backend development in preferably Java, or at least one object-oriented compiled, statically-typed language (C++, C#)
AI tools (e.g., Claude Code, GitHub Copilot, Codex, Cursor, etc.) in development workflows
Distributed systems and cross-service designs
cloud infrastructure (e.g., AWS, GCP) and scalable system architecture
data processing and working with APIs eg REST
test-driven development with focus on unit testing, integration testing and end-to-end automation