Build real things
Billing engines, router automation, coin-slot hardware — software that handles real money and real users.
Open to freelance work & collaborations
Wilson Villanueva.
Self-taught developer — building FairLink, full-stack platforms & network tooling.
~/projectbaluga $ Developer
I build full-stack web platforms, network tooling, and the occasional piece of hardware firmware. My main project is FairLink — an ISP & hotspot management system on the MERN stack and Docker. This site shows what I've made so far.
- 2Projects shipped
- 15+Technologies
- 6Docker services
Learned by
building
I'm Wilson. Most of my time goes into FairLink — an ISP & hotspot management platform with billing, subscriber records, voucher generation, MikroTik router control, and a kiosk system, built on the MERN stack and Docker.
Alongside it I've worked on an Android companion app, ESP8266 firmware, and a Windows anti-cheat experiment called SafePlay. I don't have an IT degree — everything on this page came from building these projects and figuring things out along the way.
Tools I use most
- React & Node.js
- MongoDB & Docker
- MikroTik RouterOS
- FreeRADIUS & WireGuard
- C# / .NET (WPF)
- C++ & ESP8266
Keep it running
Billing cycles, router syncs, kiosk sessions — the platform has to run every day on its own.
Own the whole stack
From React components to RouterOS scripts to ESP8266 firmware — I'd rather understand every layer.
What I work with
Web & APIs
The stack FairLink is built on — frontend to realtime backend.
- React (Vite)
- REST APIs
- Socket.io
- MongoDB / Mongoose
- JWT auth
- Helmet
- Rate limiting
Languages
JavaScript first; C# and C++ when needed.
- JavaScript
- C# (.NET 8)
- C++ (Arduino)
DevOps
How I deploy and run things.
- Docker Compose
- Nginx
- Git / GitHub
Networking
Routing, wireless, and real-world fiber deployment — the environment FairLink runs in.
- MikroTik RouterOS v6 / v7
- Ubiquiti
- Fiber deployment
- PPPoE / IPoE
- Bandwidth mgmt
- FreeRADIUS
- WireGuard VPN
Hardware & IoT
Firmware, assembly, and cabling.
- System assembly
- ESP8266 firmware
- Network cabling
Platforms & Testing
Where my projects run, and how I test them.
- Linux
- Windows Server
- Android / iOS
- Jest
- Vitest
- Supertest
Things I've shipped
Case 01 — Main project · Full-stack platform
Private repo · walkthrough on request
FairLink
ISP & Hotspot Management System
At its core, FairLink is an ISP & hotspot management system on the MERN stack and Docker — subscriber billing, a CRM with real-time support chat and ticketing, and MikroTik (PPPoE/IPoE) + FreeRADIUS network control. On top of that I built a comprehensive internet-café / workstation add-on — coin-operated PC sessions, a canteen point-of-sale, and a print-to-cashier queue — so the whole business runs from one platform, with companion apps for Android, iOS, and Windows.
- 6Docker services
- 32Data models
- 64UI components
- 39Backend tests
- 11Dashboard modules
Core ISP platform
Billing & Cycles
Anniversary billing with a full cycle-change history, opt-in month-end anchor mode, pro-rated rebates for downtime, partial payments, and PDF statements of account.
Dashboard & CRM
Subscriber lifecycle, financial analytics, issue tracking, and a live Leaflet map of field staff.
Live Chat
Real-time messaging over Socket.io — subscribers chat with support, conversations thread onto tickets, and field technicians coordinate with the office, synced across the dashboard and companion apps.
Hotspot & Vouchers
FreeRADIUS auth delegated to the API, a captive portal, bulk voucher generation, live sessions, and CoA / disconnect.
Router Control
MikroTik API for PPPoE secrets and IPoE (DHCP lease, simple queue, IP binding), with encrypted credentials and health checks.
Support & Tickets
Ticket workflow with comments, assignment, and resolution tracking, with live status updates over Socket.io and linked field-technician reports.
Inventory & Deployments
Barcode / serial stock tracking with audit history, equipment deployments to subscribers, and a technician stock-request workflow.
Field Ops & SOS
Live staff GPS tracking on a Leaflet map, subscriber SOS mode with grace windows, and real-time online presence.
Companion Apps
Native Android (Java) and iOS (Swift) WebView wrappers around the dashboard, with GPS, camera, and file-upload bridges.
Security
JWT auth, role-based permissions, field-level encryption at rest, CSRF tokens, and rate-limited login.
Add-on Café / workstation
Coin-Op Sessions
Minute-based desktop accounts and sessions with a per-minute timer, ESP8266 coin-acceptor top-ups, thermal-printed vouchers, and a Windows .NET / WPF lockscreen that locks each PC.
Canteen POS
An Order-based point-of-sale wired to inventory stock movements, served to both staff and the self-service kiosk.
Print to Cashier
Kiosk Ctrl+P jobs land straight in the cashier's print queue — preview, print, then mark collected, with per-page rates.
Rewards & Leaderboard
A weekly café leaderboard with automated rewards and referral bonuses to keep regulars coming back.
How it works
Architecture
Six Docker services on an isolated bridge network — a React/Nginx frontend, a localhost-bound Express API, MongoDB, FreeRADIUS, a WireGuard VPN, and a read-only Docker socket proxy.
Real-time
Socket.io keeps live chat, technician GPS, ticket activity, kiosk sessions, and SOS status in sync across every device.
Automation
Cron jobs handle the daily billing accrual, overdue-subscriber syncing to MikroTik, payment deadlines, per-minute kiosk timers, and weekly café rewards.
Networking
Talks to MikroTik over its API for both PPPoE and IPoE, delegates RADIUS auth and accounting to the backend, and reaches routers behind CGNAT through the built-in WireGuard VPN.
$ docker compose ps
NAMESERVICESTATUS
fairlink-webreact-spaup
fairlink-apiexpress-apiup
fairlink-dbmongodbup
fairlink-radiusfreeradiusup
fairlink-vpnwireguardup
fairlink-proxysocket-proxyup
Case 02 — Side project · Systems & security
GitHub
SafePlay
Anti-Cheat Tool for Online Games
A side project exploring how anti-cheat tools work. It's a Windows DLL for Ragnarok Online clients that serves a trusted configuration from memory, verifies game files, and checks for known cheat tools — paired with a launcher that makes sure the game starts clean. Written in C++.
Configuration
Keeps game server settings stored safely in the DLL so they can't be easily changed.
File Check
Verifies game files haven't been tampered with before allowing the game to start.
File Patching
Intercepts file access attempts to protect configuration from being modified.
Cheat Detection
Regularly checks for known cheat tools running in the background.
Protected Launch
Game only runs through a special launcher to ensure protections are in place.
Notifications
Shows the player what's blocking them if a cheat tool is detected.
How I build
-
01
Understand
Start with the actual problem — how subscribers pay, how routers behave, how people really work day to day.
-
02
Prototype first
Get a rough version running fast, with AI as a pair programmer. Cheap to throw away, quick to learn from.
-
03
Build end to end
Frontend, API, database, networking — even firmware when needed. One coherent system, not scattered pieces.
-
04
Ship & iterate
Dockerized deploys, tests where they matter most, then keep refining from real usage.
Have a project?
Let's talk.
I'm open to freelance work and collaborations — web apps, network projects, or anything interesting. If you think I can help, send me a message.