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Stevenenson/README.md

Hey, I'm Sandu Stefan 👋

I build AI agents, ship fast APIs, and reverse-engineer what's under the hood.


🧑‍💻 About Me

🎓 Economic Cybernetics, Statistics & Computer Science at ASE Bucharest (2024-2027)

Third-year student who builds AI agents and the FastAPI backends behind them, and who likes taking systems apart to see how they really work. Most of what I know I learned by shipping working tools under hackathon pressure: one problem, a deadline, and code that has to run at the demo.

  • 🤖 AI agents: tool-calling pipelines, multi-turn context, web search and human-in-the-loop approvals (PrivAI, JetSeeker)
  • ⚡ FastAPI backends: SSE streaming, webhooks, background tasks, local-first storage
  • 🔍 Reverse engineering: mapping undocumented production APIs from network traffic, sessions and polling (JetSeeker × Vola.ro)
  • 🔗 Real-world integrations: live government APIs, rate limits, caching and hardened parsing of untrusted input (InvoiceGuard × ANAF)
  • 🔐 Security by default: PII redaction before prompts leave the device, XXE-safe XML, data stays local unless it has to leave

Right now: building with AI coding agents to go from problem to shipped tool fast, and digging into what makes agents safe to trust, the point where AI becomes both a powerful tool and an attack surface.


🏆 Hackathon Highlights

🛡️ InvoiceGuard NEW

ITFest 2026, Challenge 4: verifying invoices before payment

Romania · October 24-25

Desktop app that checks every e-Factura invoice from ANAF's SPV before it gets paid. Verifies suppliers live against ANAF, catches changed IBANs, look-alike "clone" companies and duplicate invoices, and explains every verdict (Verified · Review · Blocked) in plain language for the accountant. Hardened XML parsing (XXE-safe), everything runs locally.

🔐 PrivAI

AI Agent Olympics, Milan AI Week 2026

Fiera Milano, Italy · May 13-20 · $32K+ prize pool

Privacy-first AI workspace where all data stays on-device in SQLite. Built with a team of 4 at Europe's largest AI conference. Features a privacy guard for PII redaction, autonomous agent workflows, and Gemini-powered multi-model intelligence.

✈️ JetSeeker

VibeHack Bucharest, Vola.ro AI Challenge

Bucharest, Romania · March 14-15 · 24-hour build

WhatsApp AI travel assistant that searches real flights via reverse-engineered API, analyses booking screenshots with vision LLMs, and identifies destinations from photos. Built for group chat dynamics.


⚙️ Tech Stack


📊 GitHub Stats


🗣️ Languages

🇷🇴 Romanian (Native) · 🇬🇧 English (C2) · 🇫🇷 French (B1)


💼 Open to internships, hackathons, and collaborations in cybersecurity & AI security.

Popular repositories Loading

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    Sandu Stefan - CV/Resume (LaTeX source + PDF) | Cybersecurity & AI Student @ ASE Bucharest

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    WhatsApp-native AI travel assistant with real-time flight search - Built in 24h at VibeHack Bucharest 2026 (Vola.ro AI Challenge)

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    🛡️ Aplicație desktop care verifică facturile e-Factura din SPV înainte de plată: ANAF live, IBAN schimbat, firme-clonă, dubluri · ITFest 2026

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