Dario Mesić-Senior Full-Stack & AI Systems Engineer
Check rate
Experience
Frontend Engineer & UI Designer
Raiffeisen Bank
- Engineered responsive cross-platform financial dashboards utilizing Angular, TypeScript, and RxJS. Built component libraries from scratch in Figma and code.
Software Engineer
AI Tech
- Full-Stack Architecture & System Design: Architected and engineered both the frontend (TypeScript) and backend (Python, FastAPI, PostgreSQL) for the official EGDC repository. Designed end-to-end data pipelines, custom routing, state management, and robust Role-Based Access Control (RBAC).
- Database & Data Modeling: Modeled relational database schemas in PostgreSQL to handle complex JSON payloads, dynamic one-to-many environmental benefit datasets, draft-saving states, and secure multipart file upload streams.
- EU Standards & Accessibility: Implemented the European Commission Component Library (ECL v5 / eUI) across the frontend, ensuring strict compliance with official EC visual identity standards and WCAG 2.1 AA accessibility guidelines.
- API Specifications & Validation: Authored and consumed OpenAPI/Swagger specifications and JSON Schemas for dynamic payload validation, address models, and structured reporting workflows.
- DevOps & Collaboration: Architected 3-tier Dockerized environments using YAML configurations, managed automated CI/CD pipelines, and maintained GitHub / GitLab branching workflows aligned with EC open-source guidelines (code.europa.eu). Coordinated project deliverables via SharePoint and Microsoft Teams.
Head of Frontend & AI Development
Virtual Assistants & AI Platforms
- AI & LLM Architecture: Led full-stack development of enterprise AI virtual assistant platforms for the Ministry of Justice, CARNET, and Strives AI.
- RAG & Vector Search: Architected Retrieval-Augmented Generation (RAG) workflows, integrated Vector Databases, implemented Semantic Search, and performed Prompt Evaluation to eliminate noise and false positives.
- Chatbot Framework: Built a multi-client chatbot interface inspired by IBM Watson using Python (Flask/FastAPI), REST APIs, and PostgreSQL.
Industry Experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Government and Administration, and Banking and Finance.
Business Area Experience
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Experienced in Information Technology, Product Development, and Research and Development.
Summary
I'm a Senior Full-Stack & AI Systems Engineer with an MSc in Software Engineering & Information Systems and nearly a decade of experience bridging complex frontend architectures (React, Angular, Vue.js, TypeScript) with intelligent backends (Python, FastAPI, Flask, PostgreSQL). I'm specialized in end-to-end web system design, relational database modeling, Semantic Web standards (RDF, SPARQL, CDM), AI/LLM pipelines (RAG, Vector Databases, Semantic Search), and European Commission UI/accessibility standards (ECL v5, eUI, WCAG 2.1 AA).
Recently, I have specialized in building accessible, multilingual AI-driven interfaces and chatbots for high-profile government and enterprise clients. I am detail-oriented, tech-savvy, and highly adaptable to complex accessibility guidelines (like WCAG 2.1 AA).
Skills
Overview Senior Full-Stack & Ai Systems Engineer (Msc) With Nearly A Decade Of Experience Building Scalable Enterprise Architectures, Ai/Llm Integration Pipelines, And Accessible Digital Platforms Across Europe.
Most Important Skills
Full-Stack Architecture: Designing Resilient Web Platforms, Custom Microservices, And High-Performance Rest Apis Using Python (Fastapi, Flask) And Modern Typescript Frameworks (React, Vue, Angular).
Ai & Llm Engineering: Building Retrieval-Augmented Generation (Rag) Workflows, Integrating Vector Databases, Implementing Semantic Search, And Performing Ai Prompt Evaluation.
Semantic Web & Data Modeling: Expert In Rdf Triplestores, Sparql, Graphdb, Relational Postgresql Design, And Common Data Model (Cdm) Standards.
Eu Standards & Accessibility: Hands-On Experience Developing High-Compliance Applications Following Strict Wcag 2.1 Aa Accessibility Standards And European Commission Visual Libraries (Ecl V5 / Eui).
Technologies I Specialise In
Backend: Python (Fastapi, Flask), Postgresql, Java (Spring Boot), Graphdb, Rest Apis, Json Schema / Openapi
Frontend & Design: Typescript, React, Vue.Js, Angular, Figma, Wcag 2.1 Aa, Ecl V5 / Eui
Ai & Cloud: Rag Architectures, Vector Databases, Semantic Search, Docker, Ci/Cd (Gitlab, Github, Jenkins), Aws/Gcp
What Sets Me Apart
Full-Stack + Ai Bridge: I Bridge The Gap Between Intelligent Ai Backends (Llms, Rag, Knowledge Graphs) And Polished, Accessible User Interfaces, Shipping Production-Ready Systems Rather Than Standalone Prototypes.
Enterprise & Public Sector Proven: Proven Track Record Delivering Mission-Critical Projects For European Commission Initiatives (Egdc), Transmission System Operators (Hops), Banking Groups (Raiffeisen Bank), And Government Bodies.
Eu & Dach Alignment: Eu Citizen Based In Croatia (Cet Timezone), Fluent In English (C1), With Working Comprehension Of German (B1)—Enabling Seamless Collaboration With European Enterprise Teams.
Languages
Education
University of Zagreb, Faculty of Electrical Engineering and Computing
MSc · Software Engineering and Information Systems · Zagreb, Croatia
University of Zagreb, Faculty of Electrical Engineering and Computing
BSc · Computer Science · Zagreb, Croatia
Certifications & licenses
GraphDB Developer and Architect
Ontotext Academy
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Experience
Expertise
Qualifications
Profile
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