Full Stack and AWS Developer

1/2022 – 5/2026

- Frontend Modernization: Participated in a JavaScript→ TypeScript migration (~70k LOC), introducing a scalable testing strategy with Jest and improving maintainability and defect detection.

- Spring Boot Microservice Maintenance: Contributed to testing, refactoring, and maintenance of a Spring Boot microservice ecosystem, improving reliability and code quality.

- Document Rendering Engine: Contributed to the build of a high performance document rendering and layout engine using custom XML markup for PDF/DOCX generation in ASP.NET Core.

- Zero Knowledge Encryption — Implemented Zero Knowledge Encryption for DSGVO compliance using Java’s BouncyCastle primitives (AES GCM, AES KW, Argon2, HKDF).

- AWS Deployment: Supported deployment workflows on AWS ECS, ensuring secure and consistent release processes.

- CI/CD Architecture: Designed and implemented a CI/CD strategy using Jenkins Multibranch pipelines, SonarQube Quality Gates, and automated ECR/ECS deployments for backend microservices and frontend.

Java-Entwickler, Amazon Web Services (AWS), ASP.NET, Continuous Integration, Docker, Hibernate (Java), Java (allg.), JavaScript-Frameworks, Jenkins, Junit, Spring Framework, SSH (Secure Shell), Typescript, Ubuntu

5/2020 – 1/2022

- Backend Development: Developed and maintained Java/Spring and Spring Boot microservices supporting high volume income market data (Bonds, Futures, Indexes, Options, etc.) processing and downstream banking systems.

- Database Architecture: Designed and optimized Oracle database structures, including large business objects spanning 60+ tables and ~1000 fields, ensuring performance and data integrity.

- Scripting & Automation: Automated operational tasks using Groovy and shell scripting on RHEL, improving deployment and maintenance workflows.

- API Integration: Worked with REST APIs and JSON/XSD based schemas to integrate internal and external data sources.

- CI/CD: Used Jenkins for CI/CD pipelines supporting secure and compliant deployments in a regulated banking environment.

Git, Java-Entwickler, Jenkins, Oracle Database, Red Hat Enterprise Linux (RHEL), Representational State Transfer (REST), Spring Framework, SQL, XSD (XML Schema Definition)

9/2018 – 3/2020

- Legacy Modernization: Refactored and stabilized large legacy Java codebases, improving maintainability and reducing defect rates in critical telecom systems.

- Microservice Development: Implemented new Spring/Spring Boot microservices to replace monolithic components and support scalable service expansion.

- API & Service Documentation: Created comprehensive documentation for existing SOAP and REST web services, enabling smoother onboarding and cross team integration.

- SOAP & CXF Integration: Built and maintained SOAP services using Apache CXF, WSDL/XSD schemas, and automated code generation pipelines.

- Testing & QA Automation: Performed service testing with SOAP UI, Groovy scripts, and Postman, ensuring reliability across distributed systems.

- CI/CD & Deployment: Used Jenkins pipelines for automated builds and deployments on Tomcat 6/7 and AWS (EC2, ELB, ECR, S3).

Java-Entwickler, Amazon Web Services (AWS), Apache Kafka, Apache Maven, Apache Tomcat, Debian Linux, Java (allg.), Jenkins, Oracle Database, SOAP, Spring Framework, WSDL (Web Services Description Language), XSD (XML Schema Definition)