Who We Are
A team of engineers based in Larisa, Greece. Building systems that last since the 1990s.
Our story
SKGT — Semantic Knowledge Graph Technologies — was founded by Stergios Papachatzis and Leonidas Tzortzis. For over 30 years, we built mission-critical systems for the Greek government: data processing pipelines, agent-based automation, and enterprise workflows — all on Oracle infrastructure.
In 2025, we entered the private sector for the first time. Hafermann Reisen, a German tour operator, asked us to replace their 30-year AS400 system. We brought the same rigor, the same depth of engagement, and the same obsession with systems that outlast trends.
Today we're building three products — REISE ERP for tour operators, Caduceus as a semantic knowledge platform, and Matrix as the agent framework underneath it all. All of them run on the architecture we've refined over three decades.
The team
Co-Founders
Stergios Papachatzis
CEO, CTO, Co-Founder
Creator of the Matrix framework. 30+ years of Oracle architecture and PL/SQL mastery. Schema designer. AI researcher. The architect behind everything SKGT builds.
Leonidas Tzortzis
Co-Founder, Lead Developer
Master-level knowledge of Oracle, databases, and the AS400 legacy systems we replace. The person the entire team defers to on database and architecture questions.
Senior Developer
Dimitris Nastos
Senior Developer
Backend architect for Caduceus. MCP server development, infrastructure, and the go-to person for any technical challenge. Decades of experience.
Developers
Aikaterina Paraskeva
Project Management, Coordination
Paris Paraskevas
AI Research, Database & Schema Design
Anestis Zazopoulos
Oracle APEX
Dimitris Tsatsis
Oracle APEX
Panagiotis Loutriotis
Oracle APEX
Fotis Petrou
Testing, AI Implementation
How we work
Never delegate judgment. Always delegate labor.
This is our core principle. AI handles the tedious work so humans can focus on decisions that matter. We don't hand over thinking — we hand over typing.
200+ sessions before a line of code
We don't build generic software and ask you to adapt. We learn your business first — every workflow, every edge case, every department. Then we build.
AI-native development
We use AI throughout our process — not as a novelty, but as infrastructure. Claude Code for development, Caduceus for knowledge management, automated quality gates on every commit.