Thodoris MargazasPrincipal Software Architect · AI / LLM Systems
Engineering leader who designs and ships production LLM systems inside regulated, high-value transactional environments — at national and fintech scale.
Selected work
Three of these run live on this server — try them with the guest login.
School Timetabling Platform
A CP-SAT engine that always returns a timetable: unplaced lessons are explained, conflicting locks are reduced to a minimal infeasible core, and manual edits are protected by an independent validator. Multi-tenant, with live progress, versioning, what-if scenarios, mandatory MFA and row-level security.
Aquaculture Data Platform
A differentiable grey-box growth model trained on daily production, plus a forecasting stack that runs from physics through a statistical baseline, XGBoost residuals and a sequence model to LLM synthesis.
Tourist Guide AI & Customer Support AI
Two framework-free RAG systems on one shared architecture: hybrid kNN + BM25 retrieval and grounded generation — a multi-turn tourist-guide assistant and a customer-support agent.
Training Material Creator Agent
Explores any web app in a real browser and writes training modules with annotated screenshots and narrated videos in English and Greek, updating only what changed on each release.
Greek Legal Corpus — RAG + QLoRA
RAG over Greek legislation with source-grounded answers, plus a QLoRA fine-tuned 7B model evaluated against its base and served locally as GGUF.
Experience
Two decades on national and fintech-scale platforms.
Independent AI Architect
- RAG, forecasting, fine-tuning, agents and constraint scheduling.
- Provider-agnostic, framework-free, backtested.
Head of Engineering
- AI search and price prediction, 120K+ listings.
- $400K+ daily payouts, reconciled every day.
- OpenSearch: 99.9% availability, −50% cost.
- 5 engineers, P&L, KYC / AML.
Engineering Manager & Principal Architect
- 1535 healthcare platform: 3 → 50 hospitals.
- National Bank of Greece, 11888, Price Observatory.
- 8 engineers and 7 vendors.
Skills
M.Sc. Computer Engineering, Technical University of Crete · Greek (native), English (professional)
Let's talk
Available for remote or hybrid roles, with regular on-site presence in Athens possible.