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Foto de Claudio Mendonça

Software Engineer · Back-end & Cybersecurity

I build APIs and back-end systems with Java, Spring and Python, with security designed in from day one.

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01 About

From the factory floor to secure APIs

I’m a software engineer focused on back-end and cybersecurity. I develop REST APIs with Java and Spring Boot and services in Python, integrate artificial intelligence into business processes with RAG agents, and apply security across the entire development lifecycle, with penetration testing, WAF protection and secure-by-default code. My experience in industry, from maintenance to SCADA supervisory systems, taught me to deliver reliable solutions for operations that cannot stop.

  • 34+Featured projects
  • 17CTF flags captured
  • 3Professional recommendations
  • Java
  • Spring Boot
  • Python
  • Flask
  • React
  • JavaScript
  • Docker
  • REST APIs
  • SQL
  • AI · RAG
  • Pentest
  • WAF · ModSecurity
  • SCADA
  • PowerShell
  • Git

02 Projects

Check out a few of my recent projects.

Keep scrolling to explore

01

PROTEGER-NR1 EPT

Web system for identifying, recording and preventing psychosocial risks (NR-1) in vocational education institutions, using the Karasek and COPSOQ instruments. Anonymous surveys, k-anonymized results with risk maps, action plans and optional AI features.

  • React
  • Flask
  • PostgreSQL
View project
02

Argos SCADA

A robust and flexible system for Supervisory Control and Data Acquisition (SCADA), featuring real-time monitoring, customizable HMI interfaces, and support for multiple industrial communication protocols.

  • SCADA
  • HMI
  • Real-time
View project
03

AI Agent with RAG - BimBam Buy

AI agent that answers questions about a fictional e-commerce's policies using only its internal documents. FAISS retrieval, support for OpenAI, Gemini and Cohere, and a similarity threshold that refuses off-topic questions without calling the LLM.

  • Python
  • RAG
  • Streamlit
View project
04

Cybersecurity Training - Module 1

Simulation of a segmented corporate network using Docker, representing a fictitious company with different subnets, workstations, servers and personal devices.

  • Docker
  • Networking
  • Cybersecurity
View project
05

Cybersecurity Training - Module 2

Practical lab implementing a ModSecurity Web Application Firewall (WAF) in a Docker containerized environment, demonstrating protection against SQL Injection and XSS attacks on the DVWA application.

  • Docker
  • WAF
  • ModSecurity
View project
06

Pentest Report - CTF Final Challenge

Complete penetration testing on a web application, capturing 17 flags in critical vulnerabilities: SQL Injection, XSS, access control flaws and credential exposure.

  • Pentest
  • SQL Injection
  • XSS
View project
07

Kensei AI Foundations

Eight-week hands-on track on AI, data and automation: Python from scratch, data analysis with Pandas, interactive dashboards and AI APIs, building a portfolio of real projects.

  • Python
  • Pandas
  • AI
View project
08

AI Agents Immersion - Oracle ONE

Five-day journey building AI agents: RAG ingestion with embeddings and a vector store, an agent with memory that queries MySQL, and a Telegram integration for real automation.

  • n8n
  • RAG
  • Telegram
View project
See all 34 projects, with details

03 Testimonials

What people say about my work

Claudio is an excellent professional, having delivered a highly praised performance during the time I worked at Parex, and I had the opportunity to observe his day-to-day activities. Based on that experience, it is with pleasure that I provide this recommendation.
Paulo CesarManaging Partner · PVP Comercio e Representações EIRELI
Claudio is an exemplary professional committed to results, with good teamwork skills, strong synergy and deep knowledge in the IT field, Excel, AutoCAD among others. Highly recommended, a very skilled professional.
Rogerio Martins SilvaMaintenance Manager · Sika
Claudio is a very skilled professional. I recommend this partner because I trust in his abilities to provide coherent solutions to difficult demands! Claudio has my full support.
Humberto SantanaFounder · Engenheiro Consultor Ltda

04 Contact

Let’s build something together.

Open to back-end, security and AI projects, as a full-time role or freelance.

contato@claudiomendonca.eng.br