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Hi, I'm William Agasvari.
My craft: your servers and your apps.

AI speeds things up, craft keeps them solid — 25 years of field experience at the service of your project.

Freelance Linux systems administrator and web & AI architect, based in Paris. 25 years of experience in web development, server administration and hosting. For the last 3 years, I've been integrating generative AI (Claude, Cursor) to deliver faster — without sacrificing quality.

25 years in the field
100+ projects delivered
5/5 SuperMalter · 71 reviews
< 1h Reply · business hours
My approach

Rock-solid infra. POC in days.
Documented deliveries.

Linux Systems Admin

Debian / Ubuntu, Plesk, Proxmox, network security, 24/7 managed services. < 1h response on critical incidents. Several hundred servers in production, from IPTV clusters to shared hosting.

Web & AI Apps Architect

Laravel, Node.js, Python, AI agents (OpenAI Realtime), Stripe e-commerce, Asterisk VoIP. Method: Analysis → POC → Architecture → Iterative dev → Documented delivery.

Radio host

I host the Cyberculture show on Radio Cause Commune (93.1 FM / DAB+ Paris). Cybersecurity, digital culture, open-source software, AI — the topics that move the craft forward.

My method

Every mission is structured around short milestones, a clean Git repo and transparent communication. I don't ship a pile of code: I deliver an operational product, documented and maintainable by others.

  • Initial scoping: perimeter, constraints, estimates
  • Fast POC before commitment (days, not weeks)
  • Solid architecture: modular, facade pattern, clean interfaces
  • Iterative development with regular demos
  • Documented delivery and post-delivery support

How we work together

I adapt to your team, your urgency and your existing stack — solo, embedded in a team, on a time-and-materials or fixed-price basis.

  • Day rate on request · Time-and-materials or fixed-price depending on scope
  • Remote or on-site within Paris + 50 km
  • Short missions (1 day) or long ones (10+ years for D4.FR)
  • Billing via Malt (secured) or direct (SIRET)
  • NDA and total discretion on your projects
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Background

25 years in the field.

2023 — Today

Generative AI integration (vibe coding)

Piloting Claude, Cursor and the OpenAI Realtime API to deliver web apps in weeks. Calixo (ticketing SaaS, 3 weeks), Voxa Center (VoIP + AI agent), Vaultly (MVP in 1 day).

2016 — Today

D4.FR hosting infrastructure (10+ years)

Running shared hosting and dedicated server infrastructure for pro clients with enhanced security requirements. Plesk, WHMCS, Proxmox VE, OpenVPN, tested DRP. Several hundred servers in production.

2017 — Today

Cyberculture show on Radio Cause Commune

Hosting the Cyberculture show on the Parisian community radio Cause Commune (93.1 FM, DAB+). Topics: cybersecurity, digital culture, open-source software, AI.

2000 — 2008

Technical Lead at Anotherlight (8 years)

Web hosting provider & dedicated servers. Led a team of 4, managed 25 Linux servers in datacenters (RedBus, Telehouse2, OVH). In-house client Web Control Panel, BtoC and BtoB environments, full LAMP mastery + automations.

Contact

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Location

Paris, France
on-site up to 50 km

Contact

Contact form

Malt

SuperMalter profile

Radio

Cyberculture · 93.1 FM

LinkedIn

View profile

GitHub

@grevoka

Contact

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Emergency, managed services, custom app or AI agent — I respond within 1h.

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