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Jason Plymenos - PapageorgasJP
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Jason Plymenos - Papageorgas

@jasonplymenos-papage

GenAI Engineer at Synthetica building production agentic systems, including a bilingual RAG platform for enterprise documents.

Greece
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At Synthetica, I build production LLM and agent systems for enterprise clients, from custom orchestration engines to framework-based agentic RAG. I co-architected a framework-free engine that routes work across specialized sub-agents and preserves state across stateless requests.

At Mobile Technology SA, I designed and maintained a bilingual Greek-English RAG system processing more than 20,000 documents. I also built guarded text-to-SQL, incremental document ingestion, and a custom asynchronous FastAPI backend.

Across these client engagements, I co-built a reusable document-AI platform with configurable stages for segmentation, extraction, generation, and validation. I also developed LLM evaluation and regression-testing tools to assess retrieval precision, faithfulness, and instruction-following.

Before focusing on AI engineering, I worked in data science at AETHON Engineering and built the backend and data layer for TransiTool. My background combines data science with civil and transportation engineering, including thesis research on lane-change prediction using LSTM networks.

Experience

Work history, roles, and key accomplishments

Synthetica logoSY
Current

GenAI Engineer

Jul 2024 - Present (2 years 3 months)

GenAI engineer building production LLM/agent systems for enterprise clients — spanning custom-built orchestration engines, framework-based agentic RAG, and a reusable document-AI platform deployed across multiple client engagements from one shared codebase.

Agentic Orchestration — built both ways, deliberately
• Co-Architected a fully custom, framework-free agent orchestration engine for a produ

Mobile Technology SA logoMS
Current

AI Solutions Architect & Consultant (Contract)

Mar 2024 - Present (2 years 7 months)

Independent AI Consultant providing end-to-end LLM/RAG architecture and ongoing production SLA maintenance under a client services agreement.

Active Maintenance & Production Ops (Nov 2024 – Present):
• SLA & Feedback Loop: Maintain 99.9% uptime, triaging retrieval edge cases and prompt refinements via an automated user-feedback to Todoist ticketing workflow.
• Incremental ETL Sync: Manage schedul

AETHON Engineering logoAE

Data Scientist

Sep 2021 - Jul 2024 (2 years 10 months)

Data Scientist specializing in Transportation Engineering due to my educational background, adept at analyzing datasets and developing advanced machine learning models. Recognized for contributions to EU and national funded projects and tenders, with a core focus on enhancing transportation systems. Proficient in crafting deliverables and contributing in the project acquisition team for transporta

TransiTool logoTR

Data Engineer & Backend Developer

Oct 2022 - Feb 2024 (1 year 4 months)

• Architected the backend and data layer for a high-traffic transport platform using Python (OOP), focusing on scalability and API performance.
• Enhanced database efficiency by implementing advanced indexing, optimized data modeling, and TTL management for SQL/NoSQL systems, significantly reducing query latency.

FAGE logoFA

Technical Support Specialist

Jun 2014 - Jul 2014 (1 month)

· Technical Support and Enhancement of Informatics Systems
· Formatting and Configuration of Linux Systems

Education

Degrees, certifications, and relevant coursework

AB

Athens University of Economics and Business

Msc, Data Science (Part-Time for Professionals)

2023 - 2025

CO

Coursera

Python Classes and Inheritance

May 2022

NA

National Technical University of Athens

Master of Engineering, Civil Engineering | Specialization in Transportation and Highway Engineering

2014 - 2021

Thesis: Development of lane change prediction models utilizing high resolution trajectory data
Thesis Supervisor: Eleni I. Vlahogianni
Prerequisite modules: Data engineering, Artificial intelligence, road safety, prediction algorithms, Deep recurrent neural networks, LSTM RNNs

Εράσμειος Ελληνογερμανική Σχολή

High School Diploma

2008 - 2014

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