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REPRESENT

CYBERSECURITY · IT CONSULTANT · IT AUDIT

MUHAMMAD
ABIYYU
RAHMAN

I help small businesses grow into something modern, easy, and safe to run. Systems built to fit, not just to impress.

Portrait of Abiyyu Rahman

ABOUT ME

I care more about how a system holds up over time than how impressive it looks on paper.

My work sits where system architecture, security, and governance meet. Not just building software, but making sure it can be trusted with real data and real consequences once it's live.

I've built and deployed production systems for companies handling sensitive operations. Role-based access control, audit trails, and segregation of duties aren't afterthoughts I bolt on later. They're part of how I design from the start. From ERP systems coordinating a dozen roles and approval chains, to multi-outlet retail platforms managing access at the data layer, the common thread is the same: a system that fails quietly is worse than one that fails loudly.

Good software isn't defined by its feature list. It's defined by whether the people who depend on it can trust it.

Core Expertise
  • System Architecture & Design
  • Secure System Development
  • IT Audit & Access Governance
  • Full Stack Development
  • Business Process Digitalization
  • Cloud Infrastructure & Deployment
Certifications
Credential

Google Cybersecurity Professional Certificate

Google, via Coursera

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Credential

Google AI Professional Certificate

Google, via Coursera

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Credential

Google Data Analytics Professional Certificate

Google, via Coursera

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Credential

CISA: Certified Information Systems Auditor (Specialization Certificate)

Packt, via Coursera

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Gallery

WHY I DO THIS

What drives the way I build, and who it's for.

I got into this because too many small businesses get left behind by technology meant to help them.

Most owners I meet don't need the most powerful system out there. They need something that fits: easy enough for their team to actually use, reliable enough that they stop worrying about it, and secure enough that growth doesn't come with hidden risk.

What I care about goes beyond just running the business better. It's also how that business shows up to the people it serves, how a customer feels trying it out for the first time, how easy it is to come back, how much confidence a system gives the people who depend on it every day. A system is only as good as how well it holds up once real people, customers and staff alike, actually rely on it.

So when I build something, the goal isn't to make it look sophisticated. It's to make it work well enough that the owner stops thinking about the system and starts thinking about the business and the people it's for again. That's what modern should feel like: simple, a little enjoyable even, and safe enough not to worry about.

MY EXPERIENCE

Professional journey across telecommunications, infrastructure, and intelligent software systems.

distribusi & sales

Bunyamin Kalsel — Distribusi & Sales Lapangan

Masalah: Sales lapangan tidak terpantau, dan laporan penjualan baru bisa dilihat owner setelah disusun manual — lambat dan sering telat untuk ambil keputusan.

Solusi: Sistem check-in berbasis lokasi yang langsung mencatat produk dan jumlah terjual di setiap kunjungan, lalu diolah otomatis jadi skor performa per sales. Owner bahkan bisa langsung tanya ke asisten AI dan dapat jawaban real-time, tanpa buka laporan.

Hasil: Jutaan unit produk tercatat dari puluhan ribu kunjungan lapangan dalam beberapa bulan operasional, dengan tingkat konversi toko di atas 40% — kini berjalan di 2+ wilayah dengan akses berjenjang untuk 5 level pengguna (dari sales sampai owner).

Teknis: Dibangun dengan arsitektur web modern, keamanan diterapkan di dua lapis — tampilan dan sistem di baliknya — jadi tidak bisa ditembus hanya dengan tahu alamat halamannya.

retail pos

Ami Ali POS — Retail Parfum Multi-Outlet

Masalah: Bisnis parfum dengan banyak cabang butuh sistem kasir yang cepat, tapi tetap bisa mengatur siapa boleh akses apa — owner, supervisor, dan kasir punya kebutuhan berbeda.

Solusi: Sistem kasir multi-cabang di mana hak akses tiap peran diatur langsung dari satu panel, bisa disesuaikan kapan saja tanpa perlu ubah aplikasi — sambil proses di kasir (scan barcode, jual curah, member/poin) tetap simpel dan cepat.

Hasil: Mengelola ribuan produk dari puluhan merek berbeda, tersebar di 10 cabang, dengan stok tiap cabang terlacak real-time dan riwayat aktivitas tercatat otomatis untuk keperluan audit.

Teknis: Setiap aksi user (masuk/keluar akun, perubahan akses) langsung berlaku ke seluruh sistem tanpa jeda, dan riwayat aktivitas tersimpan otomatis untuk pelacakan.

sdm & audit

SIMPEG — Pemetaan SDM (PLN Nusantara Power)

Masalah: Data karyawan dari beberapa perusahaan mitra tersebar di banyak file terpisah, rawan salah input, dan tidak ada batasan — siapa pun yang pegang filenya bisa lihat data karyawan perusahaan lain.

Solusi: Sistem SDM terpusat dengan dua tingkat akses (admin pusat bisa lihat semua, admin perusahaan hanya bisa lihat datanya sendiri), plus fitur import data dari Excel yang otomatis mengecek kesalahan sebelum data masuk sistem — jadi ratusan data karyawan bisa dimasukkan sekaligus tanpa entri satu-satu.

Hasil: Mengelola data karyawan dari beberapa perusahaan mitra dengan validasi berlapis yang menekan kesalahan input, dan sudah berjalan di lingkungan kerja nyata (bukan sekadar uji coba).

Teknis: Setiap login diverifikasi dan kata sandi disimpan terenkripsi. Batasan akses ditegakkan di level data, bukan cuma tampilan — jadi admin satu perusahaan secara teknis tidak bisa membuka data perusahaan lain walau mencoba mengakali alamat halaman.

erp distribusi

AJB — Distribusi BBM

Masalah: Proses distribusi BBM (dari pemesanan sampai pembayaran) melibatkan banyak peran berbeda dan rawan pelanggaran prosedur kalau dikerjakan manual — misalnya barang keluar gudang tanpa dokumen sah, atau satu tagihan dibayar dua kali.

Solusi: Sistem ERP yang menegakkan prosedur kerja secara otomatis di setiap tahap (pemesanan → pengiriman → serah terima → tagihan → pembayaran), termasuk aturan "yang buat transaksi tidak boleh yang verifikasi transaksinya sendiri" dan persetujuan berlapis untuk transaksi besar — bisa diakses dari HP maupun komputer dalam satu aplikasi.

Hasil: Mengelola sebelas modul operasional penuh dengan akses granular untuk hampir 20 peran berbeda, persetujuan otomatis berjenjang untuk transaksi bernilai besar, dan seluruh aktivitas penting tercatat otomatis untuk audit.

Teknis: Aturan bisnis (seperti "dokumen pengiriman hanya sah jika pesanan sudah disetujui") ditegakkan di sistem inti, bukan cuma di tampilan formulir — jadi tidak bisa dilewati meski seseorang mencoba mengakali tampilan aplikasi.

GET IN
TOUCH

If your business is ready to grow into something more modern,or you're not sure your systems are as safe as they should be, let's talk. No pressure, just a conversation about what would actually help.

Philosophy

Ship things that work.

Fix things that don't.

Good enough to use. Built to be efficient.

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