Joni Hahkala

Developed medical data processing, transformation, storage and communication systems linking hospitals and doctor's practices. Implemented CI/CD system with releases and deployments to Kubernetes clusters. Technologies: Java, Spring Boot, Postgres, Kubernetes, Docker, Jenkins, Git, Maven, RabbitMQ, Hibernate, OpenEHR, HL7v2, FHIR, Intellij

Implemented new features; restructured, simplified and brought up to date existing code; defined apis. Used: Spring boot, Netflix stack, Kafka, Docker, Microservices. Maintained the Android app. Technologies: Java, Spring Boot, MongoDB, Docker, Jenkins, Git, Maven, Kafka, Hibernate, Intellij

Planned and implemented new app screens and features. Restructured and rewrote the codebase using latest technologies (Android Jetpack). Optimized the database structure. Defined backend APIs.

Held a course on Distributed Systems for the International Management for Business and Information Technology program

Creation of the main idea. Design of the overall architecture of secure cloud data storage The initial implementation of the Java backend and Android app Management of subcontracted developers

Design of overall system and creation of backend for submitting special Bitcoin transactions.

Research and development of authentication and authorization systems for globally distributed computing system.