I'm a dynamic software engineer with over 5 years of hands-on experience building robust, scalable, and high-performance web and mobile applications. I'm passionate about crafting elegant solutions across the full technology stack — from modern frontend interfaces to efficient backend systems and DevOps practices. I'm proficient in Laravel, CodeIgniter, Express.js, NestJS, Go Fiber, React.js, and Kotlin. I thrive in fast-paced environments as a fast learner and adaptable problem-solver, consistently delivering clean, maintainable code that drives real business impact.

What I Built

This page highlights projects I've built and contributed to. For professional client work, check out my Work page.

Selected Client & Personal Projects

MK Jewelry System (ERP) & POS – End-to-end ERP and point-of-sale system for a jewelry business, built with a scalable database architecture.
BPR Dana Mandiri Services – A suite of banking services including a balance check service, a deposit agent system (web & mobile apps), a PPOB API, a collection API for mobile apps, and an OpenAPI service.
Sosialoka Ads Platform – Campaign management ads platform supporting 5+ client projects simultaneously.
e-KYC Services – SaaS platform for electronic Know Your Customer with biometric verification and identity management.
AT School – Student school monitoring application.
JTLExpress Apps – Official, Mitra, and Kurir Android apps, plus logistics dashboards for shippers and cargo systems.
Tatangga – House property management system.
Catatan UMKM – Invoicing management system.
Huniq Property Management – Property book management platform.

Open Source

You can browse my open-source work and experiments ongithub.com/Zainal21.

Muhamad Zainal Arifin

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What I Built

Selected Client & Personal Projects

Open Source