Robin Rudahl

Architecture and technical conception of the SaaS platform.

Development of backend services and REST APIs.

Design of data models and persistence layer based on PostgreSQL. Implementation of authentication and authorization using OAuth/JWT.

Fullstack development with React/Next.js and TypeScript. Integration of external services (Payments, Mail, Auth, Feature Flags).

CI/CD, Code Reviews, and technical quality assurance.

Monolith-first approach for the core and event-driven microservices for decoupled specialized functions.

Implementation of an event-driven streaming integration for continuous processing of external API events (Producer/Consumer pattern).

Setup of a dedicated Kotlin 2.0 microservice for data analysis, connected via Apache Kafka. Setup of a modern React/TypeScript frontend (Tailwind CSS, Vite) for visualizing aggregated data.

Tasks and backend development with Kotlin 2.0 and Java 21, Spring Boot, and Spring Modulith. Event processing, data aggregation & persistence (PostgreSQL). API design (REST/OpenAPI) and integration of external systems. Kafka connection (Consumer/Producer).

Frontend development with React, TypeScript, Vite, and Tailwind CSS.

Test development (JUnit 5, Mockito, Playwright), Prometheus, Grafana (Monitoring).

CI/CD with GitHub Actions and Docker. Clean Code, technical conception, architecture.

Further development of a highly critical billing and campaign system.

Phased migration of an EJB-based legacy application to a modern Quarkus/microservices architecture.

Introduction of event-based communication with Apache Kafka and gradual replacement of synchronous EJB calls with asynchronous services. Optimization of data flows, persistence, and performance in a containerized Kubernetes environment. Implementation and modernization of central backend functionalities in Java 17/21, design and implementation of new REST APIs and Kafka integration (Avro). Setup of event-driven services for decoupling business modules. Refactoring & migration of EJB components (Payara) to Quarkus microservices. Analysis and optimization of complex SQL queries.

Testing (JUnit), debugging, code reviews. Frontend extension (Angular), expansion and maintenance of monitoring and alerting (Prometheus/Grafana, ELK) for production operation.