riccardo-sapuppo

About Me

Riccardo Sapuppo

Full-stack work across front end, back end and relational data, from browser interfaces to mobile and desktop delivery.

I work across the full delivery path: user interfaces, APIs, relational data and the workflows that connect them.

My experience spans Angular, React, TypeScript and RxJS on the front end; Node.js, Express, FastAPI, .NET Core and C# on the back end; PostgreSQL, SQL Server and MySQL for data.

I have delivered web, mobile and desktop applications with Ionic and Electron, put into service with Docker and CI/CD pipelines or on Windows Server, and built multi-tenant booking platforms, offline-first synchronisation, scheduled jobs, third-party integrations, query optimisation and caching. More recently I have integrated language models into products already in service: a conversational booking agent, retrieval over company documents, schema-constrained extraction.

My domain experience includes healthcare, medical imaging and operational platforms, where accuracy, reliability and clear workflows are essential.

Scope: front end, back end and relational data

Platforms: web, mobile and desktop

Core stack: Angular, React, Node.js, PostgreSQL and SQL Server

AI and LLM: RAG, AI agents, LangChain, LangGraph, OpenAI API and Ollama

Architecture: offline-first sync, scheduled jobs, integrations

Career: software development since 2017

Based in Catania, Italy — available for fully remote roles

// Work experience since 2017

  1. Full-stack Developer @Software house

    May 2022 — now

    Catania, Italy

    • Owned the company’s multi-tenant patient booking product from analysis to release: 24 centres, 9,800+ registered users, 12,400+ bookings.
    • Proposed and carried out moving the centre-to-cloud synchronisation out of SQL Server stored procedures into Node.js, ending the redundant exam-row copies the procedures kept writing (80+ million, down to about 85,000): disk writes fell from ~575/s to 1–3/s, write latency from 150–600 ms to under 9 ms.
    • Shipped language-model features into products in service: a LangGraph agent in Python and FastAPI that books, reschedules and cancels examinations over phone and messaging and hands over to a person outside its domain, a retrieval-augmented chat over company documents, and schema-constrained extraction that sorts order email into nine intents.
    • Built DICOM viewers in React and Electron, for the browser and the desktop, with 2D/3D reconstruction, measurements, multi-monitor reading rooms and PACS access over DICOMweb, plus the reporting and central monitoring of installations across multiple healthcare sites.
    • Built Node.js and Express REST services on PostgreSQL and SQL Server: an internal OCR service with OAuth2 client credentials, per-client rate limits and synchronous, streaming or asynchronous modes; scheduled jobs for database maintenance and notifications; Windows installers that configure IIS.
    • React
    • Angular
    • Ionic
    • Electron
    • Node.js
    • Express
    • Python
    • FastAPI
    • OpenAI API
    • Mistral AI
    • LangGraph
    • RAG
    • AI agents
    • PostgreSQL
    • SQL Server

  2. Software Developer @bp&a

    Oct 2020 — Apr 2022

    Acireale, Italy

    • Built the Angular dashboard for a bank’s mortgage payoffs and the back end for decommissioning electronic toll devices.
    • Built a barcode-driven mail flow: scanning a letter sent its recipient’s details to the back end, and Puppeteer entered them into the postal service’s official web form, with no manual retyping.
    • Angular
    • Ionic
    • .NET Core
    • C#
    • Node.js
    • Puppeteer
    • PostgreSQL
    • CI/CD

  3. Frontend & Mobile Developer @Urban Media Agency

    Sep 2017 — Dec 2020

    Catania, Italy

    • Built Angular web apps, UI component libraries and Ionic mobile apps for the agency’s clients, from first screen to store build.
    • Worked with designers and marketing teams on several client projects in parallel, turning mock-ups into responsive, cross-browser interfaces against fixed go-live dates.
    • Angular
    • Ionic
    • TypeScript
    • REST API
    • HTML5
    • CSS3

  4. Frontend Developer @Bonsei

    Jan 2017 — Mar 2018

    Motta Sant’Anastasia, Catania, Italy

    • Built and customised WordPress sites and themes with HTML5, CSS3, JavaScript and PHP templates.
    • Turned graphic layouts into responsive pages and kept content editable by non-technical staff.
    • HTML5
    • CSS3
    • JavaScript
    • WordPress
    • PHP
    • MySQL

I work across the full delivery path: user interfaces, APIs, relational data and the workflows that connect them.

