Web Developer & Systems Engineer · Indonesia
I build and operate web applications end to end — internal business systems for asset, archive, and operations management, plus developer tooling for WhatsApp messaging, real-time market data, and document processing. Everything runs on a self-hosted stack I maintain myself.
I'm a full-stack developer based in Indonesia, operating under the name Z-Labs. My day-to-day work is split between two areas.
The first is enterprise internal systems — web applications for organizations that manage a physical operation: asset tracking, digital archiving, vehicle fleets, meeting facilities, and delivery orders. These are Laravel and PHP applications with role-based access, document workflows, and reporting.
The second is tooling and infrastructure — a WhatsApp messaging gateway, real-time market-data dashboards, browser-based PDF utilities, and self-hosted automation. This side is built with Node.js, Python, and Docker, and includes reverse-engineering work against mobile and web APIs.
I handle the full lifecycle myself: requirements, backend, frontend, deployment, and long-term maintenance on my own Linux servers.
Technologies I work with regularly, grouped by area of responsibility.
Selected systems I've built and deployed. Links point to live deployments where public.
Multi-session WhatsApp platform: a Laravel management panel backed by a Node.js service built on Baileys. Handles session lifecycle, QR and pairing-code login, scheduled and view-once messages, bot-to-human handoff, and per-session API tokens.
z-labs.web.idLive trading dashboard with a React frontend over a Python WebSocket/HTTP bridge to a market-data feed. Shows price charts, orderbook depth, company financials, analyst ratings, broker activity, and foreign-vs-domestic flow.
ws-sl.z-labs.web.idClient-side utility that splits a PDF by a target output file size. Runs entirely in the browser with no upload.
pdf.zeldinenv.onlinePrivacy-focused PDF editor running entirely in the browser — merging, image insertion, and encryption without files leaving the client.
pdf.z-labs.web.idContainerized n8n instance for workflow automation and webhooks, deployed and maintained on my own server.
n8n.zeldinenv.onlineRoundcube webmail deployed on a self-managed mail stack for organizational email access.
mailz.zeldinenv.onlineFull asset lifecycle: QR-code onboarding with required photos and procurement documents, movement tracking, maintenance scheduling, depreciation, PIN-protected documents, and QR label printing with role-based access.
aset.desari.co.idCorporate document archive with division-based classification, multi-word search, preview, PDF/Excel export, multi-level loan approval with digital receipts, and full backup/restore.
arsip.zeldinenv.onlineInternal system for a General Affairs division: operational vehicle monitoring, registration and tax expiry tracking, service scheduling, and modular administration tooling built for continuous development.
umum.desari.co.idSales-invoice / delivery-order system shipped as an installable Progressive Web App with offline caching, dark mode, WCAG AA accessibility, and mobile-first navigation.
sf.zeldinenv.onlineSystem for meeting-facility requests: room booking with schedule-clash validation, facility catalog with unit pricing, automatic consumption calculation by meeting duration, cost realization, and reporting.
ppfr.desari.co.idDedicated asset content-management system for organization-wide asset records and reporting.
assetcw.zeldinenv.onlineA selection of public repositories on my GitHub profile.
Google dorking helper.
Automated Microsoft 365 Education account provisioning.
Twibbon (campaign frame) manager application.
Convert PUBG Mobile player IDs to names.
Shared-printer connection fixer.
Moodle account testing utility.
Reach me by email for freelance or full-time opportunities, or follow my work on GitHub.