https://blog.ertugrulkara.com/blog Technical articles and summaries by Ertugrul Kara. Full pieces are published on Medium. en https://medium.com/the-syntax-hub/coding-agents-are-fast-architecture-is-still-slow-a135080bd6c6?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/a135080bd6c6 Sat, 01 Aug 2026 21:58:58 GMT An agent can build the wrong system faster than your team can understand it. Speed helps only after you define the right boundaries. https://medium.com/the-syntax-hub/acme-dns-01-explained-without-the-jargon-7d377df53e48?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/7d377df53e48 Fri, 31 Jul 2026 06:48:06 GMT You add one temporary DNS record. A Certificate Authority checks it. That small exchange proves that you control the domain. https://medium.com/the-syntax-hub/the-one-shot-coding-demo-is-lying-to-you-63c93ecf6c68?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/63c93ecf6c68 Thu, 30 Jul 2026 05:40:50 GMT A working screen is not the same as working software. The missing part is everything that happens after the first prompt. https://medium.com/the-syntax-hub/ssl-tls-certificate-renew-story-with-hashicorp-vault-cloudflare-and-lets-encrypt-076730ccbf70?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/076730ccbf70 Wed, 22 Jul 2026 15:18:18 GMT When Certificates Last 47 Days, Manual Renewal Does Not Work Anymore https://medium.com/the-syntax-hub/when-authentication-becomes-a-platform-f42e7e0fcd3a?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/f42e7e0fcd3a Tue, 12 May 2026 13:13:13 GMT Authentication Starts Simple https://medium.com/the-syntax-hub/is-asp-net-core-identity-worthy-take-a-look-at-the-keycloak-approach-9606ca59525c?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/9606ca59525c Fri, 08 May 2026 10:27:37 GMT When a Small Application Starts Growing https://medium.com/the-syntax-hub/redis-distributed-lock-for-idempotent-apis-net-practical-guide-edef67f56210?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/edef67f56210 Sat, 21 Feb 2026 08:01:01 GMT In the previous story, we discussed why idempotency is critical in distributed systems and how duplicate requests can silently break your… https://medium.com/the-syntax-hub/idempotency-in-distributed-systems-net-practical-guide-af22e9d985f1?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/af22e9d985f1 Wed, 18 Feb 2026 13:45:57 GMT I want to create a practical guide for Developers about Idempotency. If your API handles payment order or financial operations check this. https://medium.com/the-syntax-hub/schema-first-prompt-engineering-for-backend-developers-9138197f25b0?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/9138197f25b0 Mon, 16 Feb 2026 08:31:55 GMT Treat LLMs Like Typed APIs, Not Chatbots. https://medium.com/the-syntax-hub/stop-designing-apis-for-humans-design-them-for-llms-7fbfd3dd3f00?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/7fbfd3dd3f00 Fri, 13 Feb 2026 10:59:12 GMT 1. Your Client Is Now a Prediction Engine https://medium.com/the-syntax-hub/stop-writing-stopwatch-code-to-everywhere-here-is-a-story-about-automatic-method-profiling-in-net-7b33b7c8bc36?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/7b33b7c8bc36 Tue, 02 Dec 2025 13:45:10 GMT Let me tell you about a problem I kept running into. You know that moment when your API starts slowing down, and you’re sitting there… https://medium.com/the-syntax-hub/building-more-secure-c-net-applications-with-hashicorp-vault-22c9067b3f8a?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/22c9067b3f8a Fri, 21 Nov 2025 23:36:30 GMT Have you ever found yourself hardcoding database passwords or API keys directly in your `appsettings.json` file? If you’re nodding your… https://medium.com/the-syntax-hub/reduce-llm-token-costs-by-60-with-toon-format-in-c-c3449ee580e3?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/c3449ee580e3 Fri, 14 Nov 2025 13:02:22 GMT If you’re working with Large Language Models (LLMs) like GPT-4 or Claude, you probably know that every token counts — literally. Token… https://medium.com/the-syntax-hub/token-oriented-object-notation-a-more-efficient-data-format-for-llms-5445df4b73e3?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/5445df4b73e3 Fri, 14 Nov 2025 10:41:23 GMT When building applications with Large Language Models (LLMs), token usage is a critical factor for both cost and performance. We pay for… https://medium.com/the-syntax-hub/yaz%C4%B1l%C4%B1m-ekipleri-i%C3%A7in-branch-k%C3%BClt%C3%BCr%C3%BC-86455f98e4a6?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/86455f98e4a6 Thu, 06 Nov 2025 12:06:34 GMT 2015 yılında çalıştığım şirkette sancılı bir TFS -> Git geçişi gerçekleştirmek zorunda kaldım. Aslında bu bir zorunluluk mu yoksa tercih mi… https://medium.com/the-syntax-hub/rulify-net-my-journey-building-a-net-rule-engine-3e4213398fb5?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/3e4213398fb5 Sat, 25 Oct 2025 22:56:01 GMT Hi there! I want to share with you my experience building Rulify.Net, a flexible rule engine for .NET applications. The idea came when I… https://medium.com/the-syntax-hub/simplify-complex-if-else-codes-with-rule-engine-python-bb3f0ce938ce?