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JozefKovalcin/README.md

Jozef Kovalcin

Computer Networks MSc student focused on networking, cybersecurity, secure communication, technical support, and practical full-stack systems.

Core Skills

  • Networking: CCNA, TCP/IP, routing and switching fundamentals, secure communication
  • Security: authentication, encryption concepts, security limitations, safe handling of secrets
  • Systems: Linux, Windows, C, sockets, troubleshooting
  • Web and cloud: TypeScript, React, Next.js, Docker, Firebase, PostgreSQL, SQL
  • Delivery: Git, GitHub Actions, documentation, reproducible local setup

Featured Projects

Secure TCP File Transfer with SAKE

secure-file-transfer-sake

Academic C implementation of a secure file transfer tool using a SAKE-inspired authenticated exchange, password-based key derivation, session keys, encrypted chunks, acknowledgements, and key rotation. The repository documents its cryptographic limitations and has not been independently audited.

SportBuddy

sportbuddy-fullstack-ai

Full-stack team project for organizing local sports activities, with activity discovery, authentication, profiles, chat, notifications, Dockerized local setup, PostgreSQL/Prisma, and AI-assisted search/activity creation. The project reached the Top 20 at Zive IT projekty 2026.

Workout Progress Tracking PWA

workout-progress-tracking-pwa

Compact React/TypeScript PWA for workout tracking, top sets, progress trends, local demo mode, optional Firebase mode, and conservative recommendation logic. It includes automated tests, Firebase integration, and documented local and cloud workflows.

Certifications

  • Cisco Certified Network Associate (CCNA)

Contact

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  1. workout-progress-tracking-pwa workout-progress-tracking-pwa Public

    Personal PWA for training, bodyweight and calorie tracking with Firebase, offline support and tests.

    TypeScript

  2. secure-file-transfer-sake secure-file-transfer-sake Public

    Encrypted TCP file transfer in C using a SAKE-inspired authenticated key exchange, Argon2, ChaCha20-Poly1305 and key rotation.

    C

  3. sportbuddy-fullstack-ai sportbuddy-fullstack-ai Public

    Full-stack sports activity matching platform with Next.js, PostgreSQL, Prisma, Docker and AI-assisted search.

    TypeScript