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CesarPetrescu/README.md

Cesar Petrescu

Systems & AI Infrastructure

Systems and infrastructure work at Romania's national broadcaster, plus a small hosting and AI company on the side (PhotonSpark).

Portfolio PhotonSpark LinkedIn Email


> whoami

πŸ“ Bucharest, Romania
πŸŽ“ CS @ Politehnica Bucharest (UPB ACS CTI)
πŸ’Ό Sysadmin @ RADIOCOM Β· CTO & Founder @ PhotonSpark (AS216249)
🎯 Targeting SRE, DevOps, and Infrastructure roles

I build software for the web, iOS, Android, and Wear OS smart watches, and I run a small home network and lab to keep learning.

Day to day, I administer Linux servers and Cisco networking gear at work, and I spend most of my side-project time on a self-hosted AI assistant (chat, voice, and a coding helper), an email service, and a small web-hosting platform.


> experience

Role Company Period
System Administrator RADIOCOM - Romania's national broadcaster Sep 2023 β†’ Present
CTO & Founder PhotonSpark (AS216249) Jan 2022 β†’ Present
Network Administrator Five Cyber Host Security Oct 2022 β†’ Jan 2023

@ RADIOCOM: Helped deploy a VPLS network linking a client's offices into one L2 domain, with redundant failover paths. Built the internal web app the NOC and Call Center teams use daily for customer records, support tickets, and contracts. General Linux/Windows server and Cisco network administration, plus automated backups.

@ PhotonSpark: Run the infrastructure end to end: an email service, a Kubernetes-based web-hosting platform, highly available Ceph storage, and a self-hosted AI assistant. Covered by Innovation Labs, ZF.ro, and Euronews.

@ Five Cyber Host: Day-to-day Linux system and network administration.


> selected-work

Project Type What it does
CDX AI platform A self-hosted AI assistant you can chat with, talk to, or ask for help with code. Works on the web, phones, and smart watches.
Distributed Mail Infrastructure The email service behind PhotonSpark. Sends and receives mail reliably and can be updated without interrupting users.
Sparkboarding Platform Turns a company's internal documents into a searchable knowledge base that answers questions and links back to the source.
Intranet Ops Suite Internal product The customer and ticketing tool the NOC and service teams at RADIOCOM use day to day. (private code)
SparkAI Canvas πŸ₯‡ Cursor Hackathon A brainstorming tool where you move ideas around on a canvas and talk to them out loud.
AutoLLama MLOps A single command that sets up and runs an open-source large language model on your own machine.
Even Notes Wearable Note-taking for Even G2 smart glasses, with a web dashboard for managing them.
Web Hosting Platform Platform engineering A self-service hosting panel for small sites. Users get a domain, HTTPS, and one-click rollback, all running on Kubernetes.
Robot Maze Solver πŸ₯ˆ HARD & SOFT 2025 A Raspberry Pi robot that solves mazes using a camera and an AI model running on a server it reaches over a secure tunnel. (not public)

> competitions

πŸ₯‡ SparkAI Canvas        - Cursor Hackathon Bucharest 2025
πŸ₯‡ AI onboarding app     - Innovation Labs CyberHack 2024
πŸ₯ˆ AI homework checker   - EESTEC Olympics 2024
πŸ₯ˆ Robot maze solver     - HARD & SOFT 2025
πŸ… Applied CS (5th)      - AcadNet Olympiad 2023 (National)

> volunteering

CCNA Instructor @ Hackademy, Faculty of Automatic Control and Computers (Oct 2023 β†’ Present)

Teach basic networking and hands-on labs in Cisco Packet Tracer. Also built the two small sites the club uses for sign-ups and event management: hackademy.ro and awg.sprk.ro.


> security-research

Google VRP: Permissions bypass (Jun 2025)

Found a way that someone without the right permissions could use Google's Generative Language API to pull transcripts of Members-only and Premium YouTube videos, and reported it to Google through their Vulnerability Reward Program.


> tech --stack

Infrastructure & Networking

AI / ML

Languages & Frameworks

Data & Services


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