Open to opportunities

Antonio S

@antonios1

Message

I build production LLM agents and RAG systems that deliver reliable, personalized customer experiences.

Croatia

Message

What I'm looking for

I'm open to remote or relocation opportunities where I can build and ship production AI agents, RAG systems, and reliable full-stack AI products.

At mStart, part of Fortenova Group, I'm building a WhatsApp conversational AI agent for Konzum, Croatia's largest retail chain, designed to scale to 150,000+ users. I designed its multi-agent architecture, hybrid RAG pipeline, persistent personalization, safety controls, and GCP deployment.

I improve production reliability through debugging, observability, evaluations, CI/CD, caching, model routing, and latency optimization, reducing average response time from 10.5 seconds to 7 seconds. I also built a custom MCP server and internal web app for Agent Engine.

As founder and lead developer of Prepko, I built an online learning platform that grew to 800+ first-year FER students. I also won first place at the Neodata Hackathon for a computer vision road-network extraction system.

Experience

Work history, roles, and key accomplishments

Current

AI Engineer / Data Scientist

Current

mStart - Fortenova Group

Jan 2025 - Present (1 year 7 months)

Designed a multi-agent system on Google ADK/Gemini and built a production conversational AI agent for Konzum, Croatia's largest retail chain, architected for 150,000+ users. Implemented RAG on AlloyDB, safety classifiers, and CI/CD pipelines, reducing latency by ~30%.