During my service on the army, I was employed as a backend developer, where I:

1. Authored business logic for an inter-governmental service workflow, in Spring.
2. Developed a Java client over Greek's Government Service Insurance System (GSIS) Citizen Gate REST API.
3. Developed a Java client over GSIS Proof of Tax Awareness over SOAP.
4. Co-implemented the OAuth2 protocol over GSIS, in Spring and Spring Security.

Software Engineer & Full-Stack Developer

Niovity offers backend-as-a-service solutions and vertical repository management, over its data lake implementation. During my employment as a software engineer, I:

1. Authored the Elasticsearch management, including analytics, batch operations, custom analyzers in Java.
2. Co-implemented the front and backend parts of an in house query language compiler, over Elasticsearch.
3. Augmented the in-house query language compiler with graph operators, along with the query federation over multiple datastores (Elasticsearch & Neo4j).
4. Developed front-end applications and headless CMS using NextJS and React.
5. Automated the domain-driven generation of diagrams.
6. Release management and application deployment with Docker and Gradle over self-hosted environments.
7. Bonus: Conducted my master thesis on Niovity's semantic data lake to propose the utilization of knowledge graphs and graph technologies for improved data exploration, metadata management and advanced analytics.