Writing
All writing
Everything I have published, newest first.
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Jul 28, 2026
kielltampubolon.id
Why Quality, DCO Compliance, and Ethics Beat Volume in AI-Driven Engineering
What I learned auditing 25+ Tier-1 open-source infrastructure repos, and why I closed 25 automated pull requests instead of shipping them.
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Jul 21, 2026
kielltampubolon.id
Auditing Entra ID Accounts and Privileges Without PowerShell Dependencies
Notes on building an Entra ID account lifecycle and privilege audit that cross-references onboarding/offboarding tickets and verifies admin role boundaries.
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Jul 14, 2026
kielltampubolon.id
Automating Enterprise Phishing Triage: SPF, DKIM, DMARC, and Raw Email Extraction
How I automated phishing triage using raw .eml/.msg extraction, SPF/DKIM/DMARC header validation, and a KnowBe4 PAB/PhishER webhook pipeline.
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Jun 3, 2026
Medium ↗
I Built an AI-Powered SOC With Tools We Already Owned. Here's the Honest Version.
An honest write-up of building an AI-assisted SOC at Constellar with tools we already owned: what worked, what did not, and what I would do differently.
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Mar 17, 2026
Medium ↗
Running a Tabletop Exercise Across the Entire Organisation: A Constellar Story
What we learned about pressure, process, and people when the whole company sat down to face a simulated ransomware crisis together.
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Feb 23, 2026
Medium ↗
The Hidden Attack Surface: PDF Metadata & Information Leakage
What your PDFs reveal about your infrastructure, and how to stop that reconnaissance in C# and .NET.
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Feb 21, 2026
Medium ↗
How I Stopped Manually Reading Email Headers and Built a Phishing Analyzer That Does It For Me
A Mini-SOC automation pipeline with Microsoft Power Automate, KnowBe4 PhishER, and Freshservice that cut phishing triage from minutes per ticket to under thirty seconds.
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Sep 16, 2025
Medium ↗
From Pixels to Privacy: Using OCR + Microsoft Presidio to Redact Sensitive Data in ID Cards
A hands-on guide to detecting and redacting sensitive data like NIK and NRIC from ID cards with Tesseract OCR and Microsoft Presidio, with code and results.
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Aug 13, 2025
Medium ↗
From Pixels to Pinpoints: My Journey into OSINT Geolocation
Notes from an OSINT geolocation lecture in the SMT program: how image metadata and open map data turn pixels into precise locations, and the ethics that come with it.