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Available for systems work Malaysia / Remote

// Razin Hakim · rawzeens

I build the backend spine of real products.

Business systems, APIs, dashboards, integrations, and IoT platforms. I handle the database, logic, interfaces, and launch details so the product works when real users and real data show up.

See selected work Discuss a build
Core lane
Full-stack
Strongest fit
Systems + IoT
Base
Malaysia
Availability
Remote

Positioning

The useful middle: senior enough to design the backend properly, hands-on enough to build the UI, and comfortable enough with hardware to make physical devices talk to software.

Best project fit

  • Internal tools replacing messy spreadsheets.
  • IoT dashboards with real device data.
  • PHP/MySQL systems that need cleanup or scale.

// Inventory

Selected work

Stronger data, clearer categories, and actual implementation context. Use the hotbar to filter by project type.

ERP / CRM

Private production system

R4XN ERP Operating System

Private operating system for handling leads, quotations, invoices, tasks, project pages, and internal content from one PHP/MySQL admin surface.

Role

Product owner, backend, database, admin UI

Stack

PHP PDO MySQL Tailwind Auth CSP

What it proves

  • Lead-to-invoice workflow in one place
  • Reusable CMS blocks for project pages
  • Private by design, built for daily operations

IoT / GPS

Public demo

Live Tracking & Monitoring System

Device tracking platform with GPS ingestion, live Leaflet maps, geofence rules, device management, and alerts when a tracked unit exits a polygon or radius zone.

Role

Firmware, backend API, database, dashboard

Stack

ESP8266 GPS PHP MySQL Leaflet Email alerts

What it proves

  • Live location history by device
  • Polygon and radius geofencing
  • Admin controls for devices and zones

IoT / Energy

Public demo

Smart Home Energy Monitoring Dashboard

Energy monitoring dashboard with authenticated devices, ingestion keys, reading history, cost projection, CO2 estimates, and PZEM-004T firmware support.

Role

Firmware, API, dashboard, data model

Stack

ESP32 PZEM-004T PHP MySQL Chart.js PWA

What it proves

  • Real-time power and cost readings
  • Device key regeneration flow
  • Historical usage views

IoT / Automation

Public demo

Smart Home Application

Home automation controller for relay-based devices, rooms, scenes, and scheduling, designed around simple device operations instead of heavy smart-home overhead.

Role

Backend, device logic, app interface

Stack

PHP MQTT Relay modules MySQL Vanilla JS

What it proves

  • Room-based device grouping
  • Scene and schedule model
  • Practical controls for low-cost hardware

Booking System

Demo systems

Appointment & Reservation Engines

Reusable booking flows for clinics, services, events, branches, staff schedules, payment confirmation, admin check-in, and customer self-service.

Role

Schema design, booking logic, admin workflows

Stack

PHP MySQL Sessions Admin CRUD Payment flow

What it proves

  • Slot and staff availability rules
  • Customer confirmation pages
  • Admin dashboards for daily operations

Website Portfolio

Public

R4XN TECH Demo Library

A growing library of website concepts across clinics, ecommerce, construction, dashboards, portfolios, pet adoption, cafes, gardens, spas, and SaaS layouts.

Role

Frontend implementation, responsive UI, content system

Stack

HTML Tailwind JavaScript PHP scanner SEO metadata

What it proves

  • Filterable project catalogue
  • Fast demo previews
  • Reusable sales assets for client pitches

Developer Tool

Public tool

PNG to WebP Converter

Small conversion utility for turning uploaded PNG images into optimized WebP assets, with upload handling and generated output management.

Role

Tool design, upload flow, backend conversion

Stack

PHP Image handling SQLite/MySQL File uploads

What it proves

  • Faster asset preparation
  • Cleaner image delivery workflow
  • Simple utility UI

POS / Offline App

Prototype

Browser POS Prototype

Point-of-sale prototype with products, orders, customers, inventory screens, sync modules, and a local-first browser app structure.

Role

Frontend app architecture, API shape, data screens

Stack

JavaScript IndexedDB PHP API HTML Service worker

What it proves

  • POS, product, order, customer screens
  • Local persistence foundation
  • Sync-ready module boundaries

// Capabilities

What I can own

Not every project needs a giant team. These are the parts I can take from rough requirement to usable production feature.

Backend architecture

API design, auth, sessions, validation, webhooks, and clean service boundaries.

Database design

MySQL schemas for bookings, devices, invoices, dashboards, content, and reporting.

IoT delivery

ESP8266/ESP32 firmware, device keys, sensor ingestion, GPS, MQTT, and dashboards.

Admin systems

CRUD-heavy internal tools with role-aware screens, logs, filters, and daily workflows.

Frontend implementation

Responsive Tailwind/PHP interfaces with practical UX for real users and operators.

Launch hardening

Routing, CSP, security headers, service workers, caching, metadata, and maintenance.

// Crafting recipe

Clear scope, practical build, less theatre.

1. Map

Entities, permissions, states, edge cases.

2. Build

Schema, API, auth, screens, validation.

3. Harden

Real data, error states, launch details.

Result

Shipped system, ready for real users.

// Contact

Need a system built?

Send the workflow, the problem, or the ugly spreadsheet. I will help turn it into something a team can actually use.

WhatsApp Email