// writing
Writing
Long-form technical writing on architecture, distributed systems, and biometric platforms.
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Architecting FIVUCSAS: a multi-tenant biometric authentication platform
May 5, 2026How a Marmara senior project grew into a production multi-tenant biometric platform — and the three production incidents the team learned the most from.
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Letter counts and Abjad totals: verifying a Quranic engine letter-by-letter
May 5, 2026Mizan is a scholarly-grade Quranic text engine where every count is verified against Tanzil. This is what it takes to make 172 tests pass and stay honest about reproducibility.
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Kotlin Multiplatform in anger: shipping Muhabbet across Android, iOS, and backend
May 5, 2026Muhabbet is a privacy-first Turkish messaging platform written end-to-end in Kotlin — Compose Multiplatform on mobile, Spring Boot on the backend, KMP shared module in the middle. This is what we learned shipping it.
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Replacing a 24-sheet macro Excel: how Sarnıç became a constraint-solver
May 5, 2026A Turkish exam-prep school was running 143 students, 20 teachers and 24,444 schedule entries on a 24-sheet macro-enabled Excel workbook. This is how we replaced it with a multi-tenant constraint solver.
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Hexagonal architecture in production: Share Agent, BIST, and 12 indicators
May 5, 2026Share Agent trades the Sharia-compliance index of Borsa Istanbul. The domain layer has zero external imports, the data providers are swappable, and the lesson is that hexagonal architecture earns its keep when reality changes.