Андрій

ANDRII PROFILE

BLONSKYI Backend-focused Java engineer with 9+ years of experience building reactive, event-driven
microservices, IoT data platforms and web applications. Specialised in Vert.x and Quarkus
architectures, Spring Boot, access-control systems, and full-cycle delivery — from architecture
Java / Backend Engineer
and implementation to CI/CD and production debugging. Consistent track record on remote
contracts with European clients.

CONTACT EXPERIENCE
[open contact info](look above in the "contact info" section)
Backend Java Developer · DKSR Remote
[open contact info](look above in the "contact info" section)
2025 — 2026
Kyiv, Ukraine
– Developed and extended a large-scale IoT data platform built on reactive microservices
– Implemented authentication and authorisation flows, including integration with external
identity and metadata services
SKILLS – Integrated with Piveau open data portal, implementing DCAT/RDF metadata synchronisation
between the IoT platform and the catalogue
Backend
– Worked across multiple platform modules: data ingestion, event processing, outbound
· Java delivery, and management APIs
· Vert.x (reactive) – Developed a Spring Boot + Vaadin demonstrator app with real-time sensor data and
· Quarkus (CDI) PostgreSQL-backed forecasting
· Spring Boot Tech: Java, Vert.x, Quarkus, Spring Boot, PostgreSQL, Elasticsearch, Keycloak, Piveau, RabbitMQ,
· Hibernate / JPA Docker, Kubernetes, GitLab CI/CD

Databases Lead Java Developer · MedJacket Remote
· PostgreSQL 2020 — 2025
· Elasticsearch – Led backend development of a telemedicine platform integrating IoT medical devices
· MySQL – Built REST APIs and WebSocket services handling real-time device telemetry and patient
· MongoDB monitoring
Auth & Security – Integrated RabbitMQ for asynchronous messaging between platform modules
· Keycloak (RBAC, UMA) – Worked with Raspberry Pi edge hardware and synchronised data with cloud backend
· OAuth2 / JWT services
· Spring Security Tech: Java, Spring Boot, RabbitMQ, MySQL, Raspberry Pi, REST APIs, AWS

Infrastructure Java Architect / Freelance · Various clients Remote
· Docker 2019 — 2020
· Kubernetes – SmartCoach — GPS-enabled sports performance system with MapBox SDK and hardware
· RabbitMQ integration
· GitLab CI/CD – Paperless — COVID-era health declaration app with dynamic questionnaire logic and
· Maven automated workflows
· Gradle – Invoice Recognizer — OCR-based document processing tool for automated data extraction
· AWS Tech: Spring Boot, MongoDB, PostgreSQL, OCR, REST APIs, jQuery, JavaScript

Frontend (supporting) Full-Stack Java Developer · Solid Apps GmbH Braunschweig, Germany (remote)
· Vaadin 2017 — 2020
· JSP – Developed REST APIs for mobile and web applications using Spring Framework
· Thymeleaf – Built Appointments app (dental/service bookings) integrated with Google Calendar API
· HTML/CSS – Frontend work using JSP, Thymeleaf, and MVC patterns; mathematical modules written in
· jQuery/JavaScript C++ via SWIG
Tech: Java, Spring Boot, Spring Security, Spring Data, Hibernate, PostgreSQL, MySQL, SQLite, Maven,
Tools
Gradle
· IntelliJ IDEA
· Git Java Developer · Protoka Center Kyiv, Ukraine
· Linux / bash 2016 — 2017
– Built a document workflow web application for the National Academy of Sciences of Ukraine
– Used Vaadin for dynamic forms, hierarchy rendering, and reports; integrated IBM Informix
SQL
LANGUAGES
Tech: Java, Vaadin, IBM Informix SQL
Ukrainian — native
English — fluent EDUCATION
German — fluent
Master’s Degree in Software Engineering
National Technical University of Ukraine — Kyiv Polytechnic Institute Graduated 2020
Erasmus+ Exchange Semester
Angel Kanchev University, Ruse, Bulgaria 2017 · Faculty of Computer Engineering