08/20/2026 updated

**** ******** ****
100 % available

Full-Stack Software & Applied-AI Engineer · SaaS · Web Platforms · Cloud

Patras, Greece
Only remote
University of Patras, Dept. of Mechanical Engineering & Aeronautics (expected end of 2027)
Patras, Greece
Only remote
University of Patras, Dept. of Mechanical Engineering & Aeronautics (expected end of 2027)

Profile attachments

Dionisis_Vallianatos_CV.pdf

AI AgentsSoftware as a ServiceCloud EngineeringSystems IntegrationWorkflowsCloud Platform SystemChatbotsFlaskBackendFull Stack DevelopmentFront End Software DevelopmentArtificial Intelligence Markup Language (AIML)
Full-Stack Web Development
Expertise in building production-ready web platforms end to end, covering backend with Python, Flask, FastAPI and REST/WebSockets, as well as frontend with React 18, Vite and responsive SPAs, including geospatial visualisation with MapLibre GL and Turf.js.

Applied AI & LLM Integration
Proficiency in integrating large language models (OpenAI, Ollama, Hugging Face) into production systems, including Retrieval-Augmented Generation pipelines with LangChain, vector search using FAISS and Qdrant, and agentic orchestration workflows.

Robotics & ROS 2
Hands-on experience developing operator-guidance systems embedded in robotic manufacturing cells using ROS 2 for task orchestration and real-time guidance over WebSockets, integrated with RAG pipelines and knowledge graphs.

Data & DevOps
Solid background in database management with PostgreSQL (JSONB), MongoDB, Neo4j and Appwrite, combined with containerisation using Docker & Compose, Nginx (TLS/WAF), Linux administration, CI/CD with GitHub Actions and VPS deployment.

Security & Compliance Engineering
Knowledge of OAuth2/OIDC (Auth0), JWT, RBAC, AES/Fernet encryption at rest, PBKDF2/bcrypt, CSRF protection, audit logging and GDPR data-retention practices applied in regulated SaaS platforms.

Cloud & Infrastructure
Experience deploying live production SaaS platforms on cloud VPS environments, containerised behind Nginx WAF, with automated regulatory PDF and GeoJSON export capabilities.

Geospatial Technologies
Practical use of MapLibre GL, Turf.js, GeoJSON and shapefiles for geospatial plotting and visualisation within multi-tenant B2B web platforms.

Multi-Agent Decision Support Systems
Development of decision-support systems scoring manufacturing scenarios on quality and sustainability indices, using LLM-based qualitative assessment with Qdrant RAG and deterministic energy/CO2 agents.

Programming Languages & Scripting
Fluency in Python, C++, JavaScript (ES6+), React/JSX, SQL, Cypher, HTML5/CSS3, Bash and YAML for diverse software engineering tasks across backend, frontend and infrastructure.

Experience

Professional experience0 - 5 years
Freelancer since2024

Languages

EnglishFluentGreekBasic knowledge

Project history

Full-Stack Developer — Production Compliance SaaS (live)

Freelance
Multi-tenant B2B platform automating EU Regulation due diligence for importers and their supply chains. Built with Python/Flask API, React 18 + ES-module frontends, PostgreSQL/Appwrite, MapLibre geospatial plotting, streaming LLM assistant, automated regulatory PDF/GeoJSON export. Hardened with Auth0 OIDC, JWT, Fernet AES, CSRF, encrypted PII and audit trail, containerised behind an Nginx WAF on a cloud VPS.

Developer — AI Developer Assistant (desktop & web)

Personal Product
Local-first assistant that synthesises GitHub and Calendar activity into a morning brief and standup draft. Built with React + TypeScript, Tauri desktop shell and Flask/Docker web flavour, OS-keychain secret storage.

Developer — Evaluation Tool (Multi-Agent DSS)

Research Lab — EU Project
Decision-support system scoring manufacturing scenarios on quality and sustainability indices; LLM-based qualitative assessment (OpenAI/Ollama) with Qdrant RAG, deterministic energy/CO2 agents, FastAPI + MongoDB backend, containerised.

Developer — Chemical-Compliance SaaS

Freelance
Multi-tenant compliance engine for chemical regulation: SDS data feeds a substance/product master, a config-driven regulatory-watch engine flags portfolio impacts, and expert validation is recorded in a full audit trail. Built with FastAPI, SQLAlchemy 2, PostgreSQL and Docker.

Developer — Industrial Robotics AI Assistant (ROS 2 + RAG)

Research Lab - EU Project
Operator-guidance system embedded in robotic manufacturing cells for major European manufacturers and consumer-goods brands. ROS 2 task orchestration and real-time guidance over WebSockets; retrieval-augmented pipeline (LangChain + FAISS/Qdrant) grounded in a Neo4j knowledge graph; FastAPI + MongoDB backend with a JWT-secured admin dashboard; fully containerised.

Freelance Software Engineer

Freelance
Partnering with direct clients to deliver production software end to end, covering architecture, backend, frontend, AI integration, security and cloud deployment. Duration approximately 6 months.

Research Engineer & Software Developer

LMS, University of Patras
Applied AI, robotics and full-stack software for real-world industrial shopfloors within EU-funded projects at one of Europe's foremost manufacturing-automation laboratories. Duration approximately 2.5 years.

Contact form

Log in to get in touch

You need to be logged in to use the contact form.

Sign upLog in