Theodoros Margazas
Principal Software Architect & Engineering Leader • AI / LLM Systems • High-Transaction & Regulated Platforms
Software architect with over two decades of experience designing and shipping production
LLM/RAG pipelines, event-driven architectures, and high-availability
platforms in high-transaction and regulated environments.
LLM & RAG Pipelines ((Claude, GPT-4o, Gemini, DeepSeek, Ollama)
Hybrid Search (kNN + BM25)
PHP 8.3 / Symfony 7, ASP.NET/C#, Python / FastAPI, C/C++
PostgreSQL, SQL Server, Oracle, MySQL/MariaDB
AWS (OpenSearch, DMS, SQS, ECS)
LLM & RAG Architecture
End-to-end RAG pipeline design, hybrid kNN + BM25 retrieval, grounded generation,
multi-provider LLM integration (Claude, GPT-4o, Gemini, DeepSeek, Ollama), Amazon Bedrock, pgvector,
and agentic workflow design[cite: 1].
Payments & Compliance
Multi-rail payout orchestration (Adyen, Swapped Commerce) across 12 currencies and 3 cryptocurrencies,
integrated with Trulioo KYC, Chainalysis AML, and real-time audit dashboards[cite: 1].
Distributed Systems
Amazon SQS, Apache Kafka, Symfony Messenger, outbox pattern design, event-driven architectures,
and exactly-once processing at high daily transaction volumes[cite: 1].
Cloud & Infrastructure
AWS ecosystem (ECS Fargate, Aurora, OpenSearch, Bedrock), Terraform, Docker containerization,
CI/CD via GitHub Actions, and high-availability platform architecture[cite: 1].
Search & Machine Learning
FastAPI NLP microservices (BERT / spaCy / MiniLM), hybrid search routing, behavioral personalization engines,
and Gradient Boosting models for price prediction[cite: 1].
Engineering Leadership
Direct team ownership (engineers + vendors), technology roadmap authorship, architectural governance,
and multi-year budget and P&L management[cite: 1].