Konstantinos Giantsios

Kaizen Gaming

Thessaloniki, GR · 05/2025 – Present

Machine Learning Engineer

• Engineered data pipelines with Spark and Databricks on Azure, powering an agentic AI chatbot for customer experience analysis.
• Co-designed a multi-agent sports betting Copilot with Python, LangChain, and LangGraph for complex reasoning and query resolution.
• Deployed agentic AI solutions as scalable RESTful APIs with FastAPI, Docker, and Redis for low-latency production serving.
• Built comprehensive LLM evaluation frameworks using LangSmith and RAGAS for continuous monitoring and reliability.

Machine Learning / Data Engineer

• Built a RAG architecture with Elasticsearch for hybrid search of influencer profiles for targeted brand campaigns.
• Created an automated prompt engineering pipeline using OpenAI APIs and Hugging Face for domain-specific content generation.
• Designed an end-to-end computer vision system for professional headshot generation with PyTorch and OpenCV.

Atypon Systems (Wiley)

Thessaloniki, GR · 06/2020 – 05/2025

Machine Learning Engineer

• Architected hybrid retrieval (Elasticsearch + LLMs via LangChain), fine-tuning bi-encoders (MiniLM) — boosting article CTR by 100% and search CTR by 20%.
• Developed automated tagging with Transformers — 30% increase in SSR, 90% reduction in manual tagging time.
• Orchestrated model serving with NVIDIA Triton, ONNX quantization, and optimized document processing for scalable inference.
• Built real-time user profiling from streaming events — 300% increase in registrations, 200% increase in authenticated sessions.
• Created embedding retrieval evaluation pipelines (SciRepEval, BEIR) and LLM faithfulness measurement with RAGAS.