Four years of commercial development — from event-driven integrations for energy distribution to systems used by the Czech Ministry of Justice.
The intensive retraining programme that got me into professional development. Java and object-oriented design, relational databases, version control in Git — and above all teamwork on shared projects and mutual code review, which taught me more than the syntax ever did.
Three and a half years on enterprise systems for public administration and the energy sector. I started on the backend — integration logic over Apache Kafka and asynchronous event processing for Landis+Gyr and Transelectrica. I gradually moved to a fullstack role on the eSpis and eISIR project for the Czech Ministry of Justice: REST and SOAP services per XSD and WSDL contracts, query optimization over DB2, the Elastic stack, unit and integration tests, and Angular frontend support. Alongside that I built an HR integration for Sconto CZ/SK running as an Azure Function.
Java backend microservices and an Angular frontend for IDC’s AI platforms. IDC TechMatch is built on matching algorithms connecting technology buyers with vendors; IDC Quanta brings sixty years of IDC research straight into e-mail and Claude AI over MCP. On top of that: AWS, MongoDB, GitLab CI/CD and Grafana monitoring.
Programmer I — the official Oracle certification covering the Java language, collections, streams and exception handling.
Daily work with Claude Code, OpenAI Codex and Gemini CLI — not as a gimmick, but as a genuine speed-up of routine work.
The specific systems I worked on are listed under projects; client websites are under websites.