single-file · flagship
HR Nexus
Full HR management platform with an 8-tier role system, multi-company data isolation, real-time Firestore sync, OTP password reset, and a Leaflet branch map with auto-geocoding.
AVAILABLE FOR NEW PROJECTS · KANDY, LK
Full-stack ideas, shipped as a single deployable file.
I'm Sadith, the developer behind Miracle Data. I build HR platforms, billing systems, booking tools and desktop apps for real businesses — most of them shipped as one clean HTML file, live on the internet before the coffee's cold.
Currently buildingHR platforms, billing systems, booking tools and desktop apps
6+
Apps in production
8
Role tiers built
30+
Currencies in billing
₨0
Monthly hosting cost
HR platforms
Multi-company, role-based, real-time.
Billing systems
Multi-currency, barcode-ready, trilingual.
Booking tools
Instant quotes and guided itineraries.
Desktop apps
One JAR, nothing but a JRE required.
// explore
Where to next
Each part of the site has its own page. Start with the work, or jump to whatever you need.
Work
Six live products, filterable by what they're built with.
Open pageProcess
One file, zero build step, and why it works.
Open pageStack
What actually ships in production.
Open pageAbout
From accounting and audit to full-stack development.
Open pageHave a project in mind?
Tell me what your business needs and I'll say whether it's a weekend build or a real project.
// selected work
Products, not prototypes
Every project below is live, used by real people, and maintained. Filter by what it's built with.
6 projects
multi-file
Nexus Billing System
Production billing system with manufacturing/buying/selling flows, BOM tracking, barcode scanning, 30+ currencies, and a trilingual interface — English, Sinhala, Tamil.
single-file
Sri Lanka Tourism SPA
Instant quote builder, day-by-day itineraries, and a keyword-based FAQ chatbot.
desktop app
HR Nexus Desktop
The web platform rebuilt as a Java Swing app with a local JSON database.
Yashini & Adhithya — Wedding Site
single-fileA Kandyan-inspired digital invitation: envelope entry animation, gold vine borders, Sinhala kavi verse, and a live countdown — one HTML file, fully deployable.
Miracle Data Portfolio
multi-page SPAThis studio's own site, structured as a six-page SPA — Home, About, Skills, Projects, Experience, Contact — with a live project status feed.
// how I build
One file. Zero build step.
The philosophy behind almost everything I ship.
Scope it as one artifact
HTML, CSS and JS live in a single file wherever it makes sense. No bundler, no node_modules to deploy — just a file you can drag onto Netlify.
Firebase for anything that needs to sync
Firestore's real-time listeners give multi-user apps live updates without me hand-rolling a websocket layer.
Ship to zero-cost infrastructure
Netlify and GitHub Pages host the result for free, with custom domains where the client needs one.
Iterate live, in front of the client
Because there's no build pipeline, changes go from "can you move that button" to deployed in minutes, not a sprint.
The best architecture is the one your client's business can actually run on zero infrastructure budget — and still scale to eight role tiers when it needs to.
// toolbox
package.json, more or less
What actually ships in production, not a skills bar.
"frontend"
"architecture"single-file HTML/JS SPAs
"styling"vanilla CSS, no framework
"backend"
"runtime"Node.js + Express
"database"Firebase Firestore, sql.js
"auth"JWT, EmailJS OTP flows
"desktop"
"framework"Java Swing + FlatLaf
"serialization"Gson
"deploy"
"hosting"Netlify, GitHub Pages
"domains"GoDaddy DNS → GitHub Pages
FirebaseFirestoreNode.jsExpresssql.jsJWTEmailJSLeaflet.jsJava SwingFlatLafGsonNetlifyGitHub PagesVanilla JSFirebaseFirestoreNode.jsExpresssql.jsJWTEmailJSLeaflet.jsJava SwingFlatLafGsonNetlifyGitHub PagesVanilla JS
// developer.json
Sadith Gunasekara
Kandy, Sri Lanka
// about
From balance sheets to backend code
I started in accounting — an audit traineeship, hotel accounts, finance work at a hospitality group — before moving into development full-time. That background still shows: I'm the developer who actually understands EPF/ETF, VAT/NBT, and why your payroll system can't round the way a generic template does.
Today, Miracle Data is my freelance practice. I work directly with business owners in Sri Lanka and abroad, building the exact tool they need — not a template stretched to fit.
Now
Miracle Data — Founder & Developer
Full-stack web, Firebase platforms, Java desktop apps
Before
Finance & Audit — Oak Ray Group
Hotel accounts, financial statements, audit traineeship
// get in touch
Got an idea?
Let's ship it.
Tell me what your business needs — a booking tool, an internal dashboard, a billing system — and I'll tell you honestly whether it's a weekend build or a real project.