My experience spans Angular, React, TypeScript and RxJS on the front end; Node.js, Express, FastAPI, .NET Core and C# on the back end; PostgreSQL, SQL Server and MySQL for data.

I have delivered web, mobile and desktop applications with Ionic and Electron, put into service with Docker and CI/CD pipelines or on Windows Server, and built multi-tenant booking platforms, offline-first synchronisation, scheduled jobs, third-party integrations, query optimisation and caching. More recently I have integrated language models into products already in service: a conversational booking agent, retrieval over company documents, schema-constrained extraction.

My domain experience includes healthcare, medical imaging and operational platforms, where accuracy, reliability and clear workflows are essential.

Scope: front end, back end and relational data

Platforms: web, mobile and desktop

Core stack: Angular, React, Node.js, PostgreSQL and SQL Server

AI and LLM: RAG, AI agents, LangChain, LangGraph, OpenAI API and Ollama

Architecture: offline-first sync, scheduled jobs, integrations

Career: software development since 2017

Based in Catania, Italy — available for fully remote roles

// Technical skills

Core

  • Angular
  • React
  • TypeScript
  • Electron
  • Node.js
  • Express
  • OpenAI API
  • PostgreSQL
  • SQL Server

Also used 89

Frontend

  • Angular SSR
  • JavaScript
  • RxJS
  • HTML5
  • CSS3
  • Bootstrap/Sass
  • Tailwind
  • SurveyJS

Mobile & desktop

  • Ionic

Backend & APIs

  • Ruby on Rails
  • Ruby
  • Active Record
  • Active Storage
  • Solid Queue
  • Solid Cache
  • .NET Core
  • C#
  • Python
  • FastAPI
  • PHP
  • WordPress
  • REST APIs
  • OAuth2
  • JWT authentication
  • RBAC

AI & LLM engineering

  • AI agents
  • Multi-agent orchestration
  • Retrieval-augmented generation (RAG)
  • GraphRAG
  • Embeddings
  • Vector & hybrid search
  • Document chunking
  • Reranking
  • Function calling
  • Structured model output
  • Prompt engineering
  • Intent classification
  • Conversational AI
  • Human-in-the-loop handover
  • LLM evaluation
  • OCR

AI models & tooling

  • Anthropic API
  • Mistral AI
  • Ollama
  • LangChain
  • LangGraph
  • LlamaIndex
  • Hugging Face
  • Model Context Protocol (MCP)
  • LangSmith
  • RAGAS
  • pgvector
  • Qdrant
  • Chroma

Data

  • MySQL
  • SQLite
  • TypeORM
  • SQL query optimisation
  • Indexing
  • Caching

Cloud & delivery

  • Docker
  • IIS / Windows Server
  • PowerShell
  • Git
  • CI/CD
  • GitHub Actions

Testing & automation

  • Vitest
  • Playwright
  • Minitest
  • Puppeteer
  • Robot Framework
  • RobotJS
  • RuboCop
  • Brakeman

Architecture & integrations

  • Multi-tenant architecture
  • Scheduled processes
  • Third-party API integrations
  • OpenAPI
  • JSON Schema
  • Google APIs
  • PDF generation
  • Web Crypto API
  • IndexedDB

Medical imaging

  • DICOM
  • DICOMweb
  • Cornerstone.js
  • VTK.js
  • OHIF
  • PACS integration

// Education & training

  • Scientific high school diplomaLiceo Scientifico Albert Einstein · 2005–2010
  • Computer Engineering studies (no degree)Università degli Studi di Catania · 2010–2013
  • Course: Node.js & Express MicroservicesUdemy · 2021
  • Course: Angular & Ionic Full-Stack DevelopmentUdemy · 2020

// Languages

  • ItalianNative
  • EnglishProfessional working proficiency: advanced written, conversational spoken

// How this site is built

This site is itself one of the projects: an Angular application with server-side rendering, prerendering and a quality pipeline that checks every build. Four notes describe how it is made.

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