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I'm an AI Engineer and Full-Stack Developer with 6+ years of hands-on software development and a medical degree. I build and ship production AI products — from multi-tenant SaaS platforms to clinical data systems and conversational AI agents. As a physician, I understand clinical workflows, compliance requirements, and domain nuances that help me ship software that solves real problems for real users. I thrive in fast-paced environments, own the full stack end-to-end, and care deeply about impacting healthcare through elegant, reliable software.…I'm an AI Engineer and Full-Stack Developer with 6+ years of hands-on software development and a medical degree. I build and ship production AI products — from multi-tenant SaaS platforms to clinical data systems and conversational AI agents. As a physician, I understand clinical workflows, compliance requirements, and domain nuances that help me ship software that solves real problems for real users. I thrive in fast-paced environments, own the full stack end-to-end, and care deeply about impacting healthcare through elegant, reliable software.

Apostolos Agiannidis

PRO

Full Stack Developer, AI Engineer, Web Developer, +3

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I'm an AI Engineer and Full-Stack Developer with 6+ years of hands-on software development and a medical degree. I build and ship production AI products — from multi-tenant SaaS platforms to clinical data systems and conversational AI agents. As a physician, I understand clinical workflows, compliance requirements, and domain nuances that help me ship software that solves real problems for real users. I thrive in fast-paced environments, own the full stack end-to-end, and care deeply about impacting healthcare through elegant, reliable software.…I'm an AI Engineer and Full-Stack Developer with 6+ years of hands-on software development and a medical degree. I build and ship production AI products — from multi-tenant SaaS platforms to clinical data systems and conversational AI agents. As a physician, I understand clinical workflows, compliance requirements, and domain nuances that help me ship software that solves real problems for real users. I thrive in fast-paced environments, own the full stack end-to-end, and care deeply about impacting healthcare through elegant, reliable software.

Available to hire

Bratislava, Slovakia

I’m an AI Engineer and Full-Stack Developer with 6+ years of hands-on software development and a medical degree. I build and ship production AI products — from multi-tenant SaaS platforms to clinical data systems and conversational AI agents.

As a physician, I understand clinical workflows, compliance requirements, and domain nuances that help me ship software that solves real problems for real users. I thrive in fast-paced environments, own the full stack end-to-end, and care deeply about impacting healthcare through elegant, reliable software.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Greek, Modern

Fluent

English

Fluent

German

Advanced

Slovak

Intermediate

Work Experience

Lead Engineer at NutriCRM — Clinical AI Platform

January 1, 2025 - Present

Building a clinical management platform that aggregates data from genetic reports (DNA), metabolic testing (PNOE), body composition devices (Tanita), and epigenetic panels. Developed document parsing pipelines for structured and unstructured health data including lab reports and device APIs. Integrated Claude API for protocol generation with structured output and basic validation before data reaches clinicians.

Lead Engineer at Guestia — AI Concierge SaaS

January 1, 2024 - Present

Built a multi-tenant property management and AI concierge platform for hotels and short-term rentals. Developed RAG-powered guest interaction, automated task routing, and per-room pricing billing logic. Designed multi-tenant architecture with queue-based async processing and third-party integration layer.

Application Developer & Web Engineer at Freelance

January 1, 2016 - December 31, 2018

Built client websites, CMS integrations, and internal tools across multiple industries, parallel to medical studies.

Founder & Lead Engineer at Stolos, Tech & AI Agency

January 1, 2022 - Present

Founded and lead a software agency delivering AI-powered SaaS products for clients in healthcare, hospitality, fintech, and e-commerce. Ship production LLM integrations (Claude, OpenAI, Gemini) including conversational agents, document automation, and recommendation systems used by paying customers. Own the full product lifecycle: scoping, architecture, backend (Node.js, Laravel), frontend (React, Next.js), databases, cloud infrastructure, and deployment. Manage 30+ active repositories and deliver iteratively, working directly with stakeholders from concept to launch.

Lead Engineer at NutriCRM, Clinical AI Platform

January 1, 2025 - Present

Building a clinical management platform that aggregates genetic, metabolic, body composition, and epigenetic patient data into unified care protocols for nutritionists. Developed AI-powered session documentation that converts unstructured clinician notes into validated, structured records — with safety checks to prevent inaccurate data from reaching patients. Integrated with medical devices (TANITA, PNOE, iDNA) and built automated parsing for lab reports, PDFs, and health exports — eliminating hours of manual data entry. Designed GDPR-compliant architecture with zero data retention for sensitive patient information. Built report generation (Excel, Word, PDF), email automation, and cloud file management for clinical workflows.

Lead Engineer at Guestia / hostAI, AI Concierge SaaS

January 1, 2024 - Present

Built a multi-tenant AI concierge platform for hotels and short-term rentals — production-live with paying customers. Developed an AI guest assistant that answers questions, takes orders, and escalates to staff 24/7, across web chat and WhatsApp in 30+ languages. Built a knowledge system that learns from uploaded property documents and past host interactions, improving answer accuracy over time. Engineered smart escalation with risk classification, automated task routing, and real-time SMS/push notifications to property managers. Integrated Stripe billing with per-room pricing, authentication, and real-time updates for a fully self-serve multi-tenant product.