JoãoSousa

João Sousa

Network & Infrastructure Engineer

Passionate about building and optimizing infrastructure at scale. Currently interning at Cisco TAC focused on server virtualization and infrastructure optimization. Dedicated to continuous learning in networking, virtualization, and emerging technologies while pursuing industry certifications. Driven to solve complex architectural challenges and contribute to robust, scalable systems.

JS

Work Experience

Technical Intern - TAC DCSV

Cisco | Sep 2025 - Present
Providing technical support for Cisco Unified Computing System (UCS) technologies as part of the Server Virtualization TAC team. Supporting complex customer environments with UCS B, C, and X series servers, UCS Central, and Intersight. Troubleshooting virtualized infrastructure issues across VMware, Hyper-V, and other hypervisor platforms to resolve customer technical challenges.

Digital Business Engineer

t_insight | Sep 2024 – Feb 2025 (During Bachelor's)
Designed and developed dynamic web applications using JavaScript, TypeScript, and ASP.NET MVC. Collaborated on full-stack solutions with emphasis on cross-platform compatibility and user experience optimization across web and email channels.

Apprentice QA Automation Engineer

Sky Portugal | Jul 2024 – Aug 2024 (Summer Internship)
Developed a Retrieval Augmented Generation (RAG) powered Slack bot to automate bug ticket triage and routing in Jira. Built Python integration with Jira and Azure OpenAI to enable intelligent ticket classification and team-based distribution. Project demonstrates advanced AI application for workflow automation and operational efficiency improvements.

MY PROJECTS

What I have built

CTF Write-ups & Web Security Labs

Web Exploitation
Python
JavaScript
OWASP
Security Research
Comprehensive collection of write-ups for Capture The Flag (CTF) challenges and PortSwigger Web Security Academy labs. Primarily focused on web exploitation techniques with detailed explanations of methodology, tools, payloads, and thought processes. Includes solutions from multiple CTF events (LIT CTF, CRHC CTF, Script25, and more) plus extensive PortSwigger lab documentation covering web vulnerabilities from fundamentals to advanced attack vectors.

ChessLab

Next.js
TypeScript
React
Tailwind CSS
PostgreSQL
Prisma
NextAuth.js
Full-stack chess opening repertoire builder and training platform (deploying soon). Enables players to construct, organize, and practice opening lines using an interactive chess board with spaced repetition learning methodology. Features secure authentication via email verification and Google OAuth, comprehensive repertoire management with branching line support, and progress tracking. Built with modern web technologies for a responsive, performant training experience.

Interactive Minigames Platform

React
TypeScript
Tailwind CSS
Cloudflare Pages
PWA
Progressive Web App designed for large-scale promotional events featuring multiple interactive minigames. Includes comprehensive administrative dashboard for real-time event management, prize inventory tracking, and player engagement analytics. Built for high-traffic retail scenarios with responsive mobile-first interface, robust state management, and intuitive controls for event staff. Deployed in premium enterprise environments with proven scalability and reliability.
Visit Web App

Network & Data Center Engineering

Python Scripting & Automation

Cybersecurity & CTF

AI Infrastructure & Tools

MY SKILLS

Technical Expertise

I specialize in network engineering, cybersecurity, and automation. My expertise spans Cisco technologies, network architecture design, and hands-on security research through CTF competitions. I'm proficient in Python for both scripting and automation tasks, enabling infrastructure-as-code practices and network automation.
I combine theoretical knowledge with practical problem-solving, continuously expanding my capabilities in emerging technologies and best practices in networking and security.

Certifications

Cisco Certified Network Professional - Data Center (CCNP DC)

In Progress - 1/2 Exams Passed
Advanced certification validating expertise in data center design, implementation, and operations. Completed DCCOR (Data Center Core) in February 2026. Currently pursuing DCAI (Data Center AI Infrastructure) to complete the certification.

Cisco Certified Network Associate Automation (CCNA Automation)

November 2025
Validated skills in network automation, scripting, API development, and infrastructure-as-code practices for modern network management.

Cisco Certified Network Associate (CCNA)

November 2025
Validated skills in network fundamentals, IP connectivity, security fundamentals, and automation.

Cisco AI Technical Practitioner (AITECH)

February 2026
Designed for technical professionals transitioning to innovation-driven roles augmented by AI. Validates expertise in AI-powered code generation, generative AI workflows, model customization, RAG implementation, and AI workflow automation and optimization.

Education

Bsc in Computer Science and Engineering

Instituto Superior TécnicoLisbon, Portugal
Comprehensive education in computer science fundamentals, software engineering, and systems design. Developed strong foundation in networking, infrastructure, and problem-solving through rigorous coursework and hands-on projects.