipeline using Jenkins
✓ Migrated the Spring boot project in AWS on Dockers /Kubernetes Cluster
✓ Responsible for architecture, development, and maintenance of the REST-based backend for web applications for Subcontractors
✓ Development and maintenance of REST-based backend-end based on Java EE 7 with token-based authorization based on oAuth 1.0
✓ Migration from Java EE 7 backend to Spring boot-based backend secured using JSON Web Token (JWT)
✓ Designed, programmed, and provided 3 rd -level support
✓ Performed Lead Developer Role
✓ Coordination of work with the offshore team in Romania
✓ Coordination of work with the offshore team in India
✓ Established CD/CI pipeline using Jenkins
✓ Migrated the Spring boot project in AWS on Dockers /Kubernetes Cluster
Certificates
Pivotal Certified Spring Professional
VMWare2021
Professional Scrum Master
Scrum.org2016
Oracle Java EE 6 Java Persistence API(JPA) Developer
Oracle2015
Oracle Java EE 6 Enterprise JavaBean (EJB) Developer
Oracle2013
Sun Certified Java Programmer
Sun Microsystems2010
Oracle Java EE 5 Web Component Developer
Oracle2010