Lead Developer / Software Architect

Responsible for the redevelopment of a billing and validation software for prescriptions to fully check and analyze e-prescriptions for correctness (content, billing)

System consists of multiple contexts running as services (Docker containers):

Checking and processing data deliveries via FTP and email

Management of invoicing, clearings, deductions and offsets

Management and execution of validation rules and test sets

Analytics based on Metabase

Developer Stack: Kotlin, Vue 3 / Vuetify 3, ANTLR, Spring Boot 3, REST API, Gradle, Docker, GitLab, PostgreSQL, Kafka, Keycloak, Scrum, Grafana, Loki, Testcontainers, Prometheus

Further development of the B2B platform for integrating consumption data and controlling various heating systems (gas boilers, heat pumps) via public REST APIs for B2B partners

Platform consists of multiple microservices communicating synchronously (REST) and asynchronously (Kafka)

Data persistence in MongoDB or service-specific via Kafka Streams

Access control through Azure API Management and API specification described in the Azure Developer Portal

Developer Stack: Java 17–21, Go, Azure / APIM / Developer Portal, Spring Boot 2–3, Gradle, MongoDB (Atlas), Kafka / Kafka Streams, REST API / OpenAPI, GitHub / GitHub Actions, JWT / OAuth2, DevOps, Terraform, Instana, Grafana, Kibana, JUnit, Testcontainers, Mockito, Spring Boot Test, K6

Development (part-time) and continuous improvement of a comprehensive CRM platform (contacts, email, calls, tasks, documents) as a modular monolith in Java 21 on Azure cloud with Spring Boot 3, Vue and Docker

Developer Stack: Java 21, Azure, Vue / Vuetify, Spring Boot 3, Gradle, PostgreSQL, GitHub, Docker, JUnit, Testcontainers, Mockito, Spring Boot Test

Relaunch of the CRM platform for car dealers as a modulith in Java 11 and Spring Boot on Google Cloud

Launch of an online marketplace for electric vehicles as a standalone frontend with Vue and TypeScript with REST calls to the CRM platform

Developer Stack: Java 11, Spring Boot, Vue / Vuetify, TypeScript, Google Cloud, GitLab, JUnit, Testcontainers, Mockito, Spring Boot Test

Providing self-service features for the registration process, order management and email sending based on a microservice landscape in AWS using .NET and C# as well as newer services in Kotlin and Spring Boot

Migration from .NET Core 2.1 to 3.1 / C# 8

Developer Stack: .NET Core / C#, Kotlin / Spring Boot, TypeScript / React, REST / DDD, Kafka, Concourse, Kubernetes / Helm / Docker, AWS, PostgreSQL, Scrum, Git, GitHub, SSL / TLS, JUnit, Testcontainers, Mockito, Spring Boot Test, TestCafe

Further development of the ICAS platform

Developer Stack: Eclipse RCP / OSGI, Spring, Servlet, Data Distribution Service (OMG, RTI), Java 8, Git

Development and enhancement of portlets for the broker portal (JSF, Portlets, JPA, JAX-WS, XML, WS-Security, SAML, SSL/TLS, gSOAP)

Projects:

Self-Service Portal

Data inquiry for commissions and contract data

Support and further development of all web applications and the CMS system based on Lotus Domino; technical responsibility for the SitLap product

Projects:

Redesign of the SitLap product based on JSF / RichFaces and Hibernate

SitLap (Java, Struts, Apache FOP): financial planning tool including concept creation (PDF)

Business Report (Java, Struts): reporting and BI tool for sales

Excalibur (Java, Eclipse RCP, Hibernate): desktop application for capturing customer, advisor, application, and commission data