Senior backend engineer with 6+ years of production Node.js / TypeScript experience, focused on shipping LLM-powered features end-to-end.https://rezaenayati.me/enhttps://rezaenayati.me/case-studies/shipping-llm-features/https://rezaenayati.me/case-studies/shipping-llm-features/Notes from building a multi-language summarization pipeline on Azure OpenAI: provider abstraction, multi-region failover, structured outputs, function calling, and the cost telemetry that kept us honest.Sat, 25 Apr 2026 00:00:00 GMTcase studyAILLMAzure OpenAIBackendhttps://rezaenayati.me/case-studies/mongo-incident-2026/https://rezaenayati.me/case-studies/mongo-incident-2026/A B2B SaaS I work on saw router pools saturate and p95 pin at 30 seconds. The trigger was one query on one collection. The amplifiers were everywhere. This is the walkthrough.Tue, 21 Apr 2026 00:00:00 GMTcase studyMongoDBPerformancePostmortemBackendhttps://rezaenayati.me/articles/reading-explain-plans-without-panicking/https://rezaenayati.me/articles/reading-explain-plans-without-panicking/MongoDB explain plans look intimidating because the field names sound like ceremonial Latin. They aren't, and they don't have to be. Three numbers and one stage name will tell you 80% of what you need to know about a slow query.Wed, 22 Oct 2025 00:00:00 GMTwritingMongoDBPerformanceBackendhttps://rezaenayati.me/articles/clean-architecture-costs/https://rezaenayati.me/articles/clean-architecture-costs/Clean architecture is a real win in some codebases and a real cost in others. The costs are not theoretical and they're not optional. If you can name the specific thing the architecture is buying you, it's probably worth the price. If you can't, it isn't.Tue, 15 Jul 2025 00:00:00 GMTwritingArchitectureBackendOpinion