What I am working on and what is already live.
Platform for finding and creating outdoor events. Simple interface, tools for organising and sharing across social media.
My part: Rebuilding the backend as a Spring Boot service: data model, REST API, Flyway migrations, Testcontainers. Operated on my own server.
Three-year apprenticeship. Production development of the business platforms gypsilon workflow and kzwo. Java, Spring Boot, real customers.
My part: Built and maintained REST APIs with Java and Spring Boot, documented with OpenAPI. Final project: appointment management module for K-ZWO, entities and data model, recurring appointments with calendar logic.
Fill and sign PDF forms in the browser. Runs fully locally, the file is never uploaded. No account needed, three languages, with guides for German official forms.
My part: Sole developer and operator. Form processing runs in the browser, the file never leaves the device. Deployment, TLS and monitoring on my own server.
Platform for spiritual journeys and retreats. Bilingual (RU/UA), booking wizard, custom analytics.
My part: Architecture and development: data model, booking flow, tenant separation, custom analytics with no third party.
Landing page for a facility management service in Düsseldorf and NRW. Service overview, contact form with email delivery, dedicated sections for solar installations and IT service.
My part: Client work: build, contact form with email delivery, hosting and maintenance.