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/bb3f0ce938ce Fri, 24 Oct 2025 06:10:24 GMT When we write code, this happens to all of us: we start with a simple if-else block, but over time, rules pile up, they get nested, and… https://medium.com/the-syntax-hub/karma%C5%9F%C4%B1k-if-else-kodlar%C4%B1n%C4%B1-rule-engine-ile-basitle%C5%9Ftirin-python-fed2542f5acf?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/fed2542f5acf Thu, 23 Oct 2025 01:06:04 GMT Kod geliştirirken hepimizin başına gelir: basit bir if-else bloğu ile başlarız, ama zamanla kurallar çoğalır, iç içe geçer ve okunamaz bir… https://medium.com/the-syntax-hub/writing-middleware-in-fastapi-a-real-life-example-w3c-logging-facb50a83b32?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/facb50a83b32 Thu, 23 Oct 2025 00:19:22 GMT FastAPI is a modern Python web framework known for its speed and simplicity. But sometimes, just defining routes is not enough — we want… https://medium.com/the-syntax-hub/fastapide-middleware-yazmak-ger%C3%A7ek-hayattan-bir-%C3%B6rnekle-w3c-loglama-20e6f256f7d4?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/20e6f256f7d4 Thu, 23 Oct 2025 00:04:27 GMT FastAPI, hız ve sadelikle öne çıkan modern bir Python web framework’ü. Ama bazen sadece route tanımlamak yetmez — uygulamanın tamamına… https://medium.com/the-syntax-hub/building-esp-music-a-lightweight-music-playback-library-for-your-esp-boards-7101c29f1379?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/7101c29f1379 Fri, 01 Aug 2025 08:47:20 GMT Honestly, this project wasn’t about solving a problem — it was more about having fun while getting my kids interested in electronics and… https://medium.com/the-syntax-hub/chronolap-the-next-generation-stopwatch-for-net-applications-2fb3a6b56e55?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/2fb3a6b56e55 Tue, 01 Jul 2025 13:14:41 GMT In .NET, the Stopwatch class is one of the most commonly used tools for measuring the duration of operations. However, it has a… https://medium.com/the-syntax-hub/chronolap-net-uygulamalar%C4%B1n%C4%B1zda-stopwatcha-yeni-bir-soluk-9c9bfc850fc8?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/9c9bfc850fc8 Mon, 30 Jun 2025 13:58:00 GMT Stopwatch’a Lap (Tur) Takibi Eklemek: Chronolap ile .NET Süre Ölçümleme daha güçlü https://medium.com/the-syntax-hub/ak%C4%B1ll%C4%B1-evler-ve-%C3%BCretken-yapay-zeka-kap%C4%B1daki-bilinmeyeni-anlamak-c4ae2ec22712?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/c4ae2ec22712 Thu, 22 May 2025 11:29:45 GMT Akıllı ev teknolojileri, hayatımızı kolaylaştıran birçok yeniliği beraberinde getiriyor. Ancak bu teknolojileri daha da ileriye taşıyarak… https://ertugrulkra.medium.com/markdown-dosyalar%C4%B1ndan-pdf-dok%C3%BCman-%C3%BCretmek-9be890142550?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/9be890142550 Mon, 22 Jan 2024 14:38:06 GMT Geçenlerde Twitter üzerinde bir yazıda markdown dosyadan PDF üretmek için binlerce dolar isteyen bir kütüphaneden bahsediliyordu. Ne kadar… https://blog.ertugrulkara.com/blog/welcome-to-my-blog https://blog.ertugrulkara.com/blog/welcome-to-my-blog Mon, 15 Jan 2024 00:00:00 GMT An introduction to my personal blog and development journey https://ertugrulkra.medium.com/ef-core-6-i%CC%87le-sql-server-query-hint-with-nolock-2aa26f7be239?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/2aa26f7be239 Tue, 19 Apr 2022 20:26:20 GMT Genellikle yazı yazma durumunu hobi olarak ele alan birisiyim. Ancak bu sefer durum biraz farklı oldu. Çalıştığımız bir proje için SQL… https://ertugrulkra.medium.com/eski-winform-uygulamalarda-dependency-container-kullan%C4%B1m%C4%B1-f13a73f39a08?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/f13a73f39a08 Mon, 11 Oct 2021 23:02:30 GMT Merhaba, https://ertugrulkra.medium.com/aile-e%C4%9Flencesi-2-siriyi-konu%C5%9Fturmak-python-pyttsx3-flask-8ac0561a3343?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/8ac0561a3343 Fri, 29 Jan 2021 18:52:19 GMT Merhaba, https://ertugrulkra.medium.com/aile-e%C4%9Flencesi-1-hareket-sens%C3%B6r%C3%BC-yap%C4%B1m%C4%B1-python-opencv-a80e89a9e065?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/a80e89a9e065 Tue, 26 Jan 2021 21:31:40 GMT Öncelikle herkese merhaba. Bir .net developer olarak python merakımı her geçen gün biraz daha cezbediyor ve bazen meraktan biraz daha… https://medium.com/the-syntax-hub/xml-belgelerinde-mant%C4%B1ksal-kontrol-net-i%CC%87le-schematron-34198b51872c?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/34198b51872c Tue, 04 Feb 2020 15:51:27 GMT Merhaba, https://ertugrulkra.medium.com/xml-belgelerinde-mant%C4%B1ksal-kontrol-python-i%CC%87le-schematron-e97a44349e32?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/e97a44349e32 Thu, 23 Jan 2020 23:28:38 GMT Merhabalar, https://ertugrulkra.medium.com/xml-belgelerinde-mant%C4%B1ksal-kontrol-java-i%CC%87le-schematron-1b158f3f347a?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/1b158f3f347a Mon, 20 Jan 2020 07:51:09 GMT Merhabalar, https://ertugrulkra.medium.com/xml-belgelerinde-mant%C4%B1ksal-kontrol-schematron-ebbdbf196c16?utm_source=blog&utm_medium=referral&utm_campaign=blog_summary https://medium.com/p/ebbdbf196c16 Thu, 09 Jan 2020 20:18:16 GMT XML Schematron, XML Schema, Saxon