Skills & Technical Expertise

Tools chosen for
real product work.

Technologies demonstrated through a published Android product, production websites, authenticated backend workflows, AI-assisted features, automated tests, and practical delivery experience.

Explore the stack
React Native TypeScript Node.js PostgreSQL

Core technical domains

My primary engineering stack

Applied in projects
01

Primary product stack

Mobile & Frontend

Cross-platform mobile applications and responsive web interfaces, including navigation, reusable components, notifications, Android builds, widgets, accessibility, and user-facing product workflows.

  • React Native
  • Expo
  • Expo Router
  • TypeScript
  • JavaScript
  • React
  • HTML5
  • CSS3
  • Bootstrap
  • Responsive Design
  • Accessibility
  • Figma
Published Android product VitaStreak is available on Google Play and maintained through EAS and Google Play Console.
02

Authenticated application workflows

Backend & Data

Authentication, relational and document data, access policies, serverless functions, structured persistence, file services, and external API integrations for mobile and web products.

  • Node.js
  • REST APIs
  • Supabase
  • PostgreSQL
  • SQL
  • Authentication
  • Row Level Security
  • Edge Functions
  • Firebase Authentication
  • Cloud Firestore
  • Cloud Functions
  • Cloudinary
  • Data Modelling
Implemented product workflows Used across VitaStreak, My Inventory, and selected professional backend contributions.
03

Applied product integration

AI & Structured Data

AI-assisted product features focused on image-based extraction, structured responses, validation, secure server-side access, and reviewable user workflows rather than model training.

  • Google Gemini API
  • Structured Outputs
  • Prompt Design
  • Image-Assisted Extraction
  • Schema Validation
  • Secure API Integration
  • User Review Workflows
Two working integrations Gemini-powered workflows are implemented in VitaStreak and My Inventory.
04

Verification and production delivery

Quality, Tooling & Delivery

Runtime validation, automated testing, modular repositories, source control, builds, release checks, SEO, hosting, and operational delivery for web and mobile products.

  • Automated Testing
  • Node.js Test Runner
  • Zod
  • npm Workspaces
  • Git
  • GitHub
  • Docker
  • CI/CD Fundamentals
  • EAS
  • Google Play Console
  • SEO
  • DNS
  • HTTPS/SSL
  • Apache
  • cPanel
  • Production Deployments
75 automated tests MindGuess includes reproducible validation, seeded simulations, edge cases, and dataset consistency checks.

Evidence in practice

Where these skills are used

Published Android applicationVitaStreakReact Native · Supabase · PostgreSQL · Gemini API Tested probabilistic inference engineMindGuessTypeScript · Probability · Zod · 75 tests Professional production experienceEUC Inovação PortugalWeb Development · Product Quality · Mobile · Delivery

Engineering approach

From requirement to verified result

  1. 01
    Understand

    Translate the objective into requirements, constraints, user flows, and a clear definition of the expected result.

  2. 02
    Structure

    Separate interface, application logic, data, integrations, security boundaries, and operational concerns.

  3. 03
    Implement

    Build in readable, reviewable steps with reusable components, validation, and clear source-control history.

  4. 04
    Validate

    Run type checks, automated tests, simulations, manual review, device checks, and production verification.

Engineering foundations

Broader technical background

Programming

Academic and foundational experience with Python, Flask, Java, C, SQL, algorithms, object-oriented programming, and distributed systems.

PythonJavaCSQL

Networks & Security

Foundations in TCP/IP, network services, troubleshooting, web servers, and cybersecurity, complemented by practical DNS and HTTPS work.

TCP/IPSecurityServers

Telecommunications

Academic foundations in 5G, IoT, Bluetooth, wireless systems, and ITED/ITUR infrastructure.

5GIoTITED/ITUR

Hardware

Academic prototypes using Arduino, servomotors, ultrasonic sensing, DHT11 sensors, and Bluetooth modules.

ArduinoSensorsHC-06

Communication

Languages

PT
PortugueseNative
EN
EnglishB2 · Upper-Intermediate
ES
SpanishB2 · Upper-Intermediate

See the stack in action

Explore the products and engineering work.

View